Glaucilla marginata
Bergh, 1860
Order: NUDIBRANCHIA
Suborder: AEOLIDINA
Family: Glaucidae
DISTRIBUTION
Circumglobal in temperate and tropical waters.
PHOTO
Collaroy Beach, Sydney, New South Wales. February 1987. 35mm long alive. Photographed from above to show foot - both Glaucilla and Glaucus float upside down.
PHOTO: Bill Rudman.
RELATED TOPIC
Both Glaucus and Glaucilla appear to be "monotypic" genera. That is each genus has only one species. The main external difference is that in Glaucus the cerata are arranged in a single row in each arch while in Glaucilla there are multiple rows. The biology of the two species is discussed under Glaucus atlanticus.
See photos of pelagic egg strings.
Reference:
• Bergh, L.S.R. (1860). Om Forekomsten af Neldefiim hos Mollusker. Vidensk. Meddel. Naturh. Foren. Kjöbenhavn, p. 309-331, pl. 8
Rudman, W.B., 1998 (November 6) Glaucilla marginata Bergh, 1860. [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/factsheet/glaumarg
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