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A new species of Allogenus (Tricladida, Maricola, Uteriporidae) from South Georgia, Sub-Antarctica

Published online by Cambridge University Press:  04 December 2013

Odile Volonterio*
Affiliation:
Sección Zoología de Invertebrados, Facultad de Ciencias, Universidad de la República, Iguá 4225, piso 8 sur, Montevideo, Uruguay
Paul E. Brewin
Affiliation:
Shallow Marine Surveys Group, PO Box 598, Stanley, Falkland Islands, FIQQ 1ZZ, South Atlantic Department of Natural Resources–Fisheries, Falkland Islands Government, By-Pass Rd, Stanley, Falkland Islands, FIQQ 1ZZ, South Atlantic
*
Correspondence should be addressed to: O. Volonterio, Sección Zoología de Invertebrados, Facultad de Ciencias, Universidad de la República, Iguá 4225, piso 8 sur, Montevideo, Uruguay email: o.volonterio@outlook.com

Abstract

South Georgia is a remote sub-Antarctic island, considered a marine biodiversity ‘hotspot’ in the Southern Ocean. During a survey along the north coast of South Georgia several marine planarians were found. One of the specimens was a new species of Allogenus (Uteriporidae), which is described here as Allogenus sluysi sp. nov. The new species has the characteristics of the genus and can be distinguished from the type and only known species, Allogenus kerguelensis, by its smaller size, blackish-brown pigmentation, presence of three retinal cells in each eye cup, position of its testes half-way between the ventral and dorsal body surfaces or at a slightly more ventral position, and by having an ejaculatory duct that opens centrally at the tip of the penis papilla. The presently known geographical distribution of Allogenus, the heterogeneous marine planarian species composition in South Georgia, and the distribution of these species in this region are in agreement with a previously proposed vicariance hypothesis, albeit that dispersal cannot be ruled out.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 2013 

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