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Genus Tidarren

Tidarren sisyphoides - female Tidarren haemorrhoidale - female Tidarren haemorrhoidale - male voucher images - Tidarren sisyphoides - female voucher images - Tidarren sisyphoides - female voucher images - Tidarren sisyphoides - female voucher images - Tidarren sisyphoides - male Tidarren sisyphoides? - Tidarren sisyphoides
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Chelicerata (Chelicerates)
Class Arachnida (Arachnids)
Order Araneae (Spiders)
Infraorder Araneomorphae (True Spiders)
No Taxon (Entelegynae)
Family Theridiidae (Cobweb Spiders)
Genus Tidarren
Explanation of Names
A Gosiute-Greek combination meaning 'small male'(1).
Numbers
2 species in BugGuide's range (North American north of Mexico).
Identification
Seems to come in a variety of shades, but always present is a conspicuous white line that runs vertically from the highest point of the abdomen all the way down to the spinnerets.
Range
Tidarren haemorrhoidale:
Tidarren sisyphoides:
Remarks
The tiny males of this genus only have one pedipalp, and it is disproportionally large!


Also, the females typically use debris to construct a retreat within their cobweb. They will also hide their egg sac(s) in there.
Works Cited
1.Spiders of North America: An Identification Manual
D. Ubick, P. Paquin, P.E. Cushing and V. Roth (eds). 2005. American Arachnological Society.