Central Taxonomic Thesaurus
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  Animalia
      Arthropoda
        Hexapoda
               [Apterygota]
            Insecta
              Pterygota
                Neoptera
                       [Endopterygota]
                       [Exopterygota]
                    Coleoptera
                      Polyphaga
                        Staphyliniformia
                          Hydrophiloidea
                            Hydrophilidae
                              Horelophinae
                                     Horelophus
                                             Horelophus walkeri
                              Horelophopsinae
                                     Horelophopsis
                                             Horelophopsis avita
                              Hydrophilinae
                                Anacaenini
                                     Anacaena
                                           [Crenitulus]
                                           [Cryniphilus]
                                             Anacaena bipustulata
                                                   [Anacaena bipustulatus]
                                             Anacaena debilis
                                                   [Paracymus debilis]
                                             Anacaena globulus
                                             Anacaena limbata
                                                   [Anacaena infuscatus]
                                             Anacaena lutescens
                                             Anacaena parvula
                                             Anacaena perpenna
                                             Anacaena signaticollis
                                             Anacaena sternalis
                                             Anacaena suturalis
                                                   [Crenitis suturalis]
                                                   [Paracymus suturalis]
                                     Crenitis
                                       Crenitis (Crenitis)
                                             Crenitis alticola
                                                   [Paracymus alticola]
                                             Crenitis digesta
                                                   [Crenitis digestus]
                                                   [Paracymus digestus]
                                             Crenitis dissimilis
                                             Crenitis longula
                                                   [Crenitis longulus]
                                                   [Paracymus longulus]
                                             Crenitis maculifrons
                                             Crenitis malkini
                                             Crenitis monticola
                                             Crenitis morata
                                             Crenitis palpalis
                                             Crenitis paradigma
                                                   [Anacaena paracymoides]
                                                   [Anacaena paradigma]
                                                   [Crenophilus paracymoides]
                                             Crenitis rufiventris
                                                   [Crenitis seriellus]
                                                   [Paracymus rufiventris]
                                                   [Paracymus seriellus]
                                             Crenitis snoqualmie
                                     Paracymus
                                             Paracymus armatus
                                             Paracymus communis
                                             Paracymus confluens
                                             Paracymus confusus
                                             Paracymus degener
                                             Paracymus despectus
                                             Paracymus dispersus
                                             Paracymus elegans
                                             Paracymus ellipsis
                                             Paracymus lodingi
                                             Paracymus nanus
                                             Paracymus reductus
                                             Paracymus restrictus
                                             Paracymus seclusus
                                             Paracymus subcupreus
                                             Paracymus tarsalis
                                Berosini
                                     Berosus
                                           [Enoplurus]
                                       Berosus (Berosus)
                                             Berosus aculeatus
                                             Berosus arnetti
                                             Berosus blechrus
                                             Berosus corrini
                                             Berosus dolerosus
                                             Berosus exiguus
                                             Berosus fraternus
                                                   [Berosus californicus]
                                             Berosus hatchi
                                             Berosus infuscatus
                                             Berosus ingeminatus
                                             Berosus interstilialis
                                             Berosus metalliceps
                                                   [Berosus metallicus]
                                             Berosus moerens
                                             Berosus notapeltatus
                                             Berosus ordinatus
                                                   [Berosus pennsylvanicus]
                                             Berosus oregonensis
                                             Berosus pantherinus
                                             Berosus peregrinus
                                                   [Berosus immaculatus]
                                                   [Berosus subsignatus]
                                             Berosus rugulosus
                                             Berosus sayi
                                                   [Berosus striatus]
                                             Berosus stribalus
                                             Berosus stylifer
                                                   [Berosus styliferus]
                                             Berosus youngi
                                       Berosus (Enoplurus)
                                             Berosus hoplites
                                             Berosus maculosus
                                             Berosus miles
                                             Berosus pugnax
                                             Berosus punctatissimus
                                             Berosus salvini
                                             Berosus undatus
                                     Derallus
                                             Derallus altus
                                             Derallus angustus
                                             Derallus rudis
                                     Hemiosus
                                             Hemiosus exilis
                                                   [Berosus exilis]
                                Chaetarthriini
                                     Chaetarthria
                                           [Cyllidium]
                                             Chaetarthria atra
                                             Chaetarthria atroides
                                             Chaetarthria bicolor
                                                   [Chaetarthria bicolor mexicana]
                                                   [Chaetarthria mexicana]
                                             Chaetarthria glabra
                                             Chaetarthria hespera
                                             Chaetarthria laeticula
                                             Chaetarthria leechi
                                             Chaetarthria magna
                                             Chaetarthria nigrella
                                             Chaetarthria ochra
                                             Chaetarthria pallida
                                             Chaetarthria punctulata
                                             Chaetarthria pusilla
                                                   [Chaetarthria minor]
                                             Chaetarthria spinata
                                             Chaetarthria truncata
                                             Chaetarthria utahensis
                                Hydrophilini
                                     Chasmogenus
                                             Chasmogenus sapucay
                                     Cymbiodyta
                                             Cymbiodyta acuminata
                                             Cymbiodyta arizonica
                                             Cymbiodyta beckeri
                                               Cymbiodyta beckeri beckeri
                                               Cymbiodyta beckeri picta
                                             Cymbiodyta blanchardi
                                             Cymbiodyta brevicollis
                                             Cymbiodyta chamberlaini
                                             Cymbiodyta columbiana
                                             Cymbiodyta dorsalis
                                                   [Cymbiodyta morata]
                                             Cymbiodyta enumera
                                             Cymbiodyta fraterculus
                                             Cymbiodyta howdeni
                                             Cymbiodyta imbellis
                                             Cymbiodyta leechi
                                             Cymbiodyta minima
                                             Cymbiodyta occidentalis
                                             Cymbiodyta pacifica
                                                   [Cymbiodyta hatchi]
                                             Cymbiodyta polita
                                             Cymbiodyta pseudopacifica
                                             Cymbiodyta puella
                                             Cymbiodyta punctatostriata
                                                   [Cymbiodyta punctatostriatus]
                                             Cymbiodyta rotunda
                                             Cymbiodyta semistriata
                                             Cymbiodyta seriata
                                             Cymbiodyta toddi
                                             Cymbiodyta vindicata
                                     Enochrus
                                           [Philhydrus]
                                       Enochrus (Enochrus)
                                             Enochrus carinatus
                                               Enochrus carinatus carinatus
                                               Enochrus carinatus fucatus
                                                     [Enochrus discedens]
                                                     [Enochrus fucatus]
                                             Enochrus cuspidatus
                                             Enochrus melanocephalus
                                             Enochrus mexicanus
                                             Enochrus piceus
                                               Enochrus piceus glabrus
                                               Enochrus piceus piceus
                                       Enochrus (Hugoscottia)
                                             [Hugoscottia]
                                             Enochrus darwini
                                       Enochrus (Lumetus)
                                             [Lumetus]
                                             Enochrus diffusus
                                             Enochrus hamiltoni
                                                   [Enochrus collinus]
                                                   [Enochrus conjunctus]
                                                   [Enochrus hamiltoni hamiltoni]
                                                   [Enochrus hamiltoni pacificus]
                                                   [Enochrus hamiltoni pyretus]
                                                   [Enochrus horni]
                                             Enochrus reflexipennis
                                             Enochrus sagrae
                                       Enochrus (Methydrus)
                                             [Methydrus]
                                             Enochrus aequalis
                                             Enochrus aridus
                                             Enochrus blatchleyi
                                             Enochrus californicus
                                             Enochrus cinctus
                                             Enochrus consors
                                             Enochrus consortus
                                             Enochrus cristatus
                                                   [Enochrus nigellus]
                                                   [Enochrus nigrellus]
                                                   [Enochrus obtusiusculus]
                                             Enochrus debilis
                                             Enochrus fimbriatus
                                                   [Cymbiodyta fimbriata]
                                                   [Enochrus perplexus]
                                             Enochrus grossi
                                             Enochrus interruptus
                                             Enochrus negrus
                                             Enochrus obscurus
                                             Enochrus ochraceus
                                             Enochrus pygmaeus
                                               Enochrus pygmaeus nebulosus
                                               Enochrus pygmaeus pectoralis
                                                     [Enochrus pectoralis]
                                               Enochrus pygmaeus pygmaeus
                                             Enochrus sayi
                                             Enochrus sublongus
                                                   [Enochrus curialis]
                                     Helobata
                                           [Helopeltina]
                                           [Helopeltis]
                                             Helobata larvalis
                                                   [Helobata striata]
                                     Helochares
                                           [Hydrocombus]
                                       Helochares (Helochares)
                                             Helochares abbreviatus
                                                   [Helochares abbreviata]
                                                   [Helochares rufobrunneus]
                                             Helochares maculicollis
                                                   [Helochares bipunctatus]
                                             Helochares normatus
                                                   [Enochrus normatus]
                                                   [Helochares regularis]
                                                   [Helochares seriatus]
                                             Helochares sallaei
                                       Helochares (Sindolus)
                                             [Sindolus]
                                             Helochares mundus
                                     Helocombus
                                             Helocombus bifidus
                                     Hydramara
                                             Hydramara argentina
                                     Hydrobiomorpha
                                           [Neohydrophilus]
                                       Hydrobiomorpha (Hydrobiomorpha)
                                             Hydrobiomorpha casta
                                                   [Hydrobiomorpha castus]
                                             Hydrobiomorpha medius
                                             Hydrobiomorpha phallica
                                     Hydrobius
                                             Hydrobius fuscipes
                                             Hydrobius melaenus
                                                   [Hydrobius globosus]
                                             Hydrobius tumidus
                                     Hydrochara
                                           [Hydrocharis]
                                             Hydrochara brevipalpis
                                             Hydrochara grandis
                                             Hydrochara leechi
                                             Hydrochara lineata
                                             Hydrochara obtusata
                                             Hydrochara occulta
                                                   [Hydrophilus occultus]
                                             Hydrochara rickseckeri
                                             Hydrochara simula
                                             Hydrochara soror
                                             Hydrochara spangleri
                                     Hydrophilus
                                       Hydrophilus (Dibolocelus)
                                             [Dibolocelus]
                                             Hydrophilus ovatus
                                                   [Dibolocelus ovatus]
                                       Hydrophilus (Hydrophilus)
                                             Hydrophilus insularis
                                             Hydrophilus triangularis
                                             Hydrophilus ater
                                     Limnoxenus
                                             Limnoxenus nesiticus
                                             Limnoxenus semicylindricus
                                     Tropisternus
                                           [Cyphostethus]
                                       Tropisternus (Homostethus)
                                             [Homostethus]
                                             Tropisternus cordieri
                                       Tropisternus (Pleurhomus)
                                             [Pleurhomus]
                                             Tropisternus sahlbergi
                                       Tropisternus (Pristoternus)
                                             [Pristoternus]
                                             Tropisternus apicipalpis
                                             Tropisternus chalybeus
                                             Tropisternus crassus
                                             Tropisternus laevis
                                             Tropisternus mergus
                                       Tropisternus (Strepitornus)
                                             Tropisternus collaris
                                               Tropisternus collaris collaris
                                               Tropisternus collaris mexicanus
                                               Tropisternus collaris proximus
                                               Tropisternus collaris striolatus
                                                     [Tropisternus striolatus]
                                               Tropisternus collaris viridis
                                             Tropisternus niger
                                       Tropisternus (Tropisternus)
                                             Tropisternus affinis
                                                   [Tropisternus ellipticus]
                                             Tropisternus blatchleyi
                                               Tropisternus blatchleyi blatchleyi
                                               Tropisternus blatchleyi modestus
                                                     [Tropisternus modestus]
                                             Tropisternus californicus
                                             Tropisternus columbianus
                                             Tropisternus glaber
                                             Tropisternus lateralis
                                               Tropisternus lateralis humeralis
                                               Tropisternus lateralis lateralis
                                               Tropisternus lateralis limbalis
                                                     [Tropisternus binotatus]
                                                     [Tropisternus lateralis binotatus]
                                               Tropisternus lateralis limbatus
                                                     [Tropisternus dorsalis]
                                               Tropisternus lateralis nimbatus
                                             Tropisternus mixtus
                                             Tropisternus natator
                                             Tropisternus obscurus
                                             Tropisternus orvus
                                             Tropisternus quadristriatus
                                             Tropisternus salsamentus
                                             Tropisternus sublaevis
                                                   [Tropisternus xanthopus]
                                Laccobiini
                                     Laccobius
                                       Laccobius (Hydroxenus)
                                             Laccobius borealis
                                                   [Laccobius chandleri]
                                             Laccobius californicus
                                             Laccobius ellipticus
                                             Laccobius mexicanus
                                             Laccobius oregonensis
                                       Laccobius (Laccobius)
                                             Laccobius agilis
                                                   [Laccobius acutipennis]
                                                   [Laccobius punctatus]
                                             Laccobius arenarius
                                             Laccobius bruesi
                                             Laccobius carri
                                                   [Laccobius pacificus]
                                             Laccobius cinereus
                                               Laccobius cinereus cinereus
                                               Laccobius cinereus columbianus
                                                     [Laccobius columbianus]
                                             Laccobius fuscipunctatus
                                             Laccobius hardyi
                                             Laccobius minutoides
                                             Laccobius nevadensis
                                               Laccobius nevadensis magnus
                                                     [Laccobius magnus]
                                               Laccobius nevadensis nevadensis
                                             Laccobius occidentalis
                                             Laccobius piceus
                                               Laccobius piceus chearyi
                                                     [Laccobius australis]
                                               Laccobius piceus piceus
                                             Laccobius reflexipenis
                                             Laccobius spangleri
                                             Laccobius teneralis
                                             Laccobius truncatipennis
                                       Laccobius (Microlaccobius)
                                             Laccobius gracilis
                                               Laccobius gracilis gracilis
                                               Laccobius gracilis sellae
                                                     [Enochrus sellae]
                                                     [Laccobius sellae]
                                             Laccobius hintoni
                                             Laccobius insolitus
                                             Laccobius leechi
                                     Oocyclus
                                             Oocyclus vestitus
                                Sperchopsini
                                     Ametor
                                             Ametor latus
                                                   [Hydrobius latus]
                                             Ametor scabrosus
                                                   [Hydrobius scabrosus]
                                     Hydrocassis
                                           [Hydrocyclus]
                                             Hydrocassis scapulata
                                     Sperchopsis
                                             Sperchopsis tessellata
                                                   [Sperchopsis tessellatus]
                              Sphaeridiinae
                                Coelostomatini
                                     Coelofletium
                                             Coelofletium exstriatum
                                     Coelostoma
                                             Coelostoma fabricii
                                     Cyclotypus
                                             Cyclotypus godmani
                                             Cyclotypus latissimus
                                     Dactylosternum
                                             Dactylosternum abdominale
                                             Dactylosternum advectum
                                             Dactylosternum cacti
                                                   [Dactylosternum unistriatum]
                                             Dactylosternum cycloides
                                             Dactylosternum dispar
                                             Dactylosternum dytiscoides
                                             Dactylosternum flavicorne
                                             Dactylosternum hydrophiloides
                                             Dactylosternum picicorne
                                             Dactylosternum subdepressum
                                               Dactylosternum subdepressum striatopunctatum
                                                     [Dactylosternum striatopunctatum]
                                               Dactylosternum subdepressum subdepressum
                                             Dactylosternum subquadratum
                                     Phaenonotum
                                             Phaenonotum apicale
                                             Phaenonotum exstriatum
                                                   [Phaenonotum dubium]
                                                   [Phaenonotum estriatum]
                                                   [Phaenonotum semiglobosum]
                                             Phaenonotum globulosum
                                                   [Phaenonotum laevicolle]
                                             Phaenonotum minus
                                                   [Phaenonotum minor]
                                             Phaenonotum rotundulum
                                     Phaenostoma
                                             Phaenostoma posticatum
                                Megasternini
                                     Agna
                                             Agna capillata
                                                   [Pelosoma capillatum]
                                             Agna rufescens
                                                   [Pelosoma rufescens]
                                     Cercyon
                                       Cercyon (Cercyon)
                                             Cercyon adumbratus
                                                   [Cryptopleurum unicolor]
                                             Cercyon aequatus
                                             Cercyon arizonicus
                                             Cercyon assecla
                                             Cercyon cinctus
                                             Cercyon connivens
                                             Cercyon convexiusculus
                                             Cercyon depressus
                                             Cercyon erraticus
                                             Cercyon fimbriatus
                                             Cercyon floridanus
                                             Cercyon granarius
                                             Cercyon haemorrhoidalis
                                                   [Cercyon basillaris]
                                             Cercyon herceus
                                               Cercyon herceus frigidus
                                               Cercyon herceus herceus
                                             Cercyon impressus
                                             Cercyon indistinctus
                                             Cercyon integer
                                             Cercyon kulzeri
                                             Cercyon lateralis
                                                   [Cercyon incrematus]
                                             Cercyon limbatus
                                                   [Cercyon fulvipenne]
                                             Cercyon littoralis
                                             Cercyon luniger
                                             Cercyon marinus
                                             Cercyon matthewsi
                                             Cercyon melanocephalus
                                             Cercyon mellipes
                                             Cercyon mendax
                                             Cercyon mexicanus
                                             Cercyon nevadanus
                                             Cercyon nigriceps
                                                   [Cercyon atricapillus]
                                             Cercyon ocallatus
                                             Cercyon praetextatus
                                                   [Cercyon testaceum]
                                             Cercyon pygmaeus
                                             Cercyon quisquilius
                                             Cercyon spathifer
                                             Cercyon terminatus
                                                   [Cercyon nanum]
                                                   [Cercyon nanus]
                                             Cercyon tolfino
                                             Cercyon tristis
                                             Cercyon unipunctatus
                                             Cercyon variegatus
                                             Cercyon versicolor
                                       Cercyon (Dicytocercyon)
                                             Cercyon ustulatus
                                       Cercyon (Paracycreon)
                                             Cercyon analis
                                                   [Cercyon falli]
                                                   [Cercyon maculatum]
                                                   [Cercyon maculatus]
                                             Cercyon crocatus
                                             Cercyon laminatus
                                             Cercyon miniusculus
                                       Cercyon (Prostercyon)
                                             Cercyon roseni
                                                   [Cercyon opacellus]
                                     Cryptopleurum
                                             Cryptopleurum americanum
                                             Cryptopleurum crenatum
                                             Cryptopleurum evansi
                                             Cryptopleurum impressum
                                             Cryptopleurum minutum
                                             Cryptopleurum subtile
                                             Cryptopleurum vagans
                                     Cycrillum
                                             Cycrillum strigicolle
                                     Deltostethus
                                             Deltostethus columbiensis
                                                   [Pelosoma columbiensis]
                                             Deltostethus palpalis
                                     Megasternum
                                             Megasternum concinnum
                                                   [Megasternum boletophagum]
                                             Megasternum posticatum
                                                   [Megasternum pugetense]
                                             Megasternum punctulatum
                                     Oosternum
                                           [Pemelus]
                                             Oosternum attacomis
                                                   [Genyon attacomis]
                                             Oosternum costatum
                                                   [Pemelus costatus]
                                             Oosternum pubescens
                                                   [Cercyon pubescens]
                                             Oosternum sharpi
                                     Paraoosternum
                                             Paraoosternum sorex
                                     Pelosoma
                                             Pelosoma mesosternalum
                                             Pelosoma ovulum
                                             Pelosoma pecki
                                             Pelosoma prosternale
                                                   [Pelosoma praecursor]
                                     Tectosternum
                                           [Genyon]
                                             Tectosternum naviculare
                                                   [Cercyon navicularis]
                                                   [Genyon navicularis]
                                Omicrini
                                     Heteryon
                                             Heteryon depressus
                                     Nitiduloides
                                             Nitiduloides jansoni
                                     Noteropagus
                                             Noteropagus obliquus
                                     Omicrus
                                           [Phaenotypus]
                                             Omicrus brevipes
                                             Omicrus globulus
                                             Omicrus palmarum
                                                   [Phaenotypus palmarum]
                                Sphaeridiini
                                     Sphaeridium
                                           [Sphaeridiolinus]
                                             Sphaeridium bipustulatum
                                             Sphaeridium lunatum
                                             Sphaeridium marginatum
                                             Sphaeridium scarabaeoides