Agelenids of the World

Systematics and Taxonomy of Agelenidae, a Worldwide distributed Spider Family

Mitochondrial differentiation, introgression and phylogeny of species in the Tegenaria atrica group (Araneae: Agelenidae)

Publication Type:Journal Article
Year of Publication:2004
Authors:P. J. P. Croucher, Oxford, G. S., Searle, J. B.
Journal:Biological Journal of the Linnean Society
Date Published:2004
ISBN Number:0024-4066
Keywords:[Molecular genetics / / ] [Hybridization / / Introgression evidence], [Phylogeny / Molecular phylogeny / ] [Biochemical variation / / ]., Biochemistry, Evolution, Genetics, mtDNA sequences / Introgression evidence & phylogenetic implications], Systematics, Tegenaria atrica, Tegenaria atrica (Araneae)., Tegenaria gigantea, Tegenaria gigantea (Araneae)., Tegenaria saeva (Araneae)., Tegenaria saeva [Nucleic acids /, Variation

The relationships between the three members of the Tegenaria atrica group (T. atrica, T. saeva and T. gigantea) were examined with DNA sequence data from mitochondrial CO1, 16S rRNA, tRNAleu(CUN) and ND1 genes. Members of this group of large house spiders have overlapping distributions in western Europe and hybridize with each other to a variable degree. The close relatedness of all three species was supported by all analyses. T. saeva and T. gigantea are more closely affiliated than either is to T. atrica. Haplotypes clearly assignable to T. gigantea were also present in many specimens of T. saeva, suggesting asymmetrical introgression of mtDNA from T. gigantea into T. saeva. Molecular clock calibrations (CO1) suggest that deeper divisions within the genus Tegenaria may be in excess of 10 million years old, and that the evolutionary history of the T. atrica group has been moulded by Quaternary glacial-interglacial cycles.

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