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Red Emerald Crab; ID, comp. 9/15/15
Taxonomic info 12/11/12 Emerald Crab...black? 09/01/08 Hello WWM Crew! Just curious what this crab is that I seem to have. He came along unexpectedly with one of my corals that I purchased about 6 months ago. He was quite tiny - about 1/2" or so - but just looked like a little emerald crab - same shape, hairy legs...but seemed a little darker in color. I didn't see him again in the tank and figured he didn't make it...until about 3 or 4 weeks ago when low-and-behold...there he was! MUUUUCH larger now...about the size of an adult Emerald Crab....only pitch-black in color. Green Emerald Crabs are quite common in every fish store I've ever been in, but I've never seen a variety that is black. Any idea what I have? Just an odd-ball colored variety of the Emerald Crab? <It is likely some species/variety of Mithrax crab. Sorry, but without a pic I honestly can't tell you much more than that... :-/ > I'd send a picture, but the only times I've seen him he's hiding between the rocks. Thanks, Chris <Do keep an eye on him... Best, Sara M.> Emerald Crab ID?? 3/11/07 Hey guys, <Brian> I went to a LFS to buy an Emerald Crab about 2 months ago, when I got there they were all tan/beige colour. The LFS said that it was because of the algae they were eating in the tanks. <Mmm, could be, I had a pizza last night and this morning I was yellow. Do not believe this is the case.> I bought him anyways, my last Emerald Crab was bright green so I figured the new one would turn green eventually. He just molted today and now is gigantic compared to the original size, but still hasn't turned green. Do you think that maybe they pulled the wool over my eyes and that its not an emerald crab? It looks the exact same as my last green one, same carapace, same hairy legs, same claws but he's just beige instead. What do you guys think? <I'm not aware of any beige Emerald Crabs, the name certainly implies the color. Bob?> <<Not all are green, nor stay green. "Follow the Yellow Brick Road"... Might be Mithrax forceps... see WWM, the Net re. B>> Thanks <Brian, in future queries, do cap beginnings of sentences, proper nouns, and "I's". We just do not have the time to correct text before posting on the dailies. James (Salty Dog)> Brian Mithrax Crabs Hey fellers, <Hey Hey> I was just reading your postings on bubble algae. I have a small patch of the stuff which I vacuumed up once but it came right back. I saw your recommendation for Mithrax crabs. Are they reef safe? <They are supposed to be, but every crab has its own personality.> Do they have a common name or are they only known as Mithrax crabs? <Around here (Northern California) they are usually labeled Emerald or Green Crabs.> One last; could aging lights be partially responsible for this pesky stuff? I've never had troublesome algae before. <Can happen with other types of nuisance algae, but not usually the bubble algae. As the bulbs get older they can drift towards the warmer end of the spectrum and encourage nuisance algae. Be sure nutrient export is good, manual removal of the algae may work best. -Gage> - The not-so-Emerald Crab - <Greetings, JasonC here...> I went to my LFS tonight and found an Emerald Crab that was pink instead of green. I of course had to purchase him but am really curious as to why he's this different color. Is it common for these to vary this drastically or did I get an oddball? <Well... my guess would be that this is not an actual emerald crab [Mithrax sculptus] but perhaps a close relative - there are other crabs in the Mithrax family which have the coloring you describe. Another option is the crab's diet, which can also affect the coloration. Perhaps we should ask the crab... ;-) > My LFS said they originally thought it was because he was going to shed but they have had him for close to 2 weeks now and nothing has happened so they believe it's just his coloring. He is eating *very* well and shows no signs of disease. <Ahh good.> On another topic, when a Turbo Grazer Snail is bred, how long until they lay the eggs? <Oh... that is a good question, and one to which I don't have a very good answer. My guess is about a week perhaps less, depending on temperature.> Ronni <Cheers, J -- > Crab Id please? Hey Crew.. I think I've found the
clicking source from my tank. <nope... but I'm glad to hear your
optimism :) You still will hear the clicking. Quite likely a small
pistol shrimp from the live rock or sand> Think this is it?
<Nope> Some kind of crab? <yep... this image shows a
Mithraculus (AKA Mithrax or Emerald Green crab). They are good algae
grazers but dubiously reef safe in the long run> Thank you! |
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