Micromelo undata
(Bruguiere, 1792)?

Superfamily: ACTEONOIDEA
Family: Hydatinidae


UPPER: Long Reef, Sydney, New South Wales. November 1989. Photo: Bill Rudman.
LOWER: Blue colour form laying egg mass. Margaret River, Western Australia, January 1985. Photo: Clay Bryce.


Micromelo guamensis (Quoy & Gaimard, 1825)?

There is some debate whether these two species are the same. Micromelo guamensis has been considered an Indo-West Pacific species while Micromelo undata has been a Caribbean species. Read the comments below to see the state of the argument.

Micromelo is closely related to Hydatina physis. In these cephalaspids the animal is beginning to assert itself over the shell which is becoming much thinner and less important as a protective organ.

• Rudman, W.B., 1972. Studies on the primitive opisthobranch genera Bullina Ferussac and Micromelo Pilsbry. Zoological Journal of the Linnean Society, 51: 105-119.

Authorship details
Rudman, W.B., 1998 (March 12) Micromelo undata (Bruguiere, 1792)?. [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/factsheet/micund

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