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Leslie

Critter Expert
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Posts posted by Leslie


  1. My god that's huge! It's a pelagic tunicate. The group name for these is Larvacea because they retain the tail & pelagic life style of typical tunicate larvae. Normally Oikopleura forms a mucus house which acts as a giant filter to collect food particles. The houses don't last very long so the Oikopleura constantly makes new ones while the discarded houses sink down to the bottom. See how there's a cloud of particles & mucus strings that travel at the same speed as the animal in your video? That's the transparent house.

     

    The typical larvacean (also called appendicularian) is tiny, just a few millimeters long and transparent. I've never seen one like this.

    http://www.microscopy-uk.org.uk/mag/indexm...jan01/oiko.html

    http://www.tafi.org.au/zooplankton/imageke...aria/index.html

     

    This image from the Philippines by the Poppes appears to be the same species. They called it Oikopleura and I'd love to know what reference they used for the name.

    http://www.poppe-images.com/?t=17&photoid=942672


  2. Hi Alex - It looks to me like Hamodactylus noumaea. Common name is gorgonian shrimp, with the color always matching the host. There's another species, boschmai, but that has a regular pattern of white dots on the back and is a bit more transparent.


  3. My guess is some species of stick crab like Chalaroachaeus curvipes -

     

    http://wetpixel.com/forums/index.php?showtopic=37345

    http://wikitivity.jp/scuba-diving/modules/...%82%A6%E3%82%B9

     

    The two legs with claws by the mouth are short & used for manipulation rather than walking. In Steve's pic the two legs are sort of dead center.

     

    Liquidguru's got an outstanding video on his http://divekbr.com/blog/?cat=4 which shows a related crab - the skinny sponge crab (Oncinopus or Achaeus depending on which reference you check) right after molting. It's using the two short arms to pick pieces of sponge away from the discarded carapace & transfer them to it's new carapace. This is typical behavior for decorator crabs & other crustaceans. Even the big hermits that carry anemones on their shells will move the anemones from an old shell to a new one.


  4. Here's the current list of species in Ancylomenes. Some of the most common species have been switched including the Caribbean pedersoni. The ones in bold are the species that are most often photographed

     

    A. adularans - A. aesopius - A. amirantei - A. anthophilus - A. aqabai - A. grandidens - A. holthuisi - A. kobayashii - A. kuboi - A. longicarpus - A. lucasi - A. luteomaculatus - A. magnificus - A. okunoi - A. pedersoni - A. sarasvati - A. speciosus - A. tenuirostris - A. tosaensis - A. venustus

     

    The other large group that's been split off from Periclimenes has been renamed twice, first Kemponia & then Cuapetes --

    Cuapetes nilandensis - Cuapetes agag - Cuapetes akiensis - Cuapetes americanus - Cuapetes amymone - Cuapetes anacanthus - Cuapetes andamanensis - Cuapetes calmani - Cuapetes darwiniensis - Cuapetes demani - Cuapetes edwardsi - Cuapetes elegans - Cuapetes ensifrons - Cuapetes grandis - Cuapetes johnsoni - Cuapetes kororensis - Cuapetes lacertae - Cuapetes longirostris - Cuapetes paulsoni - Cuapetes platycheles - Cuapetes rapanui - Cuapetes seychellensis - Cuapetes suvadivensis - Cuapetes tenuipes - Cuapetes ungujaensis

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