Dorymyrmex tuberosus

Known only from museum collections. Specimens of Santander were collected in the campus of the Industrial University of Santander and those deposited in LACM have a label saying: “ex-Manihot,” probably referred to be collected in a cultivate place. According to this data, D. tuberosus prefers, as several species of Dorymyrmex, disturbed habitats. (Cuezzo and Guerrero 2011)

Identification
Cuezzo and Guerrero (2011) - Worker Dark brown; whitish pubescence in all tagma; scape long; posterior margin of head concave in the middle; mesonotal profile interrupted by a short but distinct tubercle, besides a thin tubercle directed dorsally between dorsal and declivitous faces of propodeum.

Two well-developed tubercles on the mesosoma, along with whitish pubescence, and general dark color can be useful to differentiate D. tuberosus from the other species of Dorymyrmex found in Colombia. This species could be confused with Dorymyrmex brunneus by color but differs by the following characters: shape of the head, slightly wider after compound eyes and always with an emargination in the middle of posterior margin. Pro-mesosomal profile always at level or higher than the apex of propodeal cone. In contrary to D. brunneus, D. tuberosus has well-developed tubercles on the mesonotum.

Distribution
Known only from the Colombian type localities: Bolivar, San Juan Nepomuceno and Santander, Bucaramanga.

Distribution based on Regional Taxon Lists
Neotropical Region: Colombia.

Castes
Known only from the worker caste.

Nomenclature

 *  tuberosus. Dorymyrmex tuberosus Cuezzo & Guerrero, 2011: 21, figs. 11a-c, 14 (w) COLOMBIA.

Worker
Holotype (paratype): HL: 0.88 (0.93); HW: 0.80 (0.88); EL: 0.24 (0.25); EW: 0.20 (0.23); SL: 1.04 (0.98); COD: 0.18 (0.2); WL: 1.18 (1.20); CI: 90 (95); SI: 105 (106); REL: 27 (28); OI: 83 (90); TLI: 134 (131).

Concolorous, dark brown with the lateral corners of the clypeus reddish brown. Whitish and dense pubescence covering the all body. Head: longer than wide. Compound eye placed in the middle of the lateral part of cephalic capsule, not surpassing the lateral margins. Psammophore with short hairs disposed in a triangle; the hairs on the top line are close to the foramen magnum and not reach the oral cavity. Scape long, surpassing the posterior margin of head. Mandibles strongly striate, with five teeth and at least two denticles along the masticatory margin and numerous denticles along the basal margin. Posterior margin of head with a feeble medial emargination. Mesosoma: in profile with two tubercles, one in the posterior end of the mesonotum and one between the dorsal and the declivitous faces of the propodeum. Metasoma: petiolar scale directed dorsally, thin apically.

Type Material
Holotype. 1w, Santander: Bucaramanga, UIS, 906 m., COLOMBIA, Jun 2003, N. Ruiz and F. Fernandez coll.,. Paratypes: 7w, Bolivar, San Juan Nepomuceno, 24.Oct.1990 F. Bekker leg. Ex Manihot esculenta, COLOMBIA: 2w, ; same data and loc. than holotype, 4w, (ICN), 1w.

Etymology
The name tuberosus refers to the presence of two tubercles on the dorsal face of both mesonotum and propodeum.