Tri-locus sequence data reject a “Gondwanan origin hypothesis” for the African/South Pacific crab genus Hymenosoma

Teske, P.R. and McLay, C.L. and Sandoval-Castillo, J. and Papadopoulos, I. and Newman, B.K. and Griffiths, C.L. and McQuaid, C.D. and Barker, N.P. and Borgonie, G. and Beheregaray, L.B. (2009) Tri-locus sequence data reject a “Gondwanan origin hypothesis” for the African/South Pacific crab genus Hymenosoma. Molecular Phylogenetics and Evolution, 53 (1). pp. 23-33. ISSN 1055-7903



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Crabs of the family Hymenosomatidae are common in coastal and shelf regions throughout much of the southern hemisphere. One of the genera in the family, Hymenosoma, is represented in Africa and the South Pacific (Australia and New Zealand). This distribution can be explained either by vicariance (presence of the genus on the Gondwanan supercontinent and divergence following its break-up) or more recent transoceanic dispersal from one region to the other. We tested these hypotheses by reconstructing phylogenetic relationships among the seven presently-accepted species in the genus, as well as examining their placement among other hymenosomatid crabs, using sequence data from two nuclear markers (Adenine Nucleotide Transporter [ANT] exon 2 and 18S rDNA) and three mitochondrial markers (COI, 12S and 16S rDNA). The five southern African representatives of the genus were recovered as a monophyletic lineage, and another southern African species, Neorhynchoplax bovis, was identified as their sister taxon. The two species of Hymenosoma from the South Pacific neither clustered with their African congeners, nor with each other, and should therefore both be placed into different genera. Molecular dating supports a post-Gondwanan origin of the Hymenosomatidae. While long-distance dispersal cannot be ruled out to explain the presence of the family Hymenosomatidae on the former Gondwanan land-masses and beyond, the evolutionary history of the African species of Hymenosoma indicates that a third means of speciation may be important in this group: gradual along-coast dispersal from tropical towards temperate regions, with range expansions into formerly inhospitable habitat during warm climatic phases, followed by adaptation and speciation during subsequent cooler phases.

Item Type:Article
Uncontrolled Keywords:18S rDNA; Africa; ANT gene exon 2; Australia; Crown crab; Majoidea; Molecular dating; mtDNA; New Zealand; Parapatric speciation; Spider crab
Subjects:Y Unknown > Subjects to be assigned
Divisions:Faculty > Faculty of Science > Botany
Faculty > Faculty of Science > Zoology & Entomology
ID Code:1456
Deposited By: Mrs Eileen Shepherd
Deposited On:01 Sep 2009
Last Modified:06 Jan 2012 16:20
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