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True Spider Orb Weaver Uloboridae Araneae from Colorado

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True Spider Orb Weaver Uloboridae Araneae from Colorado

Availability: In stock

Uloboridae (Orb Weaver Spider)

Age : Eocene ( 49 Ma)
Formation : Parachute Creek Member / Green River Formation
Locality : Hawes Quarry, Rio Blanco, Colorado

Spider : 0.7 x 0.8 cm

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. 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.


The Green River Formation is famous worldwide for its fossil fish and other associated fauna (reptiles, birds, mammals, & plants). The Green River Fm. also provides us a rare snapshot glimpse into life 49 million years ago.

The preservation of the fossil insects in the Hawes Quarry are just spectacular, some good enough to allow not only identification to family and subfamily, but will sometimes show color patterns, wing venation, and sex-related characters.

This fossil specimen was collected by William Hawes, from his quarry, the Hawes Quarry, in Rio Blanco County, Colorado. The Hawes Quarry has produced some of the most amazingly beautiful insect fossils from the Green River Fm. and these represent the hand selected, choice picks, from Hawes years of collecting in the mountains of Colorado.

Specimen will come with an identification card.

Scientific Classification :
Kingdom:    Animalia
Phylum:    Arthropoda
Class:    Arachnida
Order:    Araneae
Suborder:    Araneomorphae
Superfamily:    Uloboroidea
Family:    Uloboridae (Thorell, 1869)