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Leslie

Critter Expert
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Posts posted by Leslie


  1. There must be more color variation in living animals (not surprising) than reported in the literature. Below is how the 2 species are separated in a big monograph by Chace & Bruce 1993. The color in your animal doesn't really match either of them. I can get the original descriptions if you want them Les.

     

    Pereopods slender, dactyl of 3rd pair with accessory tooth on flexor margin sharply

    acute, propodus more than 12 times as long as wide; color brown marked with

    discrete darker reddish brown circles

    G. circellum Manning, 1963:54, figs. 3, 4

    (Florida Keys and Bahamas, western Atlantic;

    cryptic in coral heads to depth of 6 meters)

     

    Pereopods stouter, dactyl of 3rd pair with accessory tooth on flexor margin broadly

    rather than sharply acute, propodus less than 8 times as long as wide; color orange

    marked with cream-colored spots outlined in dark brown or black

    G. splendens Chace and Fuller, 1971:493, figs. 1-5

    (Puerto Rico, western Atlantic)


  2. #1 is a pycnogonid arthropod, commonly known as a sea spider

    #2 belongs to family Grapsidae, probably genus Percnon

    #3 is the mushroom decorator crab Cyclocoeloma tuberculata. It almost always has corallimorph anemones on the back


  3. Unfortunately the link didn't work. Normally Zootaxa only gives access to the first page (which is here zootaxa ) . You have to have a subscription to get complete publications unless the author pays extra to provide open access.

     

    The other two species - H. colemani & H. waleananus - are described in another subscription only journal here Aquapress


  4. Yes, that's more typical color for a severnsi. The color can be fairly light with "marbling"; the bright red patch at the curve of the neck, the small red spots on the breast, the red band where the tail connects to the body, the white tail, and the white spots seem to be consistent characters. Dave Harasti & Richard Smith have some nice shots of light colored ones -

    http://www.daveharasti.com/Seahorses/Hippo...rnsi/index.html

    http://www.oceanrealmimages.com/gallery/ma...2_itemId=223882


  5. Ah, now that's a gammarid amphipod. A local expert should be able to tell what the family is from the photo - Dr. Jim Lowry at the Australian Museum would be the fellow to ask. It would probably require dissecting out the mouthparts and other bits to figure out species though. And Gile's is right, it's a juvenile fish; just hatched judging by the size! Fantastic capture Matt.


  6. Hard to say. Similar things I've seen in the past were cnidarians (like an anemone or solitary hydroid head), sponges, foraminiferans or other types of large protozoan, tentacle masses, etc. It looks very delicate which means that only a diver would see it in good shape. If it were brought up for examination it would probably deteriorate very rapidly.


  7. Hi Graham -- They are both species of Hippolyte. The Xenia commensal is what's typically called Hippolyte commensalis in guide books. I couldn't find the other. There are many species which are commonly found on algae & are capable of quite a bit of color change depending on the color of the algae.


  8. Hi everyone --

     

    I belong to SCAMIT - the Southern California Association of Marine Invertebrate Taxonomists - a non-profit dedicated to educating & supporting local taxonomists. Most of our budget goes to training sessions for newbies and grants to encourage publication of new species. Like all non-profits we're always in need of money so I've put together a calender which features microscope shots of live UW critters collected off California, the Caribbean, and Hawaii. So if anyone needs a calender, likes inverts, has $16.99 (plus shipping) to spare and wants to support a good cause head on over to www.cafepress.com/scamit The calender is at the bottom of the page.

    Cheers, Leslie

    post-2918-1230401372.jpg


  9. Same phylum. The common name "gorgonian wrapper" is increasingly used for this species, more correctly known as Nemanthus annamensis. It seems to live only on whips & gorgonians & is usually open at night. I think the pattern on the body makes it one of the most gorgeous anemones around.


  10. Yup, that's all I got. I can't find any images of live acoetids - which is why I'm so excited about yours - and nothing about color in the described species. Even if there were some, there's no information on the usefulness of color in the family. If you'd like to legally get me an actual specimen so I can check body structures with a microscope I can give you a better name. In the meantime Acoetidae unidentified is the best I can do. And thanks for the information about habitat and behavior. That fits what's already known.

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