Crab ID

MarineBioMel

New member
Anyone know what this crab is? It was a hitchhiker. Friend or foe?
 

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Allogalatheid Crabs - also known as squat lobsters but only lives on crinoids. Color patterns usually consists of alternating dark & light colored bands with white leg tips & claws; the colors always match the host crinoid. They are klepto-parasites that don't directly harm the host but steal its food.
 
yup! But apparently, according to several sites, they can survive just fine in your tank without a host crinoid. Mine is doing really well after about 3 weeks in my pico.
 
Hiho ;)

Hmm. Also, noob question I know, but how do I get photos to appear "big" in text instead of as a tiny thumbnail? Thanks!
When You include it with the post via the IMG-code. If You upload Your picture somewhere and post
Code:
[IMG]http://www.imagehoster.com/image12345.jpg[/IMG]
that should appear directly as "big" picture in Your post. Oh damn, the CODE-Code does not work correctly. Okay, then look here, last column (under "Attachments and Images: How do I add an image to a post?"): http://www.reefcentral.com/forums/faq.php?faq=vb3_reading_posting#faq_vb3_attachments

BTW: Squat lobsters should indeed not harm anything else in Your tank. ;)
 
Sweet! I still can't find the exact species online, so it must be a fairly rare one! LMK if anyone sees an exact match someplace.

Thanks Beastie for the photo info!
 
Ok, finally got a pic of its back! Horrible photo, I know, but he was far back in the tank. Hopefully good enough for an ID if someone knows the species. Thanks!
 

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Hm, for me that does not look like Allogalathea. I miss the long rostrum that A. elegans has – and that shall be the only species in that genus.

But there are 48 other genera in the family Galatheidae. Here is a catalogue of the super family, but not very much pictures, but You may want to take a look: http://decapoda.nhm.org/pdfs/28230/28230.pdf (2.5 MB).
 
How many pairs of legs does it have? In the first pic there seemed to be the first legs with claws & 3 other pairs but in the second picture there seems to be the clawed pair & 4 others in which case it's a true crab.

From the shape & color pattern in the second pic it's definitely not an Allogalathea in any case.
 
There are only 3 pairs of walking legs plus a pair of claws, so it is not a true crab. I am going to try to get some better photos - the point-and-shoot is clearly not doing the trick. It looks a lot like Allogalathea in color pattern, claw length, etc., but it definitely is missing the white stripe on the claws and the elongated rostrum.

Leslie, I know you are the resident worm expert - do you know any crab folks at your museum or elsewhere? I went to UNCW for my marine bio degree, but all the crab folks there work on temperate species. Thanks!
 
Leslie, I know you are the resident worm expert - do you know any crab folks at your museum or elsewhere? I went to UNCW for my marine bio degree, but all the crab folks there work on temperate species. Thanks!

Yes I do, plus I'm quite fond of crabs myself. If you can get some decent shots hopefully we can figure it out.
 
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