''Protocaris marshi'' is an extinct species of bivalved arthropod known from a single specimen collected from the
Cambrian Series 2
Cambrian Series 2 is the unnamed 2nd series of the Cambrian. It lies above the Terreneuvian series and below the Miaolingian. Series 2 has not been formally defined by the International Commission on Stratigraphy, lacking a precise lower boundar ...
aged
Parker Formation Parker may refer to:
Persons
* Parker (given name)
* Parker (surname)
Places Place names in the United States
*Parker, Arizona
*Parker, Colorado
*Parker, Florida
* Parker, Idaho
* Parker, Kansas
* Parker, Missouri
* Parker, North Carolina
* Parke ...
from the Parker Quarry of northwestern
Vermont
Vermont () is a state in the northeast New England region of the United States. Vermont is bordered by the states of Massachusetts to the south, New Hampshire to the east, and New York to the west, and the Canadian province of Quebec to ...
, United States 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
Hymenocarina is an order of extinct arthropods known from the Cambrian. They possess bivalved carapaces, typically with exposed posteriors. Members of the group are morphologically diverse and had a variety of ecologies, including as filter feede ...
belonging to the family Protocarididae, which also includes ''
Tokummia'' and ''
Branchiocaris
''Branchiocaris'' is an extinct genus of Cambrian bivalved arthropod. The type and best known species, ''Branchiocaris pretiosa,'' was described from the Burgess Shale of British Columbia, Canada, in 1929, originally placed in '' Protocaris'', a ...
.''
References
Cambrian arthropods
{{branchiopoda-stub
Hymenocarina