In 3-5 feet of water crawling on the sand during the day off Stocking Island, Exumas, Bahamas (Southern Bahamas) 5mm long alive. January 5, 2004. Photo: Anne DuPont
Animals reach 7mm in length and are active swimmers. The body colour is deep red to 'plum'. In some specimens yellow spots are scattered over the surface of the body. There is a bright yellow band at the parapodial edge. The anterior edge of the head shield is bilobed with a distinct median cleft. The siphon is simple as is typical for the genus. There is a pointed flagellum on the posterior part of the visceral hump. The gill is large, consisting of 7-10 plicate leaflets.
This species has been previously identified with the Mediterranean species Gastropteron rubrum by Abbott (1954, 1966) who reports it as 'moderately common' from Texas, Florida, West Indies to Brazil, and Marcus & Marcus (1960) who report it from Florida and Sao Paulo, Brazil and also note an earlier record from Guadeloupe. Gosliner adds new records from Yucatan Peninsula, Mexico and Caracas Is., Venezuela.
• Abbott, R.T. (1954) American Seashells van Nostrand: New York. 541pp [and later editions]
• Gosliner, T.M. (1989): Revision of the Gastropteridae (Opisthobranchia: Cephalaspidea) with descriptions of a new genus and six new species. The Veliger, 32(4): 333-381.
• Marcus, Ev. & Marcus, Er. (1960)Opisthobranchs from American Atlantic warm waters. Bulletin of Marine Science of the Gulf and Caribbean, 10(2): 129-203.
Rudman, W.B., 2004 (January 17) Gastropteron chacmol Gosliner, 1989. [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/factsheet/gastchac
Gastropteron chacmol from San Andres, Colombia
From: Les Wilk, January 21, 2006
Re: Colour variation in Gastropteron chacmol
From: James Lyle, August 31, 2005
Gastropteron chacmol mating?
From: Anne DuPont, August 30, 2005
Re: Elysia from Belize?
From: Jim Lyle, February 21, 2005
Elysia from Belize?
From: Julianne Parolisi, February 19, 2005
Colour variation in Gastropteron chacmol
From: Marina Poddubetskaia, March 4, 2004
Gastropteron chacmol from the Bahamas
From: Colin Redfern, January 20, 2004
Gastropteron rubrum vs G. chacmol
From: Terry Gosliner, January 20, 2004
Gastropteron from the west Atlantic
From: Bill Rudman, January 20, 2004
Gastropteron rubrum from the Bahamas
From: Anne DuPont, January 16, 2004