Tropical Atlantic [Brazil to Caribbean, West Africa]; East Pacific from Mexico to Peru.
9mm long. Playa Mismaloya, Bahia de Banderas, Pacific Coast of Mexico at 17 feet of depth under a rock on April 22nd, 2002. Photo: Alicia Hermosillo.
The translucent white mantle is covered with orange-red spots. In some animals the spots are of similar size all over, while in others the spots around the margin are much larger than those in the central region. There is a band of small mantle glands around the edge and an inner band of larger glands. The glands are hidden by the orange spots. The species was moved from Cadlina to Tyrinna on anatomical grounds (Rudman, 1984).
The main difference between T. evelinae and the similarly coloured T. nobilis would appear to be that in T. nobilis the orange spots are absent from the central region of the mantle between the gills and the rhinophores. Their goegraphic distributions also seem to be mutually exclusive, with T. nobilis being found in the cold waters of the southern part of Sth America, while T. evelinae replaces it in the warmer north from Mexico to Peru on the Pacific coast, and from the Caribbean to sthn Brazil on the Atlantic coast. It has also been reported from west Africa.
A possible third species of Tyrinna, Cadlina burnayi Ortea, 1988 was shown (Valdés & Afonso, 2003) to be a synonym of T. evelinae.
- Marcus, Er. (1958) On western Atlantic opisthobranchiate gastropods. American Museum Novitates, 1906: 1-82.
- Muniain, C., A. Valdés, et al. (1996). Redescription of Tyrinna nobilis Bergh,1898 (Opisthobranchia: Chromodorididae) from Patagonia, Argentina. Journal of Molluscan Studies 62: 265-273.
- Rudman, W.B. (1984) The Chromodorididae (Opisthobranchia: Mollusca) of the Indo-West Pacific: a review of the genera. Zoological Journal of the Linnean Society, 81: 115-273.
- Schroedl, M. and S. V. Millen (2001). Revision of the nudibranch gastropod genus Tyrinna Bergh, 1898 (Doridoidea: Chromodorididae). Journal of Natural History 35(8): 1143-1171.
- Thompson, T.E. (1980) Jamaican Opisthobranch Molluscs II. Journal of Molluscan Studies, 46: 74-99
- Valdés, A. and C. M. L. Afonso (2003). Synonymy of Cadlina burnayi Ortea, 1988, from the Cape Verde Islands (Opisthobranchia: Chromodorididae) with Tyrinna evelinae (Marcus, 1958). The Veliger 46(2): 176-179.
Rudman, W.B., 2009 (November 18) Tyrinna evelinae (Marcus, 1958). [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/tyrievel
June 1, 2010
From: Alvaro Borba
Here is the first record of Tyrinna evelinae from northeastern Brazil. Before this, the species was found only in the Caribbean and southeastern Brazil (Rio de Janeiro and Sao Paulo).
Locality: Morro de Camaragibe beach, Passo de Camaragibe City, Alagoas, Maceió, South Atlantic Ocean, 06 May 2010, 1.5 metres, under rocks along with algae and sponges. Length: 20 mm. Photographer: Alvaro Borba.
email@example.comBorba, A.G., 2010 (Jun 1) Tyrinna evelinae from Northeastern Brazil.. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/23684
Thanks for the record. I guess the lack of records between Rio de Janeiro and the Caribbean reflect a lack of research workers in the region rather than the recent arrival of Tyrinna evelinae.It is good to 'fill gaps' like this.
If all the animals we identify as T. evelinae are the same species, it has a very wide distribution being found in the tropical Atlantic [Brazil to Caribbean, West Africa] and the eastern Pacific from Mexico to Peru.
July 12, 2007
From: Armando de Luca
I don't know this species and can't find anything about it in Sea Slug Forum
Locality: Laje de Santos Marine State Park, Sao Paulo State, Brazil;
depth: 28 meters; water temperature: 20ºC; visibility: 15 meters; animal
lenght: 1 cm; rocky bottom with algae; 23 June 2007; Photo: Armando de Luca Junior.
Armando de Luca Junior
firstname.lastname@example.org Luca, A., 2007 (Jul 12) Tyrinna evelinae from Brazil. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/20075
This is Tyrinna evelinae. It is nice to get another record from the place where it was first discovered.
December 6, 2005
From: Vinicius Padula
Here are some photos of Tyrinna evelinae from the Brazilian coast.
Locality: Rio de Janeiro, Brazil. South Atlantic Ocean. Depth: 2 metres. Length: 20 mm. 03 January 2005. Photographer: Vinicius Padula
Padula, V., 2005 (Dec 6) Tyrinna evelinae from Rio de Janeiro. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/15405
This species was originally described from Brazil so it is nice to get photos of a Brazilian animal. It certainly has a wide distribution in the Atlantic and the East Pacific
August 11, 2003
From: Nelsy Rivero
Hi. Dr. Rudman
Here is a picture taken in Parque Nacional Morrocoy, Venezuela, in February 2003. I would like to obtain more information about this species.
Depth: 3 m
Size: 1 cm
Thank very much
email@example.comRivero, N., 2003 (Aug 11) Tyrinna evelinae from Venezuela. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/10701
This is another interesting find. Tyrinna evelinae is one of a group of opisthobranchs which are found on both sides of the Isthmus of Panama. It is also reported from Ghana, on the west African coast. There are very few records of this species - Ghana , Brazil , Caribbean [2-3], East Pacific [3-4] - so your record is an important addition to our knowledge. Any futher information on its behaviour or biology would be of interest
May 21, 2002
From: Ali Hermosillo
Dear Dr. Rudman,
This 9mm Tyrinna evelinae was found in Playa Mismaloya, Bahia de Banderas, Pacific Coast of Mexico at 17 feet of depth under a rock on April 22nd.
I have so far found 3 more: in Islas Marietas (north of the Bay) and Chimo (south of the Bay) and they were not under rocks, but crawling on the walls. Some individuals show yellow-brownish blotches on their bodies [see separate message], which I have seen make them look like a piece of broken shell (well, that is my appreciation anyways).
Hermosillo, A., 2002 (May 21) Tyrinna evelinae from Bahia de Banderas. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/6996
Thanks for these photos. This species has a wide distribution from Brazil to the Caribbean, Ghana and the Pacific coast of central America. It will be interesting when you get some information on its biology as we know very little about the gemus Tyrinna.
May 21, 2002
From: Ali Hermosillo
firstname.lastname@example.orgHermosillo, A., 2002 (May 21) Tyrinna evelinae from Bahia de Banderas. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/6997