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Taxonomic History (provided by Barry Bolton, 2018)

Distribution:

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

Identification:

Buren (1968) notes the subpetiolar process of this species as "strikingly large," a character in combination with a postpetiole which is wider anteriorly and has straight sides, which sets C. mutans from the rest of the western Crematogaster.

Taxonomic Treatment (provided by Plazi)

Specimen Habitat Summary

Found most commonly in these habitats: 2 times found in pinyon pine/sagebrush, 2 times found in sagebrush scrub, 2 times found in Sarcobatus scrub, 2 times found in oak woodland, 2 times found in sagebrush, 1 times found in sagebrush-riparian vegetation, 1 times found in juniper woodland, 1 times found in desert sand dunes, 1 times found in grassland.

Found most commonly in these microhabitats: 3 times under stone, 1 times tending homoptera at base of plant, 30-10 times at uv-light, 9, 1 times at uv-light, 9-11 pm, 1 times at blacklight, 1 times tending homoptera at base of Ephedra, 1 times outside Formica ravida nest, 1 times ground forager(s), 1 times ex Veromessor andrei nest midden, 00-11 times at uv-light, 9, 00-10 times at uv-light, 9, ...

Collected most commonly using these methods: 4 times search, 3 times collected at uv-light, 1 times blacklight, 1 times at uv-light, 9-11 pm, 1 times hand collecting, 00-10 times at uv light, 9.

Elevations: collected from 400 - 2256 meters, 1487 meters average

Type specimens: Paratype Crematogaster mutans: casent0616047, casent0616048, casent0616049, casent0616050, casent0616051, casent0616052, casent0616053, casent0616054, casent0616055

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