Pogonomyrmex snellingi

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Pogonomyrmex snellingi
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Pogonomyrmecini
Genus: Pogonomyrmex
Species group: californicus
Species: P. snellingi
Binomial name
Pogonomyrmex snellingi
Taber, 1998

Pogonomyrmex snellingi casent0006269 p 1 high.jpg

Pogonomyrmex snellingi casent0006269 d 1 high.jpg

Specimen Labels

Known from the type collection, taken from low elevation sand dunes in Baja California, Mexico, and a second collection from Baja California Sur. This second collection was found in the Vizcaino Desert and was made from a tumulus nest with 2-3 entrances.

Identification

Taber (1998) - The oblique dentary margin of the mandible (similar to that of Hylomyrma) is sufficient for the identification of this species, as all congeners have a roughly transverse margin. Furthermore, no other Pogonomyrmex species has the following combination of characters: distinct gap between the ultimate and penultimate mandibular teeth, offset ultimate tooth, short basal mandibular margin, and circumocular whorls. The oblique dentary margin and the presence of circumocular whorls readily distinguish this ant from both Pogonomyrmex apache and Pogonomyrmex occidentalis.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Neotropical Region: Mexico (type locality).

Check distribution from AntMaps.

Distribution based on specimens

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The above specimen data are provided by AntWeb. Please see Pogonomyrmex snellingi for further details

Biology

Castes

Nomenclature

The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.

  • snellingi. Pogonomyrmex snellingi Taber, 1998: 169, fig. A4 (w.) MEXICO.

Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.

Description

CI 114.3, EL 0.46 mm, EW 0.28 mm, HL 1.47 mm, HW 1.68 mm, 0I 31, PNL 0-49 mm, PNW 0.35 mm, PPL 0-49 mm, PPW 0.60 mm, SI 75, SL 1.26 mm, WL 1.82 mm.

Mandible with seven teeth; apical tooth longest; subapical about equal in length to first basal; second basal (middle tooth) half or less than half the length of first basal; third basal a little longer than subapical and first basal; penultimate tooth length less than or equal to second basal; ultimate tooth strongly offset, about equal in length to subapical, separated from penultimate tooth by a large gap; basal margin of mandible short and almost straight. Dentary margin of mandible not transverse as in all congeners, but oblique, as in Hylomyrma. Base of antenna moderately developed, but rather large for a member of the P. californicus species complex; basal flange thin; lip weak and curved distad; point weak. Longitudinal cephalic rugae diverging from frontal lobes to occiput, coarseness and spacing of cephalic rugae moderate in comparison with the extremes displayed within the genus; interrugal areolation distinct but not presenting a beaded appearance; circum ocular whorls present (common feature in P. californicus complex); in lateral view, eye situated approximately in the center of the side of the head; frontal area shallow; lateral lobe of clypeus without projection below antenna fossa. MesopropodeaI depression weak, propodeum with small tubercles, but no spines; rugae of thoracic dorsum coarse, interrugal spaces shining; apex of petiolar node rounded, nipple absent; ventral process of anterior peduncle of petiole weak, the process lacking setae (setae present in P. barbatus species complex); ventral process of postpetiole node weak; dorsal rugae of petiolar node sparse and confined to posterior half, surface of node shagreened; a very few rugae on dorsum of postpetiolar node, these confined to extreme posterior of node, the surface of the node shagreened. Dorsum of gaster very lightly shagreened. Setae of head, ali trunk and gaster coarse and clear; psammophore well developed. Body color dark reddish brown.

Paratypes: CI 100.0- 119.0, EL 0.35-0.42 mm, EW 0.25- 0.28 mm, HL 1.47- 1.65 mm, HW 1.65-1.75 mm, 01 23.4- 26.7, PNL 0-46- 0.53 mm, PNW 0.35-0.39 mm, PPL 0.42....:.0.49 mm, PPW 0.56-0.63 mm, SI 62.7- 65.2, SL 1.05- 1.I2 mm, WL 1.75-1.89 mm.

The propodeal armature varies from very short spines to a complete absence of either spines or tubercles. The paratypes are otherwise similar to the holotype.

Type Material

HOLOTYPE (worker): Mexico, Baja California, 8 km N Guerrero Negro, altitude 0- 8 m; sand dunes, 24 August 1977, R. Snelling (collector) Los Angeles County Museum of Natural History. PARATYPES (worker): Five specimens, with same collection data as holotype. LACM, Museum of Comparative Zoology, National Museum of Natural History, Taber personal collection

Etymology

The new species is dedicated to Roy R. Snelling, accomplished hymenopterist and collector of the ant named in his honor.

References

  • Taber, S. W. 1998. The world of harvester ants. College Station, Texas: Texas A&M University Press, xvii + 213 pp.: 213pp (page 169, fig. A4 worker described)