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Leslie

Critter Expert
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Posts posted by Leslie


  1. I'm not sure about this one. To use the classic taxonomist's reply, I need to see a specimen. It could be an echiuroid but probably not. It could be a sipunc but not Sipunculus. It might be a sea cucumber but there are too many muscle bands. It might be a burrowing anemone. Hmmmm... the gut coils look more like a Sipuncula. So I'll stick with that until someone corrects me & then I'll swear that's really what I was thinking..... ;-D


  2. Nope, that's an sipunculan worm, phylum Sipuncula. That particular pattern of skin reticulation is typical of the genus Sipunculus. In echiuroids the proboscis is attached to the outside of the body & cannot be withdrawn. Sipuncs have what's called an introvert - the feeding structure is held within the body until the animal wants to feed and then it is extended outwards. There's a ring of tentacles at the end of the introvert which surrounds the mouth & which the animal uses to pick up particles. This picture shows an animal with the introvert sucked in & an inset with the introvert out.

    http://www.flickr.com/photos/artour_a/331307537/sizes/l/


  3. Hi Marcelo --

     

    Sammy De Grave sent me some id comments about your shrimp. The first one is a Sicyonia. They're common sand-dwellers, often found in huge numbers, and the large ones are very very tasty (that's my personal observation :notworthy: ). Second could be either Stenopus spinosus with really big range extension or a recently found undescribed one which has the same coloration as spinosus. No way to know without a specimen in hand.

    Cheers, Leslie


  4. Looks like it could be but then what's it doing outside of it's clam? Conchodytes tridacnae is an obligate commensal of giant clams.

     

    The other one is another obligate commensal by the name of Pontonia katoi.

     

    Not too many good photos of either of these and these are lovely.


  5. It's in the Humann-DeLoach Carib critter book as Paractaea rufopunctata but true rufopunctata seem to be restricted to the Indo-Pacific. Different authors classify the caribbean one as subspecies Paractaea rufopunctata nodosa or as a separate species Paractaeae nodosa.

    http://www.flickr.com/photos/artour_a/8411...57619715477653/

     

    The pink areas on the back are just bumps. Without a diver's bright light to show them off the bumps make these crabs look like bits of rubble.


  6. They do look like bees, don't they? They're small mysid crustaceans called Idiomysis tsurnamali. Only found in the Red Sea & surrounding areas, and always a commensal on sea anemones & the upside-down jellyfish Cassiopea. Unfortunately the only website that has close up images of them - dafni.com - is currently infected by malware so I don't advise going there.

     

    Fortunately, here on Wetpixel we have two threads with great images of similar species showing the odd body shape. Idiomysis is fairly unique because of the chunky body & thin curled tail. Most mysids are sleek and elongated, much more shrimp-like. You did a great job - especially in the last third of the video - focusing on individuals.

    http://wetpixel.com/forums/index.php?showtopic=29478

    http://wetpixel.com/forums/index.php?showtopic=23549


  7. I'm sure Bill would appreciate any reasonable suggestions & more to the point, actual help in keeping the forum going. SSF is an incredibly valuable resource for all of us and it would be a great shame if it would be converted to a static database. I can't think of any site which has its wealth of diver/beachgoer's/academic/aquarist observations backed by good photography and Bill's umpteen years of experience - especially Bill! Unlike the usual academic taxonomist who isn't in the least interested in what Joe Diver has to say Bill has always appreciated what thousands of pairs of keen eyes all looking for tiny bits of color can contribute to science.

     

    I've joined others in urging Bill to set up some way in which we can contribute monetarily. It would be a good way to say "thank you" for all the help we've received. Even if people didn't know it existed before today they've benefited from the SSF. That's where I, Marli, and many of the others who chime in with IDs for your photos get our information. Think about it - how many of us have spent hundreds of dollars on guide books? Make that thousands for some people. And certainly thousands for the gear to take all those nudi photos needing IDs! We can certainly afford to send Bill a few bucks to express our gratitude and help keep the Forum going.


  8. Hi Jeff - I'm pretty sure yours is Phycocaris simulans. The color seems to be quite variable.

     

    TisTam - here's what Sammy De Grave of the Oxford University Museum had to say about yours: "Its too small to tell if it could be a Phycocaris or a Neostylodactylus, both have that characteristic posture. If colour is anything to go by (which I do not know for certain), then yes maybe its a Phycocaris. Neither of them are known from the Red Sea"


  9. That's a good picture for id!

     

    In "Nudibranchs of the World" by Debelius & Kuiter this is listed as Hypselodoris cf maculosa 1. The "cf" means it's similar to but not really the same as maculosa and the "1" means that it is one of several color forms. It can be distinguished from the true H. maculosa by the solid orange margin; in H. maculosa the margin has small white spots. It might be found under another name in other nudi books.


  10. Cool! that's a particular favorite of mine. It's a polychaete genus called Amblyosyllis. The curly-q's are dorsal cirri, one pair per segment. They appear to be sponge symbionts but whether they feed on the sponge or not I don't know. Ellen Muller's got a good pic of another species in the genus. This one has it's dorsal cirri mostly uncurled.

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