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Organism
  Animalia
      Arthropoda
             [Invertebrate]
            Insecta
                    Coleoptera
                          Hydrophiloidea
                            Hydrophilidae
                                     Ametor
                                             Ametor latus
                                             Ametor scabrosus
                                     Anacaena
                                             Anacaena debilis
                                             Anacaena limbata
                                             Anacaena signaticollis
                                             Anacaena suturalis
                                     Berosus
                                             Berosus aculeatus
                                             Berosus arnetti
                                             Berosus corrini
                                             Berosus exiguus
                                             Berosus fraternus
                                             Berosus hatchi
                                             Berosus infuscatus
                                             Berosus ingeminatus
                                             Berosus maculosus
                                             Berosus metalliceps
                                             Berosus miles
                                             Berosus notapeltatus
                                             Berosus ordinatus
                                             Berosus oregonensis
                                             Berosus pantherinus
                                             Berosus peregrinus
                                             Berosus pugnax
                                             Berosus punctatissimus
                                             Berosus rugulosus
                                             Berosus sayi
                                                   [Berosus striatus]
                                             Berosus stylifer
                                                   [Berosus styliferus]
                                             Berosus youngi
                                     Cercyon
                                       Cercyon (Cercyon)
                                             Cercyon adumbratus
                                             Cercyon aequatus
                                             Cercyon analis
                                             Cercyon arizonicus
                                             Cercyon assecla
                                             Cercyon cinctus
                                             Cercyon connivens
                                             Cercyon convexiusculus
                                             Cercyon crocatus
                                             Cercyon depressus
                                             Cercyon erraticus
                                             Cercyon fimbriatus
                                             Cercyon floridanus
                                             Cercyon granarius
                                             Cercyon haemorrhoidalis
                                             Cercyon herceus
                                             Cercyon impressus
                                             Cercyon indistinctus
                                             Cercyon integer
                                             Cercyon kulzeri
                                             Cercyon laminatus
                                             Cercyon lateralis
                                             Cercyon limbatus
                                             Cercyon littoralis
                                             Cercyon luniger
                                             Cercyon marinus
                                             Cercyon matthewsi
                                             Cercyon melanocephalus
                                             Cercyon mellipes
                                             Cercyon mendax
                                             Cercyon mexicanus
                                             Cercyon miniusculus
                                             Cercyon nevadanus
                                             Cercyon nigriceps
                                             Cercyon ocallatus
                                             Cercyon praetextatus
                                             Cercyon pygmaeus
                                             Cercyon quisquilius
                                             Cercyon roseni
                                             Cercyon spathifer
                                             Cercyon terminatus
                                             Cercyon tolfino
                                             Cercyon tristis
                                             Cercyon unipunctatus
                                             Cercyon ustulatus
                                             Cercyon variegatus
                                             Cercyon versicolor
                                     Chaetarthria
                                             Chaetarthria atra
                                             Chaetarthria atroides
                                             Chaetarthria bicolor
                                             Chaetarthria hespera
                                             Chaetarthria leechi
                                             Chaetarthria magna
                                             Chaetarthria nigrella
                                             Chaetarthria ochra
                                             Chaetarthria pallida
                                             Chaetarthria punctulata
                                             Chaetarthria pusilla
                                             Chaetarthria spinata
                                             Chaetarthria truncata
                                     Crenitis
                                             Crenitis alticola
                                             Crenitis digesta
                                             Crenitis dissimilis
                                             Crenitis longula
                                             Crenitis maculifrons
                                             Crenitis malkini
                                             Crenitis morata
                                             Crenitis palpalis
                                             Crenitis paradigma
                                             Crenitis rufiventris
                                                   [Crenitis seriellus]
                                             Crenitis snoqualmie
                                     Cryptopleurum
                                             Cryptopleurum americanum
                                             Cryptopleurum crenatum
                                             Cryptopleurum evansi
                                             Cryptopleurum impressum
                                             Cryptopleurum minutum
                                             Cryptopleurum subtile
                                             Cryptopleurum vagans
                                     Cymbiodyta
                                             Cymbiodyta acuminata
                                             Cymbiodyta arizonica
                                             Cymbiodyta beckeri
                                             Cymbiodyta blanchardi
                                             Cymbiodyta brevicollis
                                             Cymbiodyta chamberlaini
                                             Cymbiodyta columbiana
                                             Cymbiodyta dorsalis
                                             Cymbiodyta enumera
                                             Cymbiodyta fraterculus
                                             Cymbiodyta howdeni
                                             Cymbiodyta imbellis
                                             Cymbiodyta leechi
                                             Cymbiodyta minima
                                             Cymbiodyta occidentalis
                                             Cymbiodyta pacifica
                                             Cymbiodyta polita
                                             Cymbiodyta pseudopacifica
                                             Cymbiodyta puella
                                             Cymbiodyta punctatostriata
                                             Cymbiodyta rotunda
                                             Cymbiodyta semistriata
                                             Cymbiodyta seriata
                                             Cymbiodyta toddi
                                             Cymbiodyta vindicata
                                     Deltostethus
                                             Deltostethus columbiensis
                                     Derallus
                                             Derallus altus
                                     Dibolocelus
                                     Enochrus
                                             Enochrus aridus
                                             Enochrus blatchleyi
                                             Enochrus californicus
                                             Enochrus carinatus
                                             Enochrus cinctus
                                             Enochrus consors
                                             Enochrus consortus
                                             Enochrus cristatus
                                             Enochrus cuspidatus
                                             Enochrus diffusus
                                             Enochrus fimbriatus
                                                   [Enochrus perplexus]
                                             Enochrus grossi
                                             Enochrus hamiltoni
                                             Enochrus interruptus
                                             Enochrus mexicanus
                                             Enochrus ochraceus
                                             Enochrus piceus
                                               Enochrus piceus glabrus
                                             Enochrus pygmaeus
                                               Enochrus pygmaeus nebulosus
                                             Enochrus reflexipennis
                                             Enochrus sayi
                                             Enochrus sublongus
                                     Helobata
                                             Helobata larvalis
                                     Helochares
                                             Helochares maculicollis
                                             Helochares normatus
                                             Helochares sallaei
                                     Helocombus
                                             Helocombus bifidus
                                     Hydrobiomorpha
                                             Hydrobiomorpha casta
                                                   [Hydrobiomorpha castus]
                                     Hydrobius
                                             Hydrobius fuscipes
                                             Hydrobius melaenus
                                     Hydrochara
                                             Hydrochara brevipalpis
                                             Hydrochara leechi
                                             Hydrochara lineata
                                             Hydrochara obtusata
                                             Hydrochara occulta
                                             Hydrochara rickseckeri
                                             Hydrochara simula
                                             Hydrochara soror
                                             Hydrochara spangleri
                              Hydrophilinae
                                Hydrophilini
                                     Hydrophilus
                                       Hydrophilus (Dibolocelus)
                                             Hydrophilus insularis
                                             Hydrophilus ovatus
                                             Hydrophilus triangularis
                                     Laccobius
                                             Laccobius agilis
                                             Laccobius borealis
                                             Laccobius californicus
                                             Laccobius carri
                                             Laccobius cinereus
                                               Laccobius cinereus columbianus
                                             Laccobius ellipticus
                                             Laccobius hardyi
                                             Laccobius insolitus
                                             Laccobius mexicanus
                                             Laccobius minutoides
                                             Laccobius nevadensis
                                               Laccobius nevadensis magnus
                                                     [Laccobius magnus]
                                             Laccobius reflexipenis
                                             Laccobius spangleri
                                             Laccobius teneralis
                                             Laccobius truncatipennis
                                     Limnohydrobius
                                             Limnohydrobius tumidus
                                                   [Hydrobius tumidus]
                                     Limnoxenus
                                             Limnoxenus semicylindricus
                                     Megasternum
                                             Megasternum obscurum
                                             Megasternum posticatum
                                     Oosternum
                                             Oosternum costatum
                                             Oosternum pubescens
                                             Oosternum sharpi
                                     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
                                     Phaenonotum
                                             Phaenonotum exstriatum
                                             Phaenonotum minus
                                     Sperchopsis
                                             Sperchopsis tessellata
                                                   [Sperchopsis tessellatus]
                              Sphaeridiinae
                                Megasternini
                                  Megasternina
                                     Sphaeridium
                                             Sphaeridium bipustulatum
                                             Sphaeridium lunatum
                                             Sphaeridium scarabaeoides
                                     Tectosternum
                                             Tectosternum naviculare
                                     Tropisternus
                                             Tropisternus affinis
                                                   [Tropisternus ellipticus]
                                             Tropisternus blatchleyi
                                             Tropisternus californicus
                                             Tropisternus collaris
                                               Tropisternus collaris mexicanus
                                               Tropisternus collaris striolatus
                                             Tropisternus columbianus
                                             Tropisternus glaber
                                             Tropisternus lateralis
                                               Tropisternus lateralis limbalis
                                               Tropisternus lateralis nimbatus
                                             Tropisternus mixtus
                                             Tropisternus natator
                                             Tropisternus obscurus
                                             Tropisternus orvus
                                             Tropisternus quadristriatus
                                             Tropisternus salsamentus
                                             Tropisternus sublaevis