Neivamyrmex pauxillus

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Neivamyrmex pauxillus
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Dorylinae
Genus: Neivamyrmex
Species: N. pauxillus
Binomial name
Neivamyrmex pauxillus
(Wheeler, W.M., 1903)

Neivamyrmex pauxillus casent0104811 profile 1.jpg

Neivamyrmex pauxillus casent0104811 dorsal 1.jpg

Specimen labels

Because they are rarely encountered, little is known of their habits. Some success has been had locating these minute species using underground baiting. They will likely prove to be subterranean predators of either other ants or of termites. (Snelling and Snelling 2007)

Identification

This is one of several small, nondescript yellow Neivamyrmex species.

Keys including this Species

Distribution

United States: Louisiana and Texas; Mexico: Hidalgo (Watkins, 1982).

Distribution based on Regional Taxon Lists

Nearctic Region: United States (type locality).
Neotropical Region: Mexico.

Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Wheeler (1904) - Described from nine specimens; the only occasion on which I have seen this species. The insects were moving along under a stone in a small troop, all the members of which were very nearly of the same diminutive size.

Castes

Worker

Nomenclature

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

  • pauxillus. Eciton (Acamatus) pauxillum Wheeler, W.M. 1903b: 93, fig. 1 (w.) U.S.A. Watkins, 1971: 99 (q.). Combination in E. (Neivamyrmex): Smith, M.R. 1942c: 569; in Neivamyrmex: Borgmeier, 1953: 19. See also: Borgmeier, 1955: 570.

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

Description

Worker

Length 1.75-2 mm.

Mandibles with a very prominent basal tooth. Head, including mandibles, fully twice as long as broad, occipital border slightly concave, posterior angles rather sharp, sides subparallel. Eyes completely absent. Antennal scape thick, not reaching half way to the posterior angle of the head, funiculus robust, first joint nearly as long as the second and third together, joints 2-6 distinctly broader than long; joints 7-9 about as wide as long. Thorax flattened dorsally, laterally compressed, with distinct mesoepinotal constriction; basal surface of epinotum flattened, longer than the declivity, with which it forms a rounded, obtuse angle. Petiole and postpetiole, whether seen from above or in profile, of similar size and form; each furnished with an anterior ventral tooth; petiole distinctly longer than the postpetiole, longer than broad, subelliptical from above; postpetiole not longer than broad, somewhat wider behind than in front. Gaster elongate elliptical, distinctly flattened dorso-ventrally. Legs short and robust. Claws simple.

Smooth and shining, especially the head and thoracic dorsum; sides of neck, meso- and metapleurae, together with the ventral surfaces of the petiole and postpetiole, distinctly and evenly reticulate. Mandibles, head and thorax with coarse but scattered piligerous punctures.

Body and appendages covered with sparse and rather long, suberect, yellow hairs. Reddish yellow throughout except the mandibles, clypeus, and anterior border of the head which are more brownish.

Type Material

Described from nine specimens taken at Austin, Tex., May 25, 1901.

References

  • Borgmeier, T. 1953. Vorarbeiten zu einer Revision der neotropischen Wanderameisen. Stud. Entomol. 2: 1-51 (page 19, Combination in Neivamyrmex)
  • Borgmeier, T. 1955. Die Wanderameisen der neotropischen Region. Stud. Entomol. 3: 1-720 (page 570, see also)
  • Smith, M. R. 1942c. The legionary ants of the United States belonging to Eciton subgenus Neivamyrmex Borgmeier. Am. Midl. Nat. 27: 537-590 (page 569, Combination in E. (Neivamyrmex))
  • Snelling, G. C.; Snelling, R. R. 2007. New synonymy, new species, new keys to Neivamyrmex army ants of the United States. In Snelling, R. R., B. L. Fisher, and P. S. Ward (eds). Advances in ant systematics (Hymenoptera: Formicidae): homage to E. O. Wilson - 50 years of contributions. Memoirs of the American Entomological Institute 80:459-550. PDF
  • Watkins, J. F., II. 1971. A taxonomic review of Neivamyrmex moseri, N. pauxillus, and N. leonardi, including new distribution records and original descriptions of queens of the first two species. J. Kans. Entomol. Soc. 44: 93-103 (page 99, queen described)
  • Wheeler, W. M. 1903c. A decad of Texan Formicidae. Psyche (Camb.) 10: 93-111 (page 93, fig. 1 worker described)