Pinnixa eburna Wells, 1928
Common name(s): Arenicolid pea crab, Lugworm pea crab
|Synonyms: Pinnixa eburnea|
|Pinnixa eburna, carapace width 7 mm wide by 3.5 mm long. Found in a burrow of Abarenicola pacifica on the mudflats of Padilla Bay.|
|(Photo by: Dave Cowles, June 2009)|
How to Distinguish from Similar Species: P. occidentalis and P. schmittii have carapaces more than 2x as wide as long and with pointed lateral margins, plus have no tooth on the inner margin of the dactyl of their chela. P. tubicola has a propodus longer than the dactyl on legs 3-5 and lives in Terebellid tubeworm tubes. Pinnixa faba and P. littoralis have strongly curved tips to their dactyls and usually live commensally in bivalves.
Geographical Range: Queen Charlotte Islands, BC, Canada to Puget Sound
Depth Range: Intertidal
Habitat: Commensal in lugworm burrows.
This species is not often collected.
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Ricketts et al., 1985
General Notes and Observations: Locations,
abundances, unusual behaviors:
This closeup of the chelipeds shows the tooth on the inner margin of the dactyl
The legs are flattened, translucent with darker spots or reticulations, and are fringed with long, abundant plumose setae. It can also be seen that the dactyls and the propodus of the walking legs are of approximately equal length (though the dactyls are mostly extended downward in this photo and may appear shorter), and that the dactyls are nearly straight. Notice that the last leg is much shorter than the others.
This view of the underside shows how much lighter the abdomen is, and also reveals that this individual is a female.