Temnothorax texanus

Mackay (2000) "This species nests in sandy soil (Wheeler, 1903a; Talbot, 1934; Wesson and Wesson, 1940; Gregg, 1944; Smith, 1952) or even sand dunes (Talbot, 1934; Cole, 1952), or clay soils (Cole, 1952) in damp spots under post-oaks, cedars and pines (Talbot, 1934; Carter, 1962; Mackay et al., 1988), often in the driest sites (Carter, 1962). They often nest at the base of a grass clump (Smith, 1952). Males have been collected from late May to late July in the nests (Wesson and Wesson, 1940; Cole, 1952; Smith, 1952). These ants form foraging trails which are nearly invisible, across sand dunes and moss (Smith, 1952), and apparently use tandem running."



Identification
Mackay (2000) "This is a small (total length 2.25mm), dark brown species with a 12-segmented antenna, in which the postpetiole is more than 1.5 X the width of the petiole. The entire ant is roughly sculptured, with rugae on the head, top and side of the mesosoma, on the petiole and on the postpetiole. The gaster is smooth and glossy. The subpeduncular process is poorly defined and consists of a tiny tooth. The node of the petiole is truncate, the propodeum has well-developed spines.

The massive postpetiolar node, which is coarsely reticulo-rugose or punctate, separates this taxon from all others in the genus. Temnothorax davisi differs in that the postpetiole is somewhat wider and is covered with poorly defined punctures. The head of T. texanus is mostly covered with punctures, but the central region is partially smooth, without striae, which are found in T. davisi. The node of the petiole is not truncate as it is in T. davis. Temnothorax texanus is found in the mid west and western part of the United States, T. davisi from eastern US."

Abundance
xxxxx Only known from a few collections. xxxxx

Biology
xxxxx

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Texas
Wheeler (1903) All three sexual phases of this species were taken May 23, 1902, in nests consisting of a few small galleries, 3-4 inches long, excavated in the sand in rather damp spots under post-oaks and cedars.

Original Combination
Leptothorax texanus Wheeler, W.M. 1903c: 245, pl. 12, fig. 16 (w.q.m.) U.S.A. Wheeler, G.C. & Wheeler, J. 1960b: 24 (l.). Combination in L. (Myrafant): Smith, M.R. 1950a: 30; in Temnothorax: Bolton, 2003: 272. Senior synonym of davisi: Deyrup & Cover, 2004a: 56. See also: Smith, M.R. 1952b: 102; MacKay, 2000: 415.

Worker
Length 2.25-2.75 mm. Head longer than broad. Eyes rather large. Mandibles 5-toothed. Clypeus moderately convex, its anterior border somewhat rounded. Antennae 12-jointed; scape reaching nearly to the posterior angle of the head; funiculus terminating in a very distinct 3-jointed club, the last joint of which is somewhat longer than the two preceding joints; first funicular joint nearly as long as joints 2-5; second funicular joint about as long as broad, the remaining joints broader than long. Thorax rather short, its humeral angles rounded, dorsum evenly and slightly rounded, without mesoepinotal constriction. Epinotal spines moderate, distinctly shorter than the declivous surface of the epinotum, scarcely as long as their distance apart at the base, rapidly tapering, acute, directed upward, outward and backward. their tips slightly deflected. Petiole from above fully 1 1/2 times as long as broad; its sides somewhat convex, so that its outline is subelliptical; in profile the anterior slope is abrupt and distinctly concave, the summit of the node flattened, and the posterior slope suddenly declivous; ventral tooth small, acute, directed downward. Postpetiole very large, fully twice as broad as the petiole; broader than long, its anterior and posterior angles rounded, so that it appears transversely elliptical from above; in profile it is very convex, especially in front. Gaster elliptical, depressed, without distinct anterior angles.

Mandibles coarsely striated. Clypeus traversed by several clean-cut longitudinal rugae, subsiding on the posterior portion which is smooth and shining. Head subopaque, coarsely reticulate-rugose; the rugae distinctly longitudinal only on the front and vertex; interrugal spaces secondarily reticulate. Neck evenly reticulate; thoracic dorsum very coarsely and irregularly reticulate-rugose; the, spaces between the rugae smooth and shining, because the secondary reticulation is indistinct or lacking. Pleurae somewhat more delicately and evenly rugose. Petiole and postpetiole coarsely reticulate-rugose, interrugal spaces filled with shallow foveolae or secondary reticulation. Gaster smooth and shining.

Hairs white, rather numerous and prominent; on the trunk clavate; shorter and more erect on the head and thorax"longer and slightly reclinate on the pedicel and gaster; on the legs and antennae distinct, non-clavate, more or less appressed.

Black or very dark-brown, especially on the head, thorax and petiole. Mandibles, excepting the teeth, funiculus, tips of epinotal spines, tarsi and articulations of legs, excepting the last tarsal joint, yellow; antennal scape brown.

Queen
Length 3.75-4 mm. Head more decidedly and extensively longitudinally rugose than in the worker. Neck delicately, pronotum more coarsely reticulate-rugose; mesonotum and paraptera traversed by numerous longitudinal rugae which are more or less interrupted and have a tendency to anastomose. Scutellum with such nigre only in front and on the sides, posteriorly it is nearly smooth and shining. Pleural and epinotum with rather coarse, distinctly longitudinal rugal. Epinotal spines small, acute, straight. Petiole with pointed node and more abruptly declivous posterior slope than in the worker, its dorsal surface scarcely flattened. Postpetiole very convex in front above. Sculpturing of petiole and postpetiole as in the worker. Color of head, thorax and pedicel reddish-brown, darker on the dorsal surface. Gaster black. Pilosity of body and legs and color of the latter much as in the worker. Wings whitish-hyaline; veins and stigma yellow.

Male
Length 2-2.5 mm. Head exclusive of the mandibles broader than long, cheeks short, posterior angles convex and rounded. Mandibles overlapping each other. Antennae 13-jointed; scape as long as the first four joints of the funiculus, club very distinct, 4-jointed, the first, second and third subequal, fully 1 1/2 times as long as broad, apical joint as long as the second and third together; first funicular joint somewhat swollen, fully 1 1/2 times as long as broad; joints 2-8 longer than broad. Epinotum with two very small, indistinct protuberances in the place of the spines. Petiole slender, in profile concave below; anterior dorsal slope nearly straight, gradual, posterior slope shorter, abruptly declivous, rather concave. Postpetiole campanulate, about as long as broad; 1 1/2 times as broad as the petiole. Legs long and slender.

Mandibles striated. Clypeus coarsely and irregularly reticulate-rugose, shining. Head subopaque, evenly and rather delicately reticulate-rugose. Neck finely reticulate; mesonotum shining, with a faint reproduction of the irregular rugosity of the worker; remainder of thorax and the pedicel delicately reticulate-punctate. Gaster smooth and shining.

Hairs white, non-clavate, long and moderately abundant on the mandibles, pedicel and gaster; sparser elsewhere.

Black; mandibles and genitalia yellow; antennal funiculus grayish brown; wings like those of female; legs like those of the worker in color.

Type Material
As reported in Mackay (2000) "AMNH, MCZC [seen]."

Type Locality
USA. Milano, Millan County, TX