[Cnidaria] Re: Cnidaria Digest, Vol 45, Issue 8

Fri Feb 1 00:17:16 PST 2008

The best specialist on Rhabdoon is right in Moscow, it is Sofia  
Stepanjants. She recently published this paper:
Stepanjants, S.D., Kosobokova K.N., 2006. Medusae of the genus  
Rhabdoon (Hydrozoa: Anthomedusae: Tubularioidea) in the Arctic Ocean.  
Marine Biology Research 2 6: 388-397.
Maybe it is more advisable to bring the specimen to her....
Preserved material might lose nematocyst tracks in many species, But  
that tentacle, with cnidophores, is very suggestive of Rhabdoon. Now  
there are two species in this genus. The second one has been  
described by SS. and KK. in the above mentioned paper.
In my opinion is it Rhabdoon due to the tentacle. Preserved medusae  
are often shapeless blobs, very different from the beautiful  
creatures they are when alive. One specimen, in a bad shape, is often  
not enough to identify a species. Doing it from pictures, then, it is  
even more risky. I have a little experience in rearing jellyfish, and  
I have seen that, during development, the same specimen can "become"  
many "species"! Or that the same "species" is indeed many different  
things. Or that species of the same "genus" have polyps of different  
"families".
We have to admit that often we must say: I do not know what it is. It  
had been often the case that this led to describe  new taxa!!!!
nando
Ferdinando Boero
DiSTeBA (Dipartimento di Scienze e
Tecnologie Biologiche e Ambientali)
Universita' del Salento
73100 Lecce
Italy
Voice: +39 0832 298619
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email: boero at unile.it

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natphen.html

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On 31/gen/08, at 19:3612:2, cnidaria-request at uci.edu wrote:

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>    1. Rhabdoon??? (Sofia Pyataeva)
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> ----------------------------------------------------------------------
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> Message: 1
> Date: Thu, 31 Jan 2008 21:33:46 +0300
> From: Sofia Pyataeva <sonya.bio at mail.ru>
> Subject: [Cnidaria] Rhabdoon???
> To: cnidaria at uci.edu
> Message-ID: <E1JKeEM-000Fzb-00.sonya-bio-mail-ru at f8.mail.ru>
> Content-Type: text/plain; charset="koi8-r"
>
> Dear Cnidariologists,
> Could you help us to identify this medusa?
> It was found not far from Iceland and preserved in formalin.
> Umbrella looks oblique, but probably owing to unfortunate fixation.  
> It looks like there are no bulbs! Four radial canals and circular  
> one, single tentacle, the tentacle ending consists of numerous  
> stalked groups of cnidocysts.
> It seems to be Rhabdoon singulare, but we found no cnidocysts  
> tracks... (Or possibly these light-refracting points in exumbrella  
> are cnidocysts? (showed by arrows)). But they are scattered in  
> exumbrella and do not form tracks...
> Please see attached pictures!
>
> Thank you very much in advance,
> Kind wishes,
> Sonya.
>
> __________________________________________________________
> Sofia V. Pyataeva
>
> Dept. Invertebrate Zoology
> Faculty of Biology
> M.V.Lomonosov Moscow State University
>
> Leninskie Gori
> Moscow 119 991
> RUSSIA
>
>
>
>
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