Bulla gouldiana, detail of shell markings

February 27, 2006
From: Mike Neubig

Dear Bill,

Thank you very much for your comments [#10999 ]. A detail of the same individual Bulla gouldiana as in my top two photos show three types of markings. Growth, parasite, predator (green, white, b&w)? It is interesting that the diffuse color patterns are neither delimited or structured by the growth patterns.

Locality: Valley-Sea-Toes, La Jolla Shores,, 14 m, California, USA, Eastern Pacific, 16 February 2006, Gradually sloping sand bottom. Length: 20 mm (shell). Photographer: Mike Neubig.

Best,
Mike

mike.neubig@gmail.com

Neubig, M., 2006 (Feb 27) Bulla gouldiana, detail of shell markings. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/15911

Dear Mike,
Thanks. The shell colour is deposited by the edge of the mantle - which is a layer of tissue which lines the inside of the shell. The growth lines you see in this species probably represent 'slowdowns' in growth rather than actual stoppages. Sometimes when the shell is edge is broken off, and repair and regrowth occurs, you will see a distinct break in the shell pattern.
Best wishes,
Bill Rudman

Rudman, W.B., 2006 (Feb 27). Comment on Bulla gouldiana, detail of shell markings by Mike Neubig. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/15911

Factsheet

Bulla gouldiana

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