May 7, 2002
Dear Dr. Rudman,
I was wondering, can sea slugs really have shells?
email@example.comAmanda, 2002 (May 7) Sea Slugs with shells?. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/6897
Have a look at the page on how snails became slugs. It will give you links to other relevant pages. The basic point is that 'slugs' have evolved many times from snails through the gradual downgrading in importance of the external shell, until finally the shell is completely lost in the adult, although often still present in the larvae. Of all the sea slug groups, it is only in the nudibranchs that the shell is absent in all adults. In other groups, such as the cephalaspidean 'Bubble-shells', such as Pupa coccinata, an external shell is often present, while in the sacoglossans, we have a continuum from animals with an external shell, such as Volvatella ayakii to 'nudibranch'-like species, such as Stiliger smaragdinus, in which there is no trace of a shell.
From: Valerie Burkholder, March 7, 2006
What is a slug?
From: Steven Mcconnachie, September 16, 2005
Is sea slug a fish?
From: Stephaine, April 15, 2002
Sea slug from Indiana?
From: LV, November 23, 1999
Scientific Name for a slug?
From: Jaykada McFadden, October 26, 1998