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Leslie

Critter Expert
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Everything posted by Leslie

  1. It's a odd little bivalve and I'm being very stupid this morning, can't remember the name. Anyway, there's a number of these which act much more like snails than clams. Their shelves are covered with a fleshy layer, can be smooth & translucent or papillated like the one you shot. I'll have to look it up.
  2. Many thanks on behalf of Sammy. He will be quite pleased. And those other inhabitants are really cool! I suspect the small shrimp in the 3rd pic is a juvenile Periclimenaeus.
  3. Brian's right (good work Grasshopper).... genus Diopatra, family Onuphidae. Easy ID - 5 antennae, tube builder, and the anterior gills are stalked with small filaments arranged in spirals. None of the other onuphids have spiralled branchiae. There aren't any photo records of this with a species name attached that I know of but I'll look in my literature files. A number of species are described from the region so maybe I can find something. Matt S also photographed this on a prior trip. One cool thing about Diopatra species is that they're farmers. Many species like to attach algae to their tubes. It gives them camouflage, attracts other animals which they may eat, and they often eat the algae themselves.
  4. Hi Eric -- I hadn't even seen your post when I got an email from Sammy De Grove, the lord high shrimp expert at Oxford, who lurks here on occasion. Your shrimp is Periclimenaeus storchi (not a true snapping shrimp, wrong family), he says it's an outstanding image ( I totally agree), and he wonders if I could get a high-res image (copyright included is fine) from you that he can use in lectures. :-D
  5. Are you sure about this one Alex? I dont' see any sign of fins, head spines, etc.
  6. Yup, the rear end of a polychaete. Photograph one with the head on and I might be able to tell what kind it is. :-))
  7. Hi Alex -- I think you may be right. What a well camouflaged little guy! There are currently 7 species in the genus only a few of which are well known to divers and worm girls. It will take an IP crab expert to puzzle this one out for us.
  8. That's pretty much what I expected. My guess is that there are as many undescribed species of flatworms as there are described ones --- maybe more.
  9. Yes, it's a flatworm. Nudibranch books will not be helpful. :-)
  10. Hi Peter -- Awwww, it's cute! It's an isopod. Family Arcturidae. A bit more information on your local ones here: http://www.discoverlife.org/mp/20q?search=Arcturidae Dr. Gary Poore at Museum Victoria (I think) or George Wilson (Australian Museum) are lthe isopod authorities for your part of the world.
  11. Yup. If you really want to give it a try contact Rocha here on WP. He can give you some names or links to keys or he might say that without a nicely preserved specimen there's no way to id it. Drew had a thread going a year or two ago. He had a greenish one and really wanted it to be a larval green moray. When I showed his pic to the fish guys here at my museum & asked for an id they just laughed.
  12. The wormy things are leeches, many of which have pseudo-annulations so they can look like polychaetes. That inch-worm posture is very characteristic. The other thing is a juvenile stage of a gnathid isopod. The head is down below on the left & the siphon-looking structure is the tail. They're blood suckers like leeches. More info on them here http://dailyparasite.blogspot.com/2010/08/...rimaculata.html
  13. Basically they can only be identified by an expert or someone willing to puzzle his way through a scientific key. Two of the important characters are the number of muscle groups and arrangement of pigment spots, plus comparative ratios of one body part to another.
  14. It's a rolled-up Olindias jelly. What I've read is that they roll up & hide in the bottom or among algae when they're not out swimming & hunting. there have been two previous inquiries about this particular species, one from Lembeh & one from PNG - http://wetpixel.com/forums/index.php?showt...amp;hl=Olindias http://wetpixel.com/forums/index.php?showt...amp;hl=Olindias
  15. Copepods, genus Sapphirina. They're very common throughout the seas. Here are some close ups http://www.flickr.com/photos/artour_a/3993...157624819281463 http://www.imagequest3d.com/pages/articles.../sapphirina.htm http://www.animalsandearth.com/photo/view/...na%20sp#viewed# http://solvinzankl.photoshelter.com/galler...0000s5ZF4MhSkhU
  16. hi Marli -- It's family Sabellidae. There are only a few genera of sabellids, let along species, that can be identified from pictures. I can see two radioles (the feathery plumes that make up the crown) sticking up while the other radioles are curled down. Do you have other pics clearly showing the tips of the two upright ones? I think I see small black swellings at the tips which would be eyes which would make this the genus Megalomma. If the tips are bare you'll have to be satisfied with just the family name. Cheers, Leslie
  17. Phylum Sipuncula, Sipunculus nudus. One of several types of worms known as peanut worms due to the marking on the skin & shape when contracted.
  18. Worm. It's the last body region of a polychaete worm known as Chaetopterus. They're rather bizarre because the body is so highly modified. http://scienceblogs.com/deepseanews/2007/02/vermes.php They pump water through their tubes to catch food with a net secreted from mucus and they also create a bright blue luminescence. I think this last section breaks off when the worm is disturbed as it moves about rapidly and draws attention away from the main body.
  19. They really are beautiful animals. Thanks for posting!
  20. Thanks Marli! That was enough memory jog -- stalked jelly Halicystus. Haliclystus auricula is the best known as it occurs throughout the northern hemisphere. There are about 10 species. http://www.marlin.ac.uk/speciesinformation...?speciesID=3445
  21. It's a type of upside-down jelly. You can see the mouth in the center of the animal. Not Cassiopeae. I've seen similar ones in the Caribbean.
  22. This is often mistaken for a sea slug but it's a velutinid snail. I'm not sure what the right name is - possibly Coriocella hibyae. There seems to be a lot of confusion over the proper name even for the common ones. Go to nudipixel for a variety of photos and see if any of them match yours http://www.nudipixel.net/family/velutinidae/
  23. I'm, glad you joined. Anyone who posts polychaete pictures is my new best friend! Do you have images of them swimming? I've spoken to 2 colleagues who specialize on fan worms & neither of them have ever heard of Branchiomma leaving the tubes except in response to habitat disturbance or predation. There are no reports of them emerging from the tubes to spawn either. So they are very curious about this behavior. Small sabellid species are much more mobile than the large ones. They can swim better & it's easier for them to rebuild tubes. Not all of the species on the list will make it into the Mediterranean. B. spongiarum, for example, is a cold water species described from the Faroe Islands. Another species newly described for the area is Branchiomma maerli - Licciano & Giangrande 2008 - the genus Branchiomma in the Mediterranean with the description of B. maerli http://scientiamarina.revistas.csic.es/ind...viewArticle/940 Branchiomma bairdi is a newly recognized introduced species in the Mediterranean. It originated in the Caribbean http://www.informaworld.com/smpp/content~c...ll~jumptype=rss Color is not always a good way to identify polychaetes. There are some species in which the color pattern is absolutely unique while in others it may be quite variable. A striking example is the christmas tree worm which can be red, white, yellow, blue, green, orange, brown, or even a mix. It always takes specimen examination to be really sure of the species ID. Cheers, L
  24. Welcome to Wetpixel! This is one of the few genera of fanworms that are easy to identify if the images show the right details and fortunately your second one does. See the little filaments on the outside of the feathery crown? The only genus that has these is Branchiomma. About 7 species are reported from Italy & adjacent areas, some native & some introduced. Your observation about the worms moving in response to environmental changes is quite interesting. I've noticed that they will rapidly leave their tubes & swim away when disturbed but I don't think anyone has reported this type of migration. Can you tell if they are releasing eggs & sperm as they move? thanks for posting-- Leslie
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