Summary for Eratigena saeva (Araneae)
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About this speciesRecorded altitude range
0m to 320m
Bolzern et al. (2013) proposed that Tegenaria atrica, T. saeva and T. gigantea (= T. duellica) should be placed (together with T. agrestis and T. picta amongst British spiders) in a new genus, Eratigena. They further proposed that E. atrica, E. saeva and E. gigantea represented just one species, E. atrica. While the transfer to a new genus is justified, the collapse of the three species into one is definitely not (see Oxford & Bolzern 2018 for details). Here the genus Tegenaria, and gigantea rather than duellica, are retained until the SRS master list is updated.
T. saeva is widespread in the west country, Wales and northern England, but more sporadic in Scotland. In mainland Europe its distribution is approximately the same as for T. gigantea. In southern and central England and Wales, the distribution of this species is almost complementary to that of T. gigantea with only a relatively narrow band of overlap, where rare hybridisation occurs (see T. gigantea)(Croucher et al. 2007; Oxford & Croucher 2014). Records outside the expected range can be genuine but telling the species apart can be tricky, especially in the overlap zone, and hybrids might be misidentified (Oxford 2008).
Habitat and ecology
The habitat and ecology of this species seems to be identical to that of T. gigantea (q.v.)
Very common where it occurs, but perhaps less so in Scotland.
Author of profile: Geoff Oxford.
Bolzern, A., Burckhardt, D. & Hänggi, A. 2013. Phylogeny and taxonomy of European funnel-web spiders of the Tegenaria-Malthonica complex (Araneae: Agelenidae) based upon morphological and molecular data. Zool. J. Linn. Soc. 168: 723–848.
Croucher, P. J. P. et al. (2007) Contrasting patterns of hybridisation in large house spiders (Tegenaria atrica group, Agalenidae). Evolution 61: 1622–1640.
Oxford, G. S. (2008). Identification of Tegenaria gigantea and T. saeva. Newsl. Br. arachnol. Soc. 113: 21–23.
Oxford, G. S. & Bolzern, A. 2018 Molecules v. morphology - is Eratigena atrica (Araneae: Agelenidae) one species or three? Arachnology 17: 337-357.
Oxford, G. S. & Croucher, P. J. P. 2014. Many a slip: dissecting the causes of reproductive isolation in two species of Tegenaria (Agelenidae). Biol. J. Linn. Soc. 113: 355–367.
Account last edited by Geoff Oxford at 16:20 on Fri 22nd Jun 2018.
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