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Taxon profile

species

Caribbean Risso
Rissoella caribaea Rehder, 1943

kingdom Animalia - animals »  phylum Mollusca - mollusks »  class Gastropoda - gastropods »  order Allogastropoda »  family Rissoellidae »  genus Rissoella

Images

Rissoella caribaea - Caribbean Risso

Author: Caballer Gutierrez et al

Rissoella caribaea - Caribbean Risso

Author: Caballer Gutierrez et al

Rissoella caribaea - Caribbean Risso

Author: Caballer Gutierrez et al

Taxon in country check-lists*

* List of countries might not be complete

Interchangeable taxa

The 3 pictures (2 tables and 1 key of Caribic Rissoellae) make it easier to differentiate the caribic species of Rissoella.

Species from this family belonging to the genus Rissoella have low dispersal abilities because of the absence of a pelagic larval stage. They are usually found in very specific habitats (Ortea and Espinosa 2004) and they tend to be microendemic, although their small size could facilitate passive transport in floating elements covered by algae. There¬fore, their distribution should be established solely on the basis of publications that pro¬vide sufficient data for unambiguous identification. Concluding from this, most of the historical records of Rissoella species in Western Atlantic have to be considered doubtful.
In the Caribbean Sea, R. caribaea is the most controversial species with the widest known distribution (Ortea and Espinosa 2004). The original description of R. caribaea by Rehder (1943) did not allow to distinguish it from other species of the genus in the West Atlantic, but Wise (1998) compared his specimens from Florida with the holotype of this species (USNM No. 536046) and published a detailed redescription. According to him, R. caribaea has a deep and narrow umbilicus without preumbilical cord, several strands or streaks of uniform height leaving from the umbilicus, a charac¬teristic and prominent keel, bifid nose, gray-black body and hypobranchial gland, the last surrounded by a yellow ribbon with transverse bands, and a radula with 30 rows of serrated teeth. Although there is some theoretical geographic overlap, these characters clearly separate it from R. morrocoyensis and R. venezolanicola
Caballer Gutierrez, M. , Ortea, J. & Narciso, S.,2011. Description of two new species of Rissoella Gray, 1847 (Mollusca, Gastropoda, Heterobranchia) from Venezuela, with a key to the Caribbean species known for the genus
Author: Jan Delsing

Links and literature

EN Galli C.: WMSDB - Wolrdwide Mollusc Species Data Base July 10, 2013 [http://www.bagniliggia.it/WMSD/WMSDhome....] [as Rissoella caribaea Rehder, 1943]
Data retrieved on: 23 November 2013

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