nightfly's picture

Pilumnus Hirtellus

Observed: 8th September 2012 By: nightflynightfly’s reputation in Invertebratesnightfly’s reputation in Invertebratesnightfly’s reputation in Invertebratesnightfly’s reputation in Invertebratesnightfly’s reputation in Invertebrates
8th Sept 2012 (134)
8th Sept 2012 (133)
12 Sept 12 (13)
12 Sept 12 (10)
12 Sept 12 (9)
12 Sept 12 (7)
Description:

A few more pics of these casualties which were taken after they had been rinsed are now added. I forgot I had taken them until now- 12/03/13.

Identifications
Species interactions

No interactions present.

Comments

ChrisMcA's picture

Tricky to say; in even the

Tricky to say; in even the big one the claws not so different, & not so hairy; an idea of the size would help

nightfly's picture

I think there is a

I think there is a reasonable difference in claw size on the bigger one, from memory it was about 3-3.5cm across the carapace. They are all odd looking as they were undergoing digestion within a cods stomach- ie odd colours. Yeah I know it isn't very hairy but I just dont know what else fits the bill other than P.h.? It seems to be the right shape. I definitely think the 2 larger crabs are different species.

The left pincer on the smallest and the biggest crab are much bigger than their other one.

Cathal.

ChrisMcA's picture

I guess you're right on the

I guess you're right on the large one, though hairy crabs are small (up to 3cm in Marlin). Their '5-a-side' anterolaterals are illustrated & described (marlin & Collins) as sharp (unlike yours); & the smaller claw (propodal surface of) is always spiny (I can barely see pimples) where lgr is smooth/ with tubercles. But marlin et al also say the frontal region between the eyes is finely serrated which shows up in photo 2.
Reckon the smaller one, w. cleft(you mentioned)& channel between 3rd&4th teeth (as in Marlin) is Xantho pilipes. Marlin then spoils this by saying "4 obtuse teeth" (species.org says 5). Tooth no. 1 is right next to the eye. (&N.B. no back legs to show hairyness).

nightfly's picture

A lot of info there Chris,

A lot of info there Chris, cheers for the feedback. I suppose the question for me at this stage is which other crab species have a similar difference in claw sizes to P. hirtellus? I think my original ID was based on me not knowing of this feature in other crabs b ut I didnt draw this conclusion from any attempt to research it if I'm being honest.

Cathal.