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Phylogenetic relationships elucidate colonization patterns in the intertidal grazers Osilinus Philippi, 1847 and Phorcus Risso, 1826 (Gastropoda: Trochidae) in the northeastern Atlantic Ocean and Mediterranean Sea

Donald, Kirsten M., Preston, Joanne, Williams, Suzanne T., Reid, David G., Winter, David, Alvarez, Raquel, Buge, Barbara, Hawkins, Stephen J., Templado, Jose and Spencer, Hamish G. (2012) Phylogenetic relationships elucidate colonization patterns in the intertidal grazers Osilinus Philippi, 1847 and Phorcus Risso, 1826 (Gastropoda: Trochidae) in the northeastern Atlantic Ocean and Mediterranean Sea Molecular Phylogenetics and Evolution, 62, (1), pp. 35-45. (doi:10.1016/j.ympev.2011.09.002).

Record type: Article

Abstract

Snails in the closely related trochid genera Phorcus Risso, 1826 and Osilinus Philippi, 1847 are ecologically important algal grazers in the intertidal zone of the northeastern Atlantic Ocean and Mediterranean Sea. Here we present the first complete molecular phylogeny for these genera, based on the nuclear 28S rRNA gene and the mitochondrial 16S rRNA and COI genes, and show that the current classification is erroneous. We recognize nine species in a single genus, Phorcus: estimated by BEAST analysis, this arose 30 (±10) Ma; it consists of two subgenera, Phorcus and Osilinus, which we estimate diverged 14 (±4.5) Ma. Osilinus kotschyi, from the Arabian and Red Seas, is not closely related and is tentatively referred to Priotrochus Fischer, 1879. Our phylogeny allows us to address biogeographical questions concerning the origins of the Mediterranean and Macaronesian species of this group. The former appear to have evolved from Atlantic ancestors that invaded the Mediterranean on several occasions after the Zanclean Flood, which ended the Messinian Salinity Crisis 5.3 Ma; whereas the latter arose from several colonizations of mainland Atlantic ancestors within the last 3 (±1.5) Ma.

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Published date: 2012
Keywords: Atlantic, Dispersal, Mediterranean, Osilinus, Phorcus, Priotrochus, Tethyan realm
Organisations: Ocean Biochemistry & Ecosystems

Identifiers

Local EPrints ID: 337007
URI: http://eprints.soton.ac.uk/id/eprint/337007
ISSN: 1055-7903
PURE UUID: 3fe97182-e105-4c5c-972d-64158a4faf4c

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Date deposited: 13 Apr 2012 12:20
Last modified: 18 Jul 2017 06:05

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Contributors

Author: Kirsten M. Donald
Author: Joanne Preston
Author: Suzanne T. Williams
Author: David G. Reid
Author: David Winter
Author: Raquel Alvarez
Author: Barbara Buge
Author: Jose Templado
Author: Hamish G. Spencer

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