May 29, 2000
From: Ángel Valdés
As far as we know there are only three species of Dendrodoris in the Northeastern Atlantic. I would not recommend to identify species based solely on the external morphology, but there are several characteristics that can give us a few clues.
UPPER RIGHT: Dendrodoris limbata (Cuvier, 1804) is endemic to the Mediterranean Sea. It is characterized by having a narrow mantle margin and a yellow (or whitish) line around the mantle edge. Some specimens are spotted and some are completely black, but all of them have the yellow line I mentioned. PHOTO: Conxita Avila.
LOWER LEFT: Dendrodoris grandiflora (Rapp, 1827) lives in the Mediterranean Sea and Northeastern Atlantic, from Northern Portugal to the Canary Islands. It is in general a dark, reddish, yellowish, greenish or brownish species with dark spots on the dorsum. In general it has dark striations on the mantle margin. It never has a yellow line on the mantle edge. PHOTO: Conxita Avila.
LOWER RIGHT: Dendrodoris herytra Valdés & Ortea, 1996 appears to be absent from the Mediterranean Sea, but it is the most widespread species in the Northeastern Atlantic. It lives from the coast of France to Canary Islands, Madeira and Azores. It is characterized by having a very small gill, and in general it is a red or reddish species. Some specimens can be greenish with dark spots, but the branchial leaves are always very short. PHOTO: Angel Valdes.
Juveniles of all Atlantic species of Dendrodoris, except D. limbata are uniformly red. I suspect specimens keep changing colors during their whole life, depending on what they eat. However, it is common to find under the same rock specimens of the same species with very different colorations.
The reproductive system, and especially the penial hooks are clearly different between these three species. As most of the visitors of the Sea Slug Forum know, species of Dendrodoris do not have a radula, and that makes the taxonomy of this group much more difficult.
I hope this will help.
Valdes, A., 2000 (May 29) Northeastern Atlantic Dendrodoris species. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/2461
Re: Dendrodoris grandiflora from the Mediterranean
From: Dominique Horst, April 3, 2009
Dendrodoris grandiflora from southern Portugal
From: Carlos M. L. Afonso, July 13, 2006
Dendrodoris grandiflora from Turkey
From: Ferda Buyukbaykal, October 12, 2003
Dendrodoris grandiflora from the Mediterranean
From: Marina Poddubetskaia, August 1, 2002
Dendrodoris grandiflora from Spain
From: Miquel Pontes, May 14, 2001
Dendrodoris from the Canary Ids
From: Ángel Valdés, May 26, 2000
Re: Dendrodoris from Canary Ids
From: Juan Lucas Cervera, May 26, 2000
Dendrodoris from Canary Ids
From: Eriwn Koehler, May 25, 2000