Roboastra gracilis from Saudi Arabia

July 18, 2002
From: John Chuk


Dear Bill,
Here are images of a specimen of Roboastra gracilis photographed in the Red Sea at 'Black Mountain' dive site (about 550km south of Jeddah) on August 21 1992.

The specimen measured 25mm in length and was found crawling over filamentous algae on the reef flat at a depth of 2m. This was my first and only sighting of the species in the Red Sea. The second image is a close up showing the head in more detail.
Best wishes,
John.

jchuk@giant.net.au

Chuk, J., 2002 (Jul 18) Roboastra gracilis from Saudi Arabia. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/7502

Thanks John,
Usually the yellow lines are narrower than the blue-black background. In this animal the proportions are reversed. I have not seen many examples from the western Indian Ocean so I can't say whether this is a regional variation or not
Best wishes,
Bill Rudman

Rudman, W.B., 2002 (Jul 18). Comment on Roboastra gracilis from Saudi Arabia by John Chuk. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/7502

Factsheet

Roboastra gracilis

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