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Moon crabs?

Discussion in 'Insects, Other Invertebrates & Arthropods' started by Mha8649, Mar 12, 2006.

  1. Mha8649

    Mha8649 Arachnosquire

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    Hi, I recently bought a couple of crabs for my daughter, they where advertised as moon crabs but online search for moon crab brought up not nadda. So I took a pic and hopefully someone can help me out with some info.
    I was also told they would go well in the same cage as her halloween crab..?
    cage is a 55g aquarium. 8in of sand leading into a 2 inch of water with feeder fish ....they seem to really like it, full spectrum lighting on a 12/12 automated cycle with additional land crab food supplement.and infraed heat lights. and under tank heat tape under the side with water keeps water at 78degrees f.
     
  2. Ecilious

    Ecilious Arachnosquire Old Timer

    Do you know anything about them that would help identify them? Where they're from, have they made burrows?
     
  3. Michael Jacobi

    Michael Jacobi RETIRED/RARELY USE AB Arachnosupporter

    The crabs in the US pet trade that are being incorrectly referred to as "moon crabs" are probably Gecarcinus quadratus, which are more commonly called "Halloween crabs". Do a google search with those names for info. There also has been a recent thread on this site.

    Cheers, Michael
     
  4. Thoth

    Thoth Arachnoprince Old Timer

  5. Mha8649

    Mha8649 Arachnosquire

    Well yes they have a burrow but no they didnt make it, they kinda ******* slapped the little one sold to me as a halloween crab.... and stole his burrow.
    I have two different species of crab in this tank one was sold to me as a halloween crab the two others where sold to me as moon crabs... I will post a pick of the one thats supposed to be a h.crab.

    as you can see these two crabs are deffinantly two diff species...this one is about the same size as the smaller "moon crab" in the background of the first pick and colors are very diff.
    p.s on another note I also picked up a baby A.avicularia and wow are they beautiful t's or what?! ..... :)
     
    Last edited: Mar 12, 2006
  6. Shido

    Shido Arachnopeon

    I have two of these one sold as a Halloween crab (Gecarcinus quadratus) and another sold as a rainbow land crab (cardiosoma armatum). they both reside in their own 10 gallons till their 30 gal gets set up gallon long. The Halloween is about 3 inches and the rainbow is about 4.5 inches. If anyone wants I'll post some pics, just let me know. I had a previous post about rainbow crabs.
     
  7. Mha8649

    Mha8649 Arachnosquire

    I would deffinantly like to see some pics for comparison and size and what not. I did a search for halloween crab wow that was a joke the only thing I found was a pic some chic took on her vacation to costa rica ...a crab walked up to her porch at night...I get most of my animals from jacks aquarium. and they are a very good pet store they also include caresheets for every animal they carry ....with the halloween crab I got pretty much all the info needed and then s0me but with the "moon crabs" I got at the reptile show....it was kinda funny my daughter is 4yrs old so shes only like a little over 3ft tall so she was eye level with the cage and I wouldnt have seen them but she was like" umm dad, I want that crab...I need some money." {D
    Her mother has taught her well..... :D
     
  8. Galapoheros

    Galapoheros ArachnoGod Old Timer

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    I've caught the sp. in the first pic at South Padre Island, Tx when I road hunt. Definitely the same kind. Blue/purple on top and bordered with orange. I could pick them up real soon after I caught them. They get used to being picked up pretty fast. Some were pretty big. Probably going again this summer and will take some pics if I find more. I also found one Cardisoma guanhumi at Padre as was ID'd by Wade on this forum. I saw allot of evidence of more of the crabs. Huge claws on the sand dunes at the south end of the island. I should go there at night with a good light. I can't get a tan so that's when I come out anyway.
     
    Last edited: Mar 12, 2006
  9. Mha8649

    Mha8649 Arachnosquire

    On the paper recieved from the pet store the care sheet has common and latin. there latin name is "cardisoma armata" I think they mint the armatum. and I've looked at the halloween crabs on the internet and they have yellow around the eye and this one does not...so I dont think they are the same. but doing a search on that name brings up a crab thats deffinantly not the same. It brings up a crab that looks more like the first pic thats supposed to be a moon crab.

    Well upon further searching for the moon crabs I found something called an indonesian land crab and its an exact picture ....as to how accurate there naming of it is...? but I kinda trust this site because they deal in the crab meat and they deliver crabs fresh to your door. or so they say.
     
    Last edited: Mar 12, 2006
  10. Mha8649

    Mha8649 Arachnosquire

    Yeah the link you provided that crab looks like the crab refered to as halloween crab...the one I have does not look like that it looks like the armatum. but the moon crabs or whatever they are look diff from the littler red crab...I dont know if maybe when he gets bigger he will start turning white.. but they look like each other ecept the coloration... they get along the little guy has a burrow now and the two bigger ones M.crabs are sharing a burrow.. as long as they don't fight or die I dont care.... Peace love and tarantulas man..
     
  11. Galapoheros

    Galapoheros ArachnoGod Old Timer

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    I know you can find the sp in the first pic along the s. tx coast if that helps with the ID. I know it's hard to go on my word so I will bring a few back and/or take pictures. So remember this thread. I don't think I'm going until around July. I will try to take some good pics. Going to try to find the owners of the huge claws too. If Wade would chime in, he could probably tell us what they are. Too bad for us that these animals eventually need saltwater. If it weren't for that, I'd probably be a crab nut. But as for now, I'll stick with just being a nut.
     
  12. Mha8649

    Mha8649 Arachnosquire


    Well after many hours of searching and finding this crab or what appears to be this crab with a ton of conflicting answers..I just gave up ....like I said as long as they do well...Im not concerned about wether there name is this or that. they eat well and don't seem to need salt water but if they for cant seem to live with out it thats not a problem either.
    Dont get me wrong I'm still interested in the facts. and if I come across them I will post my findings and will definantly be checking back..for any updates.
    oh and thanks for the link it had some helpful info. It definantly had the small one that was sold to me as a halloween crab on that link like Shido said it's the armatum one on the bottom left of the page ... and your right there are alot of diff crabs under the same name..
     
    Last edited: Mar 12, 2006
  13. Galapoheros

    Galapoheros ArachnoGod Old Timer

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    I just got through too. Looked at hundreds of land crabs on the internet but never saw the ones you have in the first picture. I wanted to know too because like I said, I've caught these in S. tx and was real curious. I found several with eggs. Walk real high off the ground. Oh well, Maybe someone will chime in that knows when I get pics on my next trip.
     
  14. Shido

    Shido Arachnopeon

    Okay after several attempts I finally got some semi-alright pics. They show a good example of their size. Also the smaller crab is the Halloween and the larger is the Rainbow (though they both look like Halloween crabs.) Final note, I had to put them in a plastic cup so they wouldn't run.

    Halloween crab size
    [​IMG]

    Halloween crab making a daring escape
    [​IMG]

    "Rainbow" crab size
    [​IMG]

    "Rainbow" crab size #2
    [​IMG]

    Crabs together (Rainbow left, Halloween right)
    [​IMG]
     
  15. Moon Crab

    We have a Moon Crab in a tank with play sand in one 1/2 of the tank, and water in the other half. We have a heat pad under the water side. We too had a light for heat and "light" but have read that they are nocturnal so we're trying not to give it too much light as he doesn't really take advantage of his tank space right now. This crab burrows in the moist sand in one corner and seems to be happy there as this is where he spends most of his time.

    We're planning on getting some feeder fish for the water end but in the mean time feed it shredded veggies and crickets which we kill for it. So far so good! We also read that they are called Halloween crabs but either way - Moon/Halloween - it's all good. :D

    Good luck with yours,

    Rosana - BedroomEyzOfBluu
     
  16. Cool pics and examples Shido - thanks for the information - helps us know what we've got lol :cool: which I believe is a Moon Crab.

    BedroomEyzOfBluu - Rosana
     
  17. Shido

    Shido Arachnopeon

    Thank you for the complement and I hope the best for you and your crab.
     
  18. roynie

    roynie Arachnopeon

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    I know this is an old thread, but there seem to be a bit of confusion, so I'll just add a small note in case it hasn't been solved elsewhere. I'll refrain from using English names, as it just messes it up. First, the ones on the photo in the first post are Gecarcinus lateralis. This species is pretty widespread in the warmer coastal parts of tropical W. Atlantic from Florida & Texas south to northern South America. This species is pretty variable, and while it always has the large dark blotch on the central carapace, the outer carapace and legs range from whitish, over orange to red (compared to the ones in the first post, check this individual with colours from the opposite side of the spectrum: http://crusta.de/wp-content/uploads/2007/08/gecarcinus-lateralis-3.jpg). The ones in post #14 are both Gecarcinus quadratus, which is found in warmer coastal parts of the E. Pacific between Mexico and Peru. Cardisoma armatum looks rather different and originates from western Africa (when young, the two American Cardisoma spp can be rather similar to young C. armatum, which presumably is the reason for the regular claim of Brazilian C. armatum).

    Anyhow, back to Gecarcinus: Here comes to confusing bit: Depending on who you ask, Gecarcinus quadratus is Gecarcinus lateralis. That is, some authorities (notably Burggren & McMahon 1988, and Turkay 1973) think it is a single species rather than two. Some think they're right in this assessment, others not. When also adding Gercarcinus [sic] aka Gecarcinus ruricola it becomes even more blurry. True Gecarcinus ruricola is another species found in the coastal regions of the W. Atlantic, but, unlike Gecarcinus lateralis, it typically has almost the entire carapace blackish or dark reddish-brownish (photo: http://www.kingsnake.com/westindian/gecarcinusruricola1.JPG). The problem are those supposedly Indonesian "Gecarcinus ruricola", which I haven't seen in life and therefore can't comment on with any level of authority, but if the indicated locality is right I'd question the use of G. ruricola for it, considering that Indonesia is just about on the opposite side of the World compared to the W. Atlantic. Confusing as this may be, the good thing is that if you can handle the three Gecarcinus mentioned here, you have the entire genus covered (at least if following the removal of four small-island species traditionally placed in this genus, but now sometimes in Johngarthia instead).
     
    Last edited: Mar 9, 2008