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Species: Proceratium californicum   Cook, 1953 

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Taxonomic History (provided by Barry Bolton, 2019)

Proceratium californicum Cook, 1953: 45, fig. (m.) U.S.A. Nearctic. AntCat AntWiki HOL

Taxonomic history

Snelling, 1967 PDF: 4 (q.); Ward, 1988 PDF: 109 (w.).


  Geographic regions (According to curated Geolocale/Taxon lists):
    Americas: United States
  Biogeographic regions (According to curated Bioregion/Taxon lists):

Distribution Notes:

Central and southern California. Endemic.


This rarely collected ant is known from valley oak (Quercus lobata) riparian woodland in the Central Valley and from adjacent foothill localities (oak woodland; chaparral; grassland). It is presumed to be a specialist, subterranean predator on spider eggs. Alates have been collected in April and May.


Worker: standing pilosity lacking on scape and legs; scape relatively long (SL/HL 0.76-0.80); eye vestigial, reduced to a fleck of dark pigment (no distinct ommatidium); petiole low and broad, with anterior and posterior faces converging on a rounded summit; length of abdominal sternite 4 (excluding the presternite) about 0.4 times that of the corresponding tergite.


Snelling (1967); Ward (1988).

Taxonomic Treatment (provided by Plazi)

Treatment Citation: Ward, P. S., 2005, A synoptic review of the ants of California (Hymenoptera: Formicidae)., Zootaxa 936, pp. 1-68

Proceratium californicum CookHNS 1953

E1 [endemic to California], E2 [endemic to California floristic province (Hickman, 1993)]

Specimen Habitat Summary

Found most commonly in these habitats: 3 times found in riparian woodland, 2 times found in oak woodland, 1 times found in serpentine grassland, 1 times found in in soil, 1 times found in oak savanna, 1 times found in open grassland.

Found most commonly in these microhabitats: 2 times sifted litter, 1 times worker under stone, 1 times under stone, 1 times under log, 1 times under large rock, 1 times sifted litter (leaf mold, rottenn wood).

Collected most commonly using these methods: 1 times hand collecting, 1 times midden, 1 times search.

Elevations: collected from 15 - 1050 meters, 411 meters average

Type specimens:

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