Theridiidae: Cobweb Spiders

More Spider Resources Black Widow Spider False Widow Spider Types of Spiders

The Theridiidae, generally known as cobweb spiders or comb-footed spiders, are a large family of spiders covering approximately two dozen genera and a couple hundred species in the United States.

Most people would not give Theridiidae a second thought were it not for the presence of the widow spiders (Latrodectus genus) and their poisonous bites.

The bites of other Theridiidae species are not categorized as poisonous, although the bite of the false widow (Steatoda genus) can cause pain for some sensitive individuals.

Apart from their medical prominence, the Theridiidae also consists of a social spider genus, Anelosimus, with Anelosimus studiosus a common species along the Southeast and Gulf Coast areas. Females are known to congregate in webs of local trees and shrubs, collectively protecting their egg sacs and rearing young spiderlings.

Marvel comics relates the tale of another Theriddidae claim to fame for the Achaeranea genus by confirming the fact that the common house spider (Achaearanea tepidariorum) bit Peter Parker, leading to his second career as Spiderman.

The top picture shows a species in the Enoplognatha genus. Outside the web, Theridiidae species can be initially identified by their round abdomens and long pair of front legs.

© 2008-2009. Patricia A. Michaels