Callobius nomeus
This record describes Callobius nomeus (species). Recorded family: Amaurobiidae. Recorded order: Araneae.
Identification and Appearance

Callobius nomeus is a species of hacklemesh weaver in the spider family Amaurobiidae. It is found in the United States and Canada. Specifically this species is associated with tree bark.
Identification notes
Epigynum
Wikipedia reference for Callobius nomeus: https://en.wikipedia.org/wiki/Callobius nomeus.
Classification
- Kingdom
- Animalia
- Phylum
- Arthropoda
- Class
- Arachnida
- Order
- Araneae (Spiders)
- Family
- Amaurobiidae (Hacklemesh Weavers)
- Genus
- Callobius
Imported taxonomy record. Source availability varies; see the source references and editorial policy below.
Habitat and Range
Geographic Range
Newfoundland west across Canada to British Columbia and south in the mountains of the west to Oregon and New Mexico.
Additional species information
Species notes from the sources
Etymology: Author: Chamberlin, 1919
About Spiders: the wider group
Order-level background for Araneae, the group containing Callobius nomeus. Species-specific details appear above.
Group overview
As of 2023, 51,673 spider species in 136 families have been recorded, though an estimated 150,000 species exist. Spiders rank 7th in total species diversity among all organism orders. Only 0.5% of spider species pose any risk to human health.
Ecological role of the group
Spider venom contains complex peptides with diverse pharmacological activities, making them valuable for drug development research. Spiders produce up to 7 types of silk from specialized glands. Spider silk genes have been inserted into mammals and plants for biotech applications.
Economic and practical significance of the group
The global spider community kills an estimated 400-800 million tons of prey annually (2017 study). Spiders provide billions of dollars in natural pest control for agriculture. Spider silk is 5× stronger than steel of the same diameter, driving a biomaterials research industry.
Recorded sources for this group: World Spider Catalog, PNAS, Nature, ScienceDirect. Imported estimates may describe particular regions or reporting periods.
Photos of Callobius nomeus (2)
Photo credits: (c) Thomas Barbin, some rights reserved (CC BY-NC), uploaded by Thomas Barbin | (c) Rod Crawford, some rights reserved (CC BY-NC), uploaded by Rod Crawford | Contributed by Charley Eiseman; Additional contributions by Lynette Elliott , cheins , jsloan
Frequently Asked Questions About Callobius nomeus
What is Callobius nomeus?
Callobius nomeus is a species in the family Amaurobiidae, within the order Araneae.
How big is Callobius nomeus?
Female body length = 11mm Male body length = 8mm
How do you identify Callobius nomeus?
Epigynum
Where is Callobius nomeus found?
Range: Newfoundland west across Canada to British Columbia and south in the mountains of the west to Oregon and New Mexico.
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