[Cnidaria] RE help in identification

[Peter.Schuchert at ville-ge.ch]

> I would greatly appreciate if you could help me identify the hydromedusa
> I posted at
> http://www.com.univ-mrs.fr/~botha/jellies.htm

dear Delphine,

this is very likely Sarsia tubulosa (M. Sars, 1835). Although Sarsia
tubulosa is more a northern species (Brittany to Norway), I know that the
medusa  has been seen a few years ago in a canal near Marseille.
Unfortunately, the long manubrium is contracted and the gonad is in folds,
so it can't be excluded that it is Dipurena ophiogaster. Sarsia tubulosa a
has a single, uninterrupted gonad wrapping the manubrium, while Dipurenal
ophiogaster has it spilt in several rings..
For more details see:
http://www.ville-ge.ch/mhng/hydrozoa/pdf/schuchert2001b.pdf

Meilleures salutations,


Peter Schuchert
Muséum d'histoire naturelle
Route de Malagnou 1
CH-1211 Genève
Suisse
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