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| | Kingdom | Animalia
– Animal, animaux, animals |
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| | Subkingdom | Bilateria
– triploblasts |
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| | Infrakingdom | Protostomia
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| | Superphylum | Ecdysozoa
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| | Phylum | Arthropoda
– Artrópode, arthropodes, arthropods |
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| | Subphylum | Crustacea Brünnich, 1772
– crustacés, crustáceo, crustaceans |
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| | Superclass | Altocrustacea
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| | Class | Malacostraca Latreille, 1802
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| | Subclass | Eumalacostraca Grobben, 1892
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| | Superorder | Peracarida Calman, 1904
– barata da praia, pulga da praia, tatuzinho de jardim |
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| | Order | Amphipoda Latreille, 1816
– amphipods, amphipodes |
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| | Suborder | Senticaudata Lowry & Myers, 2013
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| | Infraorder | Gammarida
– gammarid amphipods |
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| | Superfamily | Crangonyctoidea Bousfield, 1973
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| | Family | Crangonyctidae Bousfield, 1973
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| | Genus | Crangonyx Bate, 1859 |
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Direct Children: |
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| | Species | Crangonyx abberraus D. G. Smith, 1983
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| | Species | Crangonyx aberrans D. Smith, 1983
– aberrant crangonyctid | |
| | Species | Crangonyx acicularis Zhang and Holsinger, 2003
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| | Species | Crangonyx aka Zhang and Holsinger, 2003
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| | Species | Crangonyx alpinus Bousfield, 1963
– alpine lake crangonyctid | |
| | Species | Crangonyx anomalus Hubricht, 1943
– large male crangonyctid, Anomalous spring amphipod | |
| | Species | Crangonyx antennatus Cope and Packard, 1881
– Appalachian Valley crangonyctid, Appalachian Valley cave amphipod | |
| | Species | Crangonyx arsenjevi (Derzhavin, 1927)
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| | Species | Crangonyx baculispina Zhang and Holsinger, 2003
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| | Species | Crangonyx barri Zhang and Holsinger, 2003
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| | Species | Crangonyx bousfieldi Zhang and Holsinger, 2003
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| | Species | Crangonyx caecus Zhang and Holsinger, 2003
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| | Species | Crangonyx castellanum Zhang and Holsinger, 2003
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| | Species | Crangonyx chlebnikovi Borutsky, 1928
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| | Species | Crangonyx consimilis Zhang and Holsinger, 2003
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| | Species | Crangonyx cooperi Zhang and Holsinger, 2003
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| | Species | Crangonyx cornutus Zhang and Holsinger, 2003
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| | Species | Crangonyx dearolfi Shoemaker, 1942
– Pennsylvania cave crangonyctid, Dearolf's cave amphipod | |
| | Species | Crangonyx disjunctus Zhang and Holsinger, 2003
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| | Species | Crangonyx floridanus Bousfield, 1963
– Florida crangonyctid | |
| | Species | Crangonyx fontinalis Zhang and Holsinger, 2003
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| | Species | Crangonyx forbesi (Hubricht and Mackin, 1940)
– Forbes crangonyctid | |
| | Species | Crangonyx gracilis S. I. Smith, 1871
– northern lake crangonyctid | |
| | Species | Crangonyx grandimanus Bousfield, 1963
– Florida cave crangonyctid | |
| | Species | Crangonyx hobbsi Shoemaker, 1941
– Hobbs cave crangonyctid, Hobb's cave amphipod | |
| | Species | Crangonyx hubrichti Zhang and Holsinger, 2003
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| | Species | Crangonyx indianensis Zhang and Holsinger, 2003
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| | Species | Crangonyx insolitus Zhang and Holsinger, 2003
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| | Species | Crangonyx lewisi Zhang and Holsinger, 2003
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| | Species | Crangonyx longicarpus Zhang and Holsinger, 2003
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| | Species | Crangonyx longidactylus Zhang and Holsinger, 2003
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| | Species | Crangonyx minor Bousfield, 1958
– small stream crangonyctid, Minor cave amphipod | |
| | Species | Crangonyx montanus Zhang and Holsinger, 2003
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| | Species | Crangonyx obliquus (Hubricht and Mackin, 1940)
– oblique-hand crangonyctid | |
| | Species | Crangonyx occidentalis Hubricht and Harrison, 1941
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| | Species | Crangonyx ohioensis Zhang and Holsinger, 2003
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| | Species | Crangonyx orientalis Zhang and Holsinger, 2003
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| | Species | Crangonyx packardi S. I. Smith, 1888
– Packard cave crangonyctid, Packard's cave amphipod | |
| | Species | Crangonyx palustris Zhang and Holsinger, 2003
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| | Species | Crangonyx paxi Schellenberg, 1935
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| | Species | Crangonyx pseudogracilis Bousfield, 1958
– northern river crangonyctid | |
| | Species | Crangonyx richmondensis Ellis, 1940
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| | Species | Crangonyx rivularis Bousfield, 1958
– Ontario stream crangonyctid | |
| | Species | Crangonyx serratus (Embody, 1911)
– serrate crangonyctid | |
| | Species | Crangonyx setodactylus Bousfield, 1958
– hairy-fingered crangonyctid | |
| | Species | Crangonyx shoemakeri (Hubricht and Mackin, 1940)
– Shoemaker crangonyctid | |
| | Species | Crangonyx specus Zhang and Holsinger, 2003
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| | Species | Crangonyx stagnicolous Zhang and Holsinger, 2003
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| | Species | Crangonyx subterraneus Bate, 1858
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