PDA

View Full Version : Crab ID


watson_barrett
01/14/2008, 10:46 PM
Can you ID this crab, i think he slowly killed two of my starfish. This is the exoskeleton he left behind last week...

http://reefcentral.com/gallery/data/500/144904Bach_party__crab__algae_008.jpg

watson_barrett
01/14/2008, 10:47 PM
I ripped one of his arms off a few weeks ago with plyers trying to pull a quick grab of him, he just shedded the arm and probably laughed at me.

watson_barrett
01/15/2008, 07:59 AM
Little more on this guy, he has almost zebra like legs, they are black and white striped and he has extreemly strong claws, he dug a hole out of a few rock and hangs out in them during the day and rarely comes out entirely into the light. At night he can been seen grazing on the coraline algae....

Anyone?

kar93
01/15/2008, 09:25 AM
Could me a Mithrax but is hard to ID without a better pic

watson_barrett
01/15/2008, 02:34 PM
I will try posting a few more pics this evening but I thought this was the best looking pic....

watson_barrett
01/15/2008, 02:35 PM
This guy is SUPER MEAN and NASTY powerful though, he ripped holes right through a few of my rocks with his claws. claws and legs look like briar bushes....

Beach Native
01/15/2008, 02:44 PM
Do yourself a favor, kill it now...

Twisted
01/15/2008, 02:44 PM
Emerald Mithrax would have flat tips on his claws, so I doubt it is a mithrax if it tore into a rock.

Most likely a plain old bad crab that hitchhiked in on some rock. If it can tear through rock, you certainly don't want it in a reef tank.

I would rip it's other claw off and laugh back at it. Take it to a local fish store and put it in with a big fish, or eel, especially an octopus, or a mantis shrimp if they have one.

sabazerehi
01/15/2008, 03:06 PM
looks like the one i'm trying to catch in my tank, lfs told me rock crab i also found something online saying they're called gorilla crabs, you can check those out and see if they match.

Troy the Nomad
01/15/2008, 03:08 PM
I say skewer him if you know where he stays.

kar93
01/15/2008, 04:13 PM
I am begining to think gorilla crab. BAD

watson_barrett
01/15/2008, 09:57 PM
gorilla crab definately a possibility. I havn't seen him since he shed his shell, he went into hiding after i ripped his arm off, i'm sure he'll reappear eventually and i'll be getting his other claw, I hate this mean creature...I'll try to find a few more pics, the shedded shell is a little lighter in color than it is normally...

watson_barrett
01/15/2008, 09:59 PM
regardless i did a search on gorilla crab and found this general rule: "If the claws are large and pointed, it's most likely a predator. If the claws are smaller and have blunt tips, then it's usually a herbivore and reef safe." This guy had identical claws to the predator nature.

watson_barrett
01/15/2008, 10:02 PM
here is a good photo of the shell under antics i took a few weeks back...http://reefcentral.com/gallery/data/500/144904Bach_party__crab__algae_011.jpg

watson_barrett
01/15/2008, 10:03 PM
and it's starfish eating predator claw

http://reefcentral.com/gallery/data/500/144904Bach_party__crab__algae_012.jpg

watson_barrett
01/15/2008, 10:04 PM
Note the right claw that i ripped off [RIH]

nismo driver
01/15/2008, 10:09 PM
note the still far less then helpful lack of quality of these pics..

seriously hows anyone to help when the lighting is terrible and all we see is a blur that remotely resembles a crab

try a white background with ample lighting and use teh macro setting of the camera and dont over zoom, then befoer posting look at the picture and make sure its in focus

watson_barrett
01/15/2008, 10:27 PM
Well if you can't see it has an obvious preditor claw then i think you may need new eyes but yet I know they are blury and I would take better pics on white ledger paper in hindsight. but the shell is long gone in the trash...this is all I have.


<a href=showthread.php?s=&postid=11610196#post11610196 target=_blank>Originally posted</a> by nismo driver
note the still far less then helpful lack of quality of these pics..

seriously hows anyone to help when the lighting is terrible and all we see is a blur that remotely resembles a crab

try a white background with ample lighting and use teh macro setting of the camera and dont over zoom, then befoer posting look at the picture and make sure its in focus

livingcorals
01/15/2008, 10:28 PM
If its doing more harm than good...Bring it in to the LFS or toss it. Why take a chance.
It does look like a gorilla crab tho.

watson_barrett
01/15/2008, 10:29 PM
Additionally the 1st pic is pretty good with the crap equip i'm working with...

Aquarist007
01/15/2008, 10:57 PM
<a href=showthread.php?s=&postid=11610360#post11610360 target=_blank>Originally posted</a> by livingcorals
If its doing more harm than good...Bring it in to the LFS or toss it. Why take a chance.
It does look like a gorilla crab tho.

I don't think the poster is listening guys:rolleyes:

StunnaShadez
01/15/2008, 11:16 PM
does it look like this guys? i took this picture from Devtech's thread:
http://i235.photobucket.com/albums/ee293/Darkrooms1986/DSC00447.jpg

watson_barrett
01/16/2008, 10:20 AM
I'll take a look this evening, i can't see the pic on the server i'm on.

Also, i'm definately listening have have learned some great info on predatory vs. reef safe crabs. This guy is definately getting the boot next time he reappears in the tank. I was just wondering what he was so I could do some additional research on him. If i catch him he is going in w/ the 3 foot baricuda at the LFS : )

thor32766
01/16/2008, 11:13 AM
looks like a type of gorrilla crab.