Thyone roscovita

David Fenwick Snr Does anyone recognise this holothurian, lowershore, semi-exposed shore, just over 50mm in seawater. Thanks. I may add to the post as I have the specimen here and I'm waiting for it to feed. Hoping it'll not need microscopic examination.

David Fenwick Snr I'm thinking Aslia lefevrei as it was with Pawsonia but the tentacles look double-rowed at the extremities.

Bernard Picton It looks like a Thyone to me. Are the tube feet scattered all over and not just in rows?

David Fenwick Snr Yes they're all over but seem to be more prominent in rows than between.

David Fenwick Snr Here's another image taken this morning.

David Fenwick Snr Thanks for looking at it Bernard Picton

David Fenwick Snr Great news. Species has just been determined, it's Thyone roscovita. Dr. Paul Gainey has been looking at it, and had to take numerous skin samples to look for microscopic spicules, before he eventually found some and confirmed it by finding them in the tubed feet at the tail end of the animal. More information available for this species at http://www.habitas.org.uk/marinelife/species.asp?item=ZB4980

Charlotte Bolton Am hoping this is quite a simple Q for the echino experts out there! Lyme Bay, 25m bsl, fairly silty coarse gravel/sand between up-to-0.5m boulders. Is this a Thyone sp.? Can convince myself it looks like the T. ruscovita pic on Habitas but it wasn't in mud... N. mixta also present. TIA for all suggestions/clarifications!

Charlotte Bolton Yes, I think there's body exposed there - looks dark to me so Aslia lefevrei? I asked about Thyone because I know we've had it here in Dorset but I haven't noticed it myself; I was slightly unsure about the 'mud' habitat too...

Charlotte Bolton But equally it was more like 'mud' than wedged in a rock crevice... Sigh.

Charlotte Bolton Neopentadactyla mixta was definitely there as well...

Bernard Picton I’d say Thyone roscovita. The top of the body looks right, with a black collar.