Robertus

Robertus lividus, from here.

Belongs within: Theridiidae.

Robertus is a primarily Holarctic genus of cobweb spiders with a plain-coloured opisthosoma. Males have only small marginal teeth on the chelicerae; females have two teeth on the rear margin of the cheliceral furrow (Wunderlich 1976). Members of this genus are commonly found in ground-level habitats such as among leaf litter, moss or grasses, or under stones.

<==Robertus Cambridge 1879GGG04 [incl. CteniumD90]
    |--R. arundineti (Cambridge 1871)W76
    |--R. frivaldszkyi (Chyzer 1894)W76
    |--R. grasshoffi Wunderlich 1973W76
    |--R. insignis Pick.-Cambridge 1907W76
    |--R. lividus (Blackwall 1836)W76
    |--R. lyrifer Holm 1939W76
    |--R. mazaurici (Simon 1901)W76
    |--R. neglectus (Pick.-Cambridge 1871)W76
    |--R. ripariusJVHN90
    |--R. scoticus Jackson 1914 [incl. R. monticola Simon 1914]W76
    |--R. truncorum (Koch 1872)W76
    `--R. ungulatus Vogelsanger 1944 [incl. R. paradoxus Miller 1967]W76

*Type species of generic name indicated

References

[D90] Dondale, C. D. 1990. Litter Araneae (Araneida). In: Dindal, D. L. (ed.) Soil Biology Guide pp. 477–502. John Wiley & Sones: New York.

[GGG04] Garb, J. E., A. González & R. G. Gillespie. 2004. The black widow spider genus Latrodectus (Araneae: Theridiidae): phylogeny, biogeography, and invasion history. Molecular Phylogenetics and Evolution 31: 1127–1142.

[JVHN90] Jennings, D. T., W. M. Vander Haegen & A. M. Narahara. 1990. A sampling of forest-floor spiders (Araneae) by expellant, Moosehorn National Wildlife Refuge, Maine. Journal of Arachnology 18: 173–180.

[W76] Wunderlich, J. 1976. Zur Spinnenfauna Deutschlands, XVI. Zur Kenntnis der mitteleuropäischen Arten der Gattungen Enoplognatha Pavesi und Robertus O. Pick.-Cambridge (Araneida: Theridiidae). Senckenbergiana Biologica 57 (1–3): 97–112.

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