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Cribellate Orb Weaver
Uloborus plumipes
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Arachnida
Order: Araneae
Suborder: Araneomorphae
Superfamily: Uloboroidea
Family: Uloboridae
Thorell, 1869
18 genera, 262 species

Uloboridae, the cribellate orb weavers or hackled orb weavers, is a family of non-venomous spiders. Their lack of venom glands is a secondarily evolved trait. Instead, they kill their prey by crushing with over 140 metres of thread.

All members of this family produce a feathery, fuzzy silk called cribellate (or hackled) silk.[1] These spiders do not use an adhesive on their orb webs, but rather the very fine fibers on each strand of silk tend to ensnare prey. Uloboridae webs often have a stabilimentum or zig-zag pattern through the center.


This family has an almost worldwide distribution. There are only two species known from northern Europe: Uloborus walckenaerius and Hyptiotes paradoxus. Similarly occurring solely in northern North America (e.g. southern Ontario) is Uloborus glomosus.


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  1. ^ Jonathan A. Coddington & Herbert W. Levi (1991). "Systematics and evolution of spiders (Araneae)" (PDF). Annual Review of Ecology and Systematics 22: 565–592. doi:10.1146/annurev.ecolsys.22.1.565. JSTOR 2097274. 

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