Hydatina physis from Florida

July 7, 2008
From: Linda Ianniello


Concerning message #21498:

I couldn't resist sending you these shots of a Hydatina physis from the Atlantic! There are many shots of the Pacific ones, but very few of living animals from the Atlantic. I was thrilled to find it and get some shots .....

Locality: Lake Worth Lagoon, 5 feet, Florida, USA, Atlantic Ocean, 04 July 2008, Inlet, tidal. Length: approx 2 inches. Photographer: Linda Ianniello.

Thanks for the great forum and all the work you do on it.

Regards,
Linda I.

lindai1@bellsouth.net

Ianniello, L.M., 2008 (Jul 7) Hydatina physis from Florida. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/21677

Dear Linda,

Thanks for an Atlantic example - of which we have very few. In fact I think yours is the first on the Forum from the west Atlantic. This Caribbean animal used to be considered a separate species, Hydatina vesicaria, but there appears to be no recognisable anatomical differences between it and the Pacific H. physis.

I have included a close-up alongside of the head as it shows part of the Hancocks Organ which is the chemosensory organ in primitive cephalaspidean sea slugs. Usually it is a pad or groove on each side of the head, but in species of Hydatina it consists of a row of folds or 'flaps'.

Best wishes,
Bill Rudman

Rudman, W.B., 2008 (Jul 7). Comment on Hydatina physis from Florida by Linda Ianniello. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/21677

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