Eggs of Glaucus and Glaucilla

May 16, 1999
From: Bill Rudman

In a reply to one of Ross Armstrong's messages with all the interesting observations on Glaucus atlanticus, I promised to post some pictures of the egg strings of Glaucus and Glaucilla marginata. At last here they are. The long ones are from Glaucus and the short from Glaucilla. Animals such as these which spend their whole life floating at the surface of the water would not be able to attach their egg masses to the bottom or some hard surface like most nudibranchs. Instead they produce a short single strand string of eggs encased in a thin mucus tube (not visible in the photos). These strings float in the water until the larvae hatch. Unfortunately I can't find my notes on the length of the strings.

Bill Rudman.

[Note added 23 June 1999: Here is a relevant paper.
Ross, R.M. & Quetin, L.B. (1990). Mating behaviour and spawning in two neustonic nudibranchs in the family Glaucidae. American Malacological Bulletin, 8(1): 61-66.]

Rudman, W.B., 1999 (May 16). Comment on Eggs of Glaucus and Glaucilla by Bill Rudman. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/867

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