Firmicus (spider)

Firmicus
adult female F. bragantinus from South Africa
Kingdom:	Animalia
Phylum:	Arthropoda
Subphylum:	Chelicerata
Class:	Arachnida
Order:	Araneae
Infraorder:	Araneomorphae
Family:	Thomisidae
Genus:	FirmicusSimon, 1895
F. bragantinus(Brito Capello, 1866)
17, see text

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Firmicus is a genus of crab spiders that was first described by Eugène Simon in 1895.

Species in this genus are mainly found in Africa. One species is endemic to Vietnam, and another reaches into Spain and France from Algeria. F. dewitzi is found from Egypt to Iran.

Firmicus are free-living plant dwellers more commonly found on trees.

Females and males are 4 to 6 mm in total length, with males only slightly smaller.

This genus can be recognised by their flattened body that is frequently elongated. The carapace is flattened and narrower in the eye region. The tubercles of anterior lateral eyes are shallow and clearly larger than posterior lateral eye tubercles. The anterior lateral eyes are larger than the other eyes. The anterior eye row is straight with the eyes equidistantly spaced while the posterior eye row is recurved. The posterior median eyes are distinctly closer to each other than to posterior lateral eyes.

The abdomen is flattened and slightly elongated. Legs I and II are long, thick and spinous.

• F. abnormis
• F. bivittatus
• F. campestratus

As of October 2025, this genus includes seventeen species and two subspecies:

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In synonymy:

• F. marginatus Simon, 1897 = Firmicus insularis (Blackwall, 1877)

• List of Thomisidae species

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• Lessert, R. de (1919). "Araignées du Kilimandjaro et du Mérou (suite). 3. Thomisidae". Revue suisse de Zoologie. 27 (5): 99–234. doi:10.5962/bhl.part.36325.

• Lessert, R. de (1943). "Araignées du Congo Belg (III)". Revue suisse de Zoologie. 50: 305–338.

• Benoit, P. L. G. (1978). "Contributions à l'étude de la faune terrestre des îles granitiques de l'archipel des Séchelles (Mission P.L.G. Benoit - J.J. Van Mol 1972). Thomisidae (Araneae)". Revue Zoologique Africaine. 92: 899–901.

• Caporiacco, L. di (1947). "Arachnida Africae Orientalis, a dominibus Kittenberger, Kovács et Bornemisza lecta, in Museo Nationali Hungarico servata". Annales Historico-Naturales Musei Nationalis Hungarici. 40: 97–257.

• Caporiacco, L. di (1940). "Aracnidi raccolte nella Reg. dei Laghi Etiopici della Fossa Galla". Atti della Reale Accademia d'Italia. 11: 767–873.

• Citizen science observations for Firmicus at iNaturalist