Tylodina corticalis - shell variability

June 5, 2006
From: Bill Rudman

In response to Kevin Lee's message [#16722] about variability in shell shape in Tylodina fungina I looked out some photos of the southeastern and southern Australian species, T. corticalis. In the other two messages [ #16799, #16801], the shells are quite flattened, but at times animals are found with prominent radial ribbing on the shell, making them look quite like some species of the pulmonate limpet Siphonaria. At one time I thought the ribbed shells were a southern feature, but Gary Cobb's photo from southern Queensland [#10630 ], certainly proves that to be an unsupportable hypothesis.

Locality: Port Lonsdale, west head, Port Philip Bay, Victoria, 21 April 1980. on kelp (Laminaria ) in tide pools. 3 animals - 15, 21, 32 mm live found, largest photographed. AM C121669. Photo: Bill Rudman. 

Best wishes
Bill Rudman

Rudman, W.B., 2006 (Jun 5) Tylodina corticalis - shell variability. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/16800

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