Branchioplax

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,^[1] including Branchioplax washingtoniana from the Hoko River Formation,^[2] Branchioplax carmanahensis,^[3] and Branchioplax ballingi.^[4]

Fossil Branchioplax carmanahensis.

Branchioplax Temporal range: Eocene PreꞒ Ꞓ O S D C P T J K Pg N
Fossil Branchioplax washingtoniana
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Malacostraca
Order:	Decapoda
Suborder:	Pleocyemata
Infraorder:	Brachyura
Family:	Mathildellidae
Genus:	Branchioplax Rathbun, 1916 [1]