PDA

View Full Version : can you Id a crab from just his shed?


majorjoey
03/20/2017, 12:45 PM
I have a hitchhiker crab that I wish to Id
was wondering what type he was
can you ID a crab via his shedding armour>?
http://reefcentral.com/forums/attachment.php?attachmentid=370000&stc=1&d=1490035442


thanks

Joey

majorjoey
03/20/2017, 12:50 PM
pretty sure this is same crab not sure why when he was younger (in his skin?)
his jaws are red but anyways offer to help ID

thanks

Joey

AlSimmons
03/20/2017, 12:59 PM
I think it might be a Stone crab. These will sometimes hitchhike their way into our tanks via live rock.

http://www.advancedaquarist.com/2010/12/inverts

sam.basye
03/20/2017, 09:36 PM
Looks like a mithrax.
The pointed claws indicate that it eats meaty foods. Supplementing with little bits of shrimp, etc. or shrimp pellets will keep it happy. They are opportunistic feeders, but won't catch a healthy fish.
Max size about 2.5-3".
They can be a very entertaining creatures.
There is an algae eating variant which has claws with flat, cymbal-like, tips for grazing algae.

majorjoey
03/21/2017, 01:23 PM
thanks for the replies

Ron Reefman
03/22/2017, 05:53 AM
Mithrax don't have black tips on their claws, at least not the ones I see. IMHO this is probably a stone crab, a carnivore which will grow way too big or die in an aquarium.

sam.basye
03/23/2017, 02:28 PM
You sure, Ron?

About 2 years ago I collected this one from the keys. I was always under the impression that it was a mithrax.
If I remember correctly, it was living with some larger red emeralds and some larger white ones.

http://i845.photobucket.com/albums/ab11/sambasye/IMG_20150316_021408134_zpsud3yzye2.jpg (http://s845.photobucket.com/user/sambasye/media/IMG_20150316_021408134_zpsud3yzye2.jpg.html)

http://i845.photobucket.com/albums/ab11/sambasye/IMG_20150921_185923539_HDR_zpsm2y3mpuq.jpg (http://s845.photobucket.com/user/sambasye/media/IMG_20150921_185923539_HDR_zpsm2y3mpuq.jpg.html)

Stone crabs are usually more oval-shaped and have a glossy shell.


Maybe it's a hybrid stonethrax crab? Lol

AlSimmons
03/23/2017, 02:49 PM
This link might help.

http://reefkeeping.com/issues/2003-12/rs/index.php

Ron Reefman
03/23/2017, 03:35 PM
You sure, Ron?

About 2 years ago I collected this one from the keys. I was always under the impression that it was a mithrax.
If I remember correctly, it was living with some larger red emeralds and some larger white ones.

Stone crabs are usually more oval-shaped and have a glossy shell.

Maybe it's a hybrid stonethrax crab? Lol

Stonethrax... I like it. :spin1:

No, I'm not sure, but then the Mithrax crabs I've collected are always either very green or very ruby. So no, I'm not sure.

Mrs. Music
03/24/2017, 05:23 AM
What you both have there are baby trouble makers. As soon as they are big enough to grab something they will.

majorjoey
03/26/2017, 06:59 PM
Nice link more crab Intel then I could uptake !
I will catch mine soon
as I spot him again

aromano
03/31/2017, 03:34 PM
that crab looks like a trouble maker. Mithrax are usually reef safe when small but even they can get rambunctious and cause issues. I have always heard black tip claws need to get them out of your tank.