AraneaeThomisidae – Crab Spiders

Tan crab spider

Xysticus ferox

This record describes Xysticus ferox (species). Recorded family: Thomisidae. Recorded order: Araneae.

Identification and Appearance

Tan crab spider - Xysticus ferox
(c) Sheila S, some rights reserved (CC BY). https://creativecommons.org/licenses/by/4.0/ Source: https://www.inaturalist.org/observations/388619189

Xysticus ferox, the brown crab spider, is a species of crab spider in the family Thomisidae. It is found in the USA and Canada.

Identification notes

FeatureDetails
Femaleepigyne
Maleleft palp, ventral view left palp, retrolateral view

Wikipedia reference for Xysticus ferox: https://en.wikipedia.org/wiki/Xysticus ferox.

Classification

Kingdom
Animalia
Phylum
Arthropoda
Class
Arachnida
Order
Araneae (Spiders)
Family
Thomisidae (Crab Spiders)
Genus
Xysticus (Ground Crab Spiders)

Imported taxonomy record. Source availability varies; see the source references and editorial policy below.

Additional species information

Species notes from the sources

Etymology: (Hentz, 1847)

About Spiders: the wider group

Order-level background for Araneae, the group containing Xysticus ferox. 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.

Explore Araneae families and species →

Photos of Tan crab spider (10)

Tan crab spider - photo 1
(c) Sheila S, some rights reserved (CC BY). https://creativecommons.org/licenses/by/4.0/ Source: https://www.inaturalist.org/observations/388619189
Tan crab spider - photo 2
(c) Rafael Enrique Baez Segui, some rights reserved (CC BY-NC), uploaded by Rafael Enrique Baez Segui | (c) Timothy Lindsey, some rights reserved (CC BY), uploaded by Timothy Lindsey | (c) Matthew Lindsey, all rights reserved, uploaded by Matthew Lindsey | (c) Justin Williams, some rights reserved (CC BY), uploaded by Justin Williams | (c) Steve Kerr, some rights reserved (CC BY), uploaded by Steve Kerr | (c) WanderingMogwai, some rights reserved (CC BY-NC), uploaded by WanderingMogwai | Contributed by John R. Maxwell; Additional contributions by Lynette Elliott , jsloan
Tan crab spider - photo 3
(c) Rafael Enrique Baez Segui, some rights reserved (CC BY-NC), uploaded by Rafael Enrique Baez Segui | (c) Timothy Lindsey, some rights reserved (CC BY), uploaded by Timothy Lindsey | (c) Matthew Lindsey, all rights reserved, uploaded by Matthew Lindsey | (c) Justin Williams, some rights reserved (CC BY), uploaded by Justin Williams | (c) Steve Kerr, some rights reserved (CC BY), uploaded by Steve Kerr | (c) WanderingMogwai, some rights reserved (CC BY-NC), uploaded by WanderingMogwai | Contributed by John R. Maxwell; Additional contributions by Lynette Elliott , jsloan
Tan crab spider - photo 4
(c) Rafael Enrique Baez Segui, some rights reserved (CC BY-NC), uploaded by Rafael Enrique Baez Segui | (c) Timothy Lindsey, some rights reserved (CC BY), uploaded by Timothy Lindsey | (c) Matthew Lindsey, all rights reserved, uploaded by Matthew Lindsey | (c) Justin Williams, some rights reserved (CC BY), uploaded by Justin Williams | (c) Steve Kerr, some rights reserved (CC BY), uploaded by Steve Kerr | (c) WanderingMogwai, some rights reserved (CC BY-NC), uploaded by WanderingMogwai | Contributed by John R. Maxwell; Additional contributions by Lynette Elliott , jsloan
Tan crab spider - photo 5
(c) Rafael Enrique Baez Segui, some rights reserved (CC BY-NC), uploaded by Rafael Enrique Baez Segui | (c) Timothy Lindsey, some rights reserved (CC BY), uploaded by Timothy Lindsey | (c) Matthew Lindsey, all rights reserved, uploaded by Matthew Lindsey | (c) Justin Williams, some rights reserved (CC BY), uploaded by Justin Williams | (c) Steve Kerr, some rights reserved (CC BY), uploaded by Steve Kerr | (c) WanderingMogwai, some rights reserved (CC BY-NC), uploaded by WanderingMogwai | Contributed by John R. Maxwell; Additional contributions by Lynette Elliott , jsloan
Tan crab spider - photo 6
(c) Rafael Enrique Baez Segui, some rights reserved (CC BY-NC), uploaded by Rafael Enrique Baez Segui | (c) Timothy Lindsey, some rights reserved (CC BY), uploaded by Timothy Lindsey | (c) Matthew Lindsey, all rights reserved, uploaded by Matthew Lindsey | (c) Justin Williams, some rights reserved (CC BY), uploaded by Justin Williams | (c) Steve Kerr, some rights reserved (CC BY), uploaded by Steve Kerr | (c) WanderingMogwai, some rights reserved (CC BY-NC), uploaded by WanderingMogwai | Contributed by John R. Maxwell; Additional contributions by Lynette Elliott , jsloan
Tan crab spider - photo 7
(c) Rafael Enrique Baez Segui, some rights reserved (CC BY-NC), uploaded by Rafael Enrique Baez Segui | (c) Timothy Lindsey, some rights reserved (CC BY), uploaded by Timothy Lindsey | (c) Matthew Lindsey, all rights reserved, uploaded by Matthew Lindsey | (c) Justin Williams, some rights reserved (CC BY), uploaded by Justin Williams | (c) Steve Kerr, some rights reserved (CC BY), uploaded by Steve Kerr | (c) WanderingMogwai, some rights reserved (CC BY-NC), uploaded by WanderingMogwai | Contributed by John R. Maxwell; Additional contributions by Lynette Elliott , jsloan
Tan crab spider - photo 8
(c) Rafael Enrique Baez Segui, some rights reserved (CC BY-NC), uploaded by Rafael Enrique Baez Segui | (c) Timothy Lindsey, some rights reserved (CC BY), uploaded by Timothy Lindsey | (c) Matthew Lindsey, all rights reserved, uploaded by Matthew Lindsey | (c) Justin Williams, some rights reserved (CC BY), uploaded by Justin Williams | (c) Steve Kerr, some rights reserved (CC BY), uploaded by Steve Kerr | (c) WanderingMogwai, some rights reserved (CC BY-NC), uploaded by WanderingMogwai | Contributed by John R. Maxwell; Additional contributions by Lynette Elliott , jsloan

Photo credits: (c) Rafael Enrique Baez Segui, some rights reserved (CC BY-NC), uploaded by Rafael Enrique Baez Segui | (c) Timothy Lindsey, some rights reserved (CC BY), uploaded by Timothy Lindsey | (c) Matthew Lindsey, all rights reserved, uploaded by Matthew Lindsey | (c) Justin Williams, some rights reserved (CC BY), uploaded by Justin Williams | (c) Steve Kerr, some rights reserved (CC BY), uploaded by Steve Kerr | (c) WanderingMogwai, some rights reserved (CC BY-NC), uploaded by WanderingMogwai | Contributed by John R. Maxwell; Additional contributions by Lynette Elliott , jsloan

How we use and review source data. Source count does not imply independent verification.

Photo credits: (c) Rafael Enrique Baez Segui, some rights reserved (CC BY-NC), uploaded by Rafael Enrique Baez Segui | (c) Timothy Lindsey, some rights reserved (CC BY), uploaded by Timothy Lindsey | (c) Matthew Lindsey, all rights reserved, uploaded by Matthew Lindsey | (c) Justin Williams, some rights reserved (CC BY), uploaded by Justin Williams | (c) Steve Kerr, some rights reserved (CC BY), uploaded by Steve Kerr | (c) WanderingMogwai, some rights reserved (CC BY-NC), uploaded by WanderingMogwai | Contributed by John R. Maxwell; Additional contributions by Lynette Elliott , jsloan. Contributors retain copyright over their individual contributions.