Radula of Senegalese Okenia zoobotryon

June 9, 2006
From: Marina P. Ossokine


Dear Bill,

I'd like to dust off an old discussion on Okenia zoobotryon from Senegal. In 2004 you suggested this identification but with some hesitation because of the tubercle shape [message #10265 ].

During my 2005 stay in Senegal I saw this species in large numbers at several shallow sites, but always on the same bryozoan. So, I decided to check the radula of this species to see if the marginal tooth does have 2 cusps. The confirmation follows in attached here SEM photos...

Locality: Upper photo: Terou baye Sogui, 4 m, 10 mm long alive. Lower photo: Cap Manuel, Dakar, 5m, 8 mm long alive.  Senegal , Atlantic Ocean, 2-6 June 2005 .  Photographer: Marina Poddubetskaia Ossokine.

Moreover, I add here a close-up of the head which shows well the velum with (only) two appendages, as described in Valdes & Ortea's (1995) paper.

Also, I'm sending the photos of the related egg-mass in a separate message [#16798 ].

Best wishes,
Marina.
Nembro website

nembro@nembro.info

Poddubetskaia Ossokine, M. , 2006 (Jun 9) Radula of Senegalese Okenia zoobotryon. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/16797

Dear Marina,

Thanks for this valuable information. Certainly your animals look like others on the Forum from the western Atlantic and fit the original description of O. zoobotryon. In general shape and radular morphology they seem a bit different from the animals from Australia which I have identified as that species [message #12656], but they all have the characteristic three 'cup-shaped' lamellae on the rhinophores.

It certainly adds to our knowledge of the species.

Best wishes,
Bill Rudman

Rudman, W.B., 2006 (Jun 9). Comment on Radula of Senegalese Okenia zoobotryon by Marina P. Ossokine. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/16797

Factsheet

Okenia zoobotryon

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