About 1/2 mi E of mouth of East Twin River (Oligocene of the United States)

Also known as RB36

Where: Clallam County, Washington (48.2° N, 123.9° W: paleocoordinates 47.8° N, 115.0° W)

• coordinate based on political unit

When: Pysht Formation, Chattian (28.1 - 23.0 Ma)

Environment/lithology: marine; shale

Size classes: macrofossils, mesofossils

• One specimen of left cheliped, showing portions of ischium, merus, carpus and proximal half of manus and an impression of the same (paratype e), [C. twinensis];

Preservation: mold/impression

Collected by Ralph Arnold, USGS in 1904; reposited in the USNM

• Station 80, register No. 4091; Paratype e, Cat. No. 353334 [C. twinensis];

Primary reference: M. J. Rathbun. 1926. The fossil stalk-eyed Crustacea of the Pacific slope of North America. United States National Museum Bulletin 138:1-155 [C. Schweitzer/S. Yost/M. Uhen]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 140249: authorized by Carrie Schweitzer, entered by Samantha Yost on 06.03.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

Malacostraca
 Decapoda - Ctenochelidae
"Callianassa twinensis" = Callianopsis clallamensis
"Callianassa twinensis" = Callianopsis clallamensis Withers 1924 decapod