Hydroids? on Scyllaea pelagica
March 9, 2000
From: Anne DuPont
Dear Bill,
Here are some close-up photos of the animals showing hydroids on critter about 2 inches long, February 20, Boca Raton, Florida
Best wishes,
Anne DuPont
adupont@gate.net
DuPont, A., 2000 (Mar 9) Hydroids? on Scyllaea pelagica. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/2066Dear Anne,
What wonderful shots! They certainly look like hydroids but are in fact little papillae on the skin of the slug which function as gills. They are microscopic versions of the gills found in tritoniids such as Tritonia incerta.
Usually the gills aren't very obvious, because the animals we have to look at are half dead. Interestingly the great French naturalist Baron Cuvier illustrated these 'gills' almost 200 years ago, in a very detailed line drawing, which I copy here.
Best wishes,
Bill Rudman.
Reference:
Cuvier, G.L.C. (1805) Memoire sur la Scyllee, l'Eolide et le Glaucus avec des additions au memoires sur la Tritonie. Annales de Museum National d'Histoire naturelle, Paris, 6: 416-436, Pl 61.
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