Onchidoris depressa from Ratnagiri, India

December 16, 2009
From: Vishal Bhave

Concerning message #8642:

I have doubt about its identity but as a wide guess I think it is Onchidoris depressa!

Was seen on white colored bryozoa.

Locality: Rocky patch, Mandavi, Ratnagiri, 130 cm, Maharshtra, India, Arabian sea, 15 December 2009, Intertidal with rocks encrusted with bryozoans. Length: 6-8 mm. Photographer: Vishal Bhave.

Vishal Bhave

vishalbhave@gmail.com

Bhave, V.J., 2009 (Dec 16) Onchidoris depressa from Ratnagiri, India. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/22988

Dear Vishal,

I am pretty sure this is Onchidoris depressa. The brown spots and the long tapering mantle papillae seem quite distinctive characters. It is hard to believe an animal at home in the North Atlantic could be happy in the rather warmer waters of western India - but as I have found it in tropical New Caledonia and the much cooler waters of Tasmania, I guess it has a great temperature tolerance or perhaps is more than one very similar-looking species. As I said earlier, I can find no anatomical differences between New Caledonian and European animals.

These shallow water habitats you are investigating are proving very interesting

Best wishes,
Bill Rudman

Rudman, W.B., 2009 (Dec 16). Comment on Onchidoris depressa from Ratnagiri, India by Vishal Bhave. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/22988

Factsheet

Onchidoris depressa

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