March 5, 2005
From: Armando de Luca Junior
Do you know this species of Chromodoris?
Locality: Laje de Santos Marine State Park, Sao Paulo, Brazil. Atlantic Ocean. Depth: 12 metres. Length: 8 mm. 27 February 2005. Rocky bottom. Photographer: Armando de Luca Jr
Armando de Luca Jr
email@example.com Luca, Armando, 2005 (Mar 5) Unknown chromodorid from Brazil. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/13281
If you have more photos of this animal it would be useful as I can't see the gills or the rhinophores clearly, and their colour is often important for identifications. There are a large group of blue chromodorids with white and yellow lines in the Atlantic, and the Mediterranean, and species are often difficult to identify.
In the last major review of these blue chromodorids (Ortea, Valdés & García-Gómez, 1996), a new species, Mexichromis molloi, was described from Venezuela, which is quite similar to your species. The mantle is blue with a white median line, and there is an orange-yellow mantle border, inside of which is a dark blue band and then a white band. The gills and rhinophores are blue and there is a single white line along each side of the blue body.
However your animal matches almost exactly Kempf's sketches of Mexichromis kempfi (Marcus, 1970), which I have copied alongside. What I can't see in your photo is the colour of the foot. If you have another photo or a memory of the foot colour I would be interested to know. If your animal is M. kempfi, the other animals I have identified on the Forum as this species seem rather different but I am pretty sure they are the same species. The major difference is that the lighter blue mantle colour present in your photo, is often absent. However in Phanor Montoya's photos from Colombia [#3209] the pale animals have a dark blue foot. Interestingly, they also show traces of the white line on each side of the foot, which is described for Mexichromis molloi, and suggests that it may in fact be another colour form of M. kempfi. Marcus described M. kempfi from the north coast of Brazil, so your photo extends the known range of the species further south. It is a very useful addition to the Forum as it is the first photo I have seen which matches Kempf's original sketch so accurately.
Marcus, E. (1970) Opisthobranchs from northern Brazil. Bulletin of Marine Science, 24: 922-951.
Ortea, J., Valdés, A. & and García-Gómez, J.C. (1996) Revisión de las especies atlánticas de la familia Chromodorididae (Mollusca: Nudibranchia) de grupo cromático azul. [Review of the Atlantic species of the family Chromodorididae (Mollusca: Nudibranchia) of the blue chromatic group.] Avicennia, 1996, Suppl. 1: 1-165.
Re: Mexichromis kempfi from Little Cayman, British West Indies
From: Vinicius Padula, November 27, 2008
Mexichromis kempfi from Little Cayman, BWI
From: Deborah Chambers, November 26, 2008
Re: Mexichromis kempfi from Brazil
From: Vinicius Padula, January 12, 2007
Mexichromis kempfi from Brazil
From: Armando de Luca Junior, January 10, 2007
Mexichromis kempfi from Cozumel, Mexico
From: Charles Hopf, October 27, 2006
Mexichromis kempfi from Cozumel
From: James Lyle, August 22, 2006
Re: Nudibranch in Little Cayman?
From: Matan Ninio, January 17, 2006
Nudibranch in Little Cayman?
From: Larissa Roorda, January 16, 2006
Mexichromus kempfi from Bonaire
From: Les Wilk, December 15, 2005
Chromodoris kempfi - 'trailing' behaviour
From: Andreas Ahrens, March 6, 2003
Correct genus for Chromodoris kempfi
From: Elianny Dominguez Tejo, March 19, 2002
Chromodoris kempfi from Colombia
From: Phanor Montoya, October 20, 2000
Chromodoris kempfi? from Colombia's Caribbean coast
From: P. Montoya, March 31, 2000
Chromodoris kempfi from Florida
From: Anne Dupont, October 11, 1999