ChrisMcA's picture

PinnPinn266

Observed: 28th September 2007 By: ChrisMcAChrisMcA is knowledgeable about InvertebratesChrisMcA’s earned reputation in InvertebratesChrisMcA’s earned reputation in InvertebratesChrisMcA’s earned reputation in InvertebratesChrisMcA’s earned reputation in Invertebrates
PinnPinn266
PinnPinn268
Description:
Identifications
Species interactions

No interactions present.

Comments

dejayM's picture

smooth

Origin 1 Aug 2013
Yes, what a strange looking crab - so smooth and unadorned (for good reason I suppose).
Most good web references are with Pinnotheres pinnotheres, its old name.
The difficulty for me, here, is scale. Nothing you can do about that now.
I think I have seen a number of pea-type crabs but haven't been able to ID them sufficiently to post.
"..the literature on the life history of pea crabs can be confusing and contradictory."
http://themuseumofcuriosities.blogspot.co.uk/2010/09/pea-crabs.html
and this web-link is interesting
EDIT - removed failed H'link (access denied)

JoC's picture

Once in France...

...we had mussels on a campsite, and there were tiny crabs inside. ( Our neighbours said to drink plenty of Alsace wine to sterilise them.) At that time I did not have Hayward & Ryland to hand! So only now do I know what they were. It's never to late to learn.
Jo

Jo

JoC's picture

Gender

Do we think this is a male? H& R says "male carapace hard & opaque. ... Female carapace poorly calcified, soft, translucent." I think 'Brown.' refers to both sexes.

Jo

ChrisMcA's picture

I've identified the container

I've identified the container it's in from clear views of logo on base from the same trip, & have the 'same' at home still, but sadly it's the 1 litre vsn where this was .6L vsn.. The 'gap' just before the crab in pic 1 was 3.5cm in my 1L, so assuming the .6L's just a miniature vsn (& as cube root of .6 is .8434) that gap would be 3.5x.8434=2.95cm. The carapace length given for female pinnotheres in Hayward & Rylands (that's front to back) is 1.2cm so that just about fits.
I agree JoC that the brown in H&R refers to both sexes, but given it's size & soft shell is a female, (& from dj's link it's the females that become 'obligate parasites'). Just after I'd put this ID up I noticed species.org includes the seasquirt Ascidia mentula as a 'home' for pisum as well; but otherwise H&R, Collins' & species.org all point to P. pinnotheres, fem.