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Chromodoris geometrica
Risbec, 1928
Order: NUDIBRANCHIA
Suborder: DORIDINA
Family: Chromodorididae
DISTRIBUTION
Tropical Indo-West Pacific.
PHOTO
UPPER: Coffs Harbour Region, northern New South Wales, December 1990. PHOTO: Bill Rudman.
LOWER: Siquijor Is., Philippines, Nov. 1998. Note purple on underside of anterior mantle. Photo: Erwin Koehler.
RELATED TOPIC
Mimics of Phyllidiella pustulosa.
Originally described from New Caledonia, there are now records from much of the Western Pacific. A very similarly coloured animal is found in the western Indian Ocean and was named Chromodoris conchyliata Yonow, 1984. Most authors have considered it a colour form of C. geometrica. Yonow (1994) has reported a dark, fairly "typical" colour form of C.geometrica from the Maldives in the Indian Ocean. This colour form is also reported here from the Philippines. See Valda Fraser's record from South Africa.
Apart from the characteristic dorsal colour pattern, which resembles a phyllidiid, this species is one of a group with a fairly large anterior mantle skirt which waves up and down as the animal crawls along, and is purple on its underside.
References:
• Rudman, W.B. (1977) Chromodorid opisthobranch Mollusca from East Africa and the tropical West Pacific. Zoological Journal of the Linnean Society, 61: 351-397.
• Yonow, N. (1993) Opisthobranchs from the Maldive Islands, including the descriptions of seven new species (Mollusca: Gastropoda). Revue francaise d'Aquariologie, 20(4): 97-130.
Rudman, W.B., 1999 (January 15) Chromodoris geometrica Risbec, 1928. [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/factsheet/chrogeom
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