Temnothorax politus

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Temnothorax politus
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Crematogastrini
Genus: Temnothorax
Species: T. politus
Binomial name
Temnothorax politus
(Smith, M.R., 1939)

Temnothorax polita casent0104690 profile 1.jpg

Temnothorax polita casent0104690 dorsal 1.jpg

Smith (1939) reported: the workers of this ant seem to be most commonly found on the ground in the vicinity of irrigation canals, washes, and rivers. Specimens have been taken at altitudes up to 4,500 feet. They are rather shy and sensitive to heat. Little else is known of their biology except that one nest was found in the bark of a cottonwood tree, about 2 inches above the surface of the soil.

Identification

The worker of this species is characterized by its strongly convex, evenly arched thorax; absence of dorsal thoracic sutures; peculiarly shaped petiole, the peduncle of which is approximately the length of the petiolar .node; the smooth and shining surface of the body; and the general black color.

Distribution

United States: Central and southern Arizona.

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

Abundance

Only collected twice.

Castes

Known only from the worker caste.

Nomenclature

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

  • politus. Macromischa polita Smith, M.R. 1939e: 506, pl. 1, fig. B (w.) U.S.A. Combination in Leptothorax: Baroni Urbani, 1978b: 478; in Temnothorax: Bolton, 2003: 272.

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

Description

Worker

Worker (PI. I, B). Length 2-2.4 mm.

Head, exclusive of mandibles, subrectangular, slightly longer than broad; posterior border faintly convex; occipital angles strongly rounded, and sides moderately convex. Eye convex, removed by at least the length of its greatest diameter from base of mandible. Antenna 12-segmented; scape slender, extending farther posteriorly on head than scape of floridana; first funicular segment approximately length of the three succeeding segments combined, club 3-segmented, as long as remainder of funiculus. Clypeus convex, more strongly projecting than that of subditiva, posterior border rounded and extending well back between frontal carinqe. Frontal area small, triangular, poorly defined. Mandible 5-toothed, the two apical teeth clearly visible. Thorax short, robust, in profile with strongly convex and rather evenly arched dorsum; from above somewhat broader anteriorly than posteriorly, with rounded humeral angles and no promesonotal or mesoepinotal sutures; epinotal spines large, at least twice length of their interbasal space. Femora and tibiae incrassate, especially those of the posterior pair of legs. In profile, petiolar peduncle short, approximately length of bulbous node, which has subvertical anterior and posterior surfaces, and an evenly convex dorsal surface; peduncle with a small ventral footh; from above, petiolar node somewhat campanulate; postpetiole transversely elliptical, approximately one and one-half times as broad as petiolar node. Base of gaster with strong angles.

Head, thorax, petiole, postpetiole, gaster, femora, and tibiae smooth and shining; mandibles longitudinally striate, clypeus with a prominent median carina and several lateral rugulae, cheeks and anterior portion of each frontal carina with longitudinal rugulae, meso- and metapleura of thorax longitudinally rugulose punctate.

Hairs grayish, slender, erect, moderately abundant on all parts of body; shorter and more suberect on appendages.

Black; with lighter mandibles, epinotal spines, coxae, trochanters, bases of femora, tibiae, and tarsi .

Type Material

Tucson area, Phoenix, Florence, Arizona. Cotypes.-No.'53249, National Museum of Natural History. Described from 26 specimens, collected by Robert G. Wesson. All these are in the United States National Museum collection except the following: 2 workers from Phoenix, Robert G. Wesson; 2 workers from along Santa Cruz River, AMNH; 2 workers from along Santa Cruz River, Museum of Comparative Zoology.

References