''Branchioplax'' is an extinct genus of

crab Crabs are decapod crustaceans of the infraorder Brachyura (meaning "short tailed" in Greek language, Greek), which typically have a very short projecting tail-like abdomen#Arthropoda, abdomen, usually hidden entirely under the Thorax (arthropo ...

which existed in

Alaska Alaska ( ) is a non-contiguous U.S. state on the northwest extremity of North America. Part of the Western United States region, it is one of the two non-contiguous U.S. states, alongside Hawaii. Alaska is also considered to be the north ...

and

Washington Washington most commonly refers to: * George Washington (1732–1799), the first president of the United States * Washington (state), a state in the Pacific Northwest of the United States * Washington, D.C., the capital of the United States ** A ...

during the

Eocene The Eocene ( ) is a geological epoch (geology), epoch that lasted from about 56 to 33.9 million years ago (Ma). It is the second epoch of the Paleogene Period (geology), Period in the modern Cenozoic Era (geology), Era. The name ''Eocene'' comes ...

period. It was first named by Mary Rathbun in 1916, and contains ten species, including ''Branchioplax washingtoniana'' from the

Hoko River Formation The Hoko River Formation is a Late Eocene marine sedimentary geologic formation. The formation is exposed in outcrops along the Strait of Juan de Fuca on the Olympic Peninsula in Washington state, USA. It is known for containing numerous fossils ...

, ''Branchioplax carmanahensis'', and ''Branchioplax ballingi''.Page 319, ''Bulletin de la Société géologique de France'', Société géologique de France, 1959. Branchioplax species 01 SR EC 07-01-26

References

External links

The Family Goneplacidae MacLeay, 1838 (Crustacea: Decapoda, Brachyura): systematics phylogeny and fossil records.

''Branchioplax''
at the

Paleobiology Database The Paleobiology Database (PBDB) is an online resource for information on the distribution and classification of fossil animals, plants, and microorganisms. History The Paleobiology Database originated in the NCEAS-funded Phanerozoic Marine Pale ...

Crabs Eocene crustaceans Eocene arthropods of North America Fossil taxa described in 1916 Taxa named by Mary J. Rathbun {{Eubrachyura-stub