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[Annelida] Unidentified animal (with pictures, sorry)

Thomas Wehe via annelida%40net.bio.net (by iphione from t-online.de)
Tue Mar 20 08:03:51 EST 2018


Hi Paulo,

it is not easy to judge from the pictures, but I would rather follow Dave’s interpretation. The yellow parts to me do not appear like scales of a scale-worm. They are to rectangular in outer shape and what you would interpret as the elytron surface seems to be rounded like looking on the surface of a tube from above. Also the position of the scales would be a bit unusual. These structures fit more to massive downwards bend anterior legs like in corophoid- or tanaid-like crustaceans seen from above. The locomotion track with the pronounced parallel lines fits better with bilateral crustacean appendages. I am not aware of acoetids crawling around with their tubes. But maybe someone else knows.

Kind regards,
Thomas Wehe


> Am 20.03.2018 um 09:17 schrieb Ton Van Haaren <TonVanHaaren from eurofins.com>:
> 
> I really don't know, but what if these yellow parts are the reflecting scales of a scale-worm and the "antenna" are the anal cirri?
> And as they construct tubes, perhaps Acoetidae?
> Just guessing
> Best wishes from Amsterdam
> Ton
> 
> -----Original Message-----
> From: annelida-bounces from oat.bio.indiana.edu [mailto:annelida-bounces from oat.bio.indiana.edu] On Behalf Of Karlen, David
> Sent: 19 March, 2018 13:41
> To: Paulo Henrique BONIFÁCIO
> Cc: annelida from magpie.bio.indiana.edu
> Subject: Re: [Annelida] Unidentified animal (with pictures, sorry)
> 
> EXTERNAL EMAIL*
> 
> 
> 
> Hi Paulo,
> 
> 
> It looks like it could be a corophid-like amphipod or tanaid crustacean, although very large if your 10 centimeter size estimate is correct. The wood piece looks like a mucus/detritus tube and if you zoom in on the picture there appears to be a pair of antennae above the yellow structures which also may be a pair of modified antennae? I would be interested to hear what other folks think.
> 
> 
> Thanks,
> 
> 
> Dave
> 
> 
> 
> 
> 
> 
> David J. Karlen, Ph.D.
> 
> Chief Environmental Scientist
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> ________________________________
> From: annelida-bounces from oat.bio.indiana.edu <annelida-bounces from oat.bio.indiana.edu> on behalf of Paulo Henrique BONIFÁCIO <paulobonifacio from gmail.com>
> Sent: Monday, March 19, 2018 8:15 AM
> To: annelida from magpie.bio.indiana.edu
> Subject: [Annelida] Unidentified animal (with pictures, sorry)
> 
> Hi everyone,
> 
> A colleague doing annotation from ROV images observed this animal (black
> circle) and we dont what it could be.
> It seems to use the wood piece (?) to live as a hermit grab. I supposed the yellow structures could be in the anterior region but if its the case it moves backwards. I think its not a polychaete but i have no idea what could be. It seems to have about 10 centimetres (maybe more).
> 
> The photos were done from 520 and 575 m depth in l'Astrolabe Bay Papua New Guinea.
> 
> Some idea???
> 
> Thank you,
> Paulo
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> Paulo Bonifacio
> bonif from me.com
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