Branchioplax
Introduction '''''Branchioplax''''' is an extinct genus of crab which existed in Alaska and Washington during the Eocene period. It was first named by Mary Rathbun in 1916, and contains ten species, including ''Branchioplax washingtoniana'' from the Hoko River Formation, ''Branchioplax carmanahensis'', and ''Branchioplax ballingi''.Fossil ''Branchioplax carmanahensis''.
References
External links *  The Family Goneplacidae MacLeay, 1838 (Crustacea: Decapoda, Brachyura): systematics phylogeny and fossil records. *  ''Branchioplax'' at the Paleobiology Database