Protocaris

Protocaris marshi is an extinct species of bivalved arthropod known from a single specimen collected from the Cambrian Series 2 aged Parker Formation from the Parker Quarry of northwestern Vermont, United States^[2][3] The specimen is preserved in top-down view and has a bivalved carapace, a segmented trunk and a forked tail. Its precise taxonomic position is uncertain, due to the limited nature of known remains, but it is suggested to be a member of Hymenocarina belonging to the family Protocarididae, which also includes Tokummia and Branchiocaris.^[4]

Protocaris Temporal range: Cambrian Series 2 PreꞒ Ꞓ O S D C P T J K Pg N
P. marshi
Holotype specimen
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	incertae sedis
Order:	†Hymenocarina
Family:	†Protocarididae
Genus:	Protocaris Walcott, 1884 [1]
Species:	Protocaris marshi