Strumigenys eversa

Known from a few litter collections: the type from oak/alder/pine forest, a worker from wet oak, and a worker from cloud forest.

Identification
Bolton (2000) - A member of the Strumigenys emeryi-group. Currently this is the only known species of the group that has the entire side of the alitrunk reticulate-punctate and the postpetiole disc densely costulate. It is close to Strumigenys emeryi but lacks flagellate gastral hairs, does not have a broad lamella on the propodeal declivity, and has a much shallower ventral sponigiform strip on the petiole.

Distribution based on Regional Taxon Lists
Neotropical Region: Mexico.

Nomenclature

 *  eversa. Strumigenys eversa Bolton, 2000: 514 (w.) MEXICO.

Worker
Holotype. TL 2.7, HL 0.65, HW 0.54, CI 83, ML 0.41, MI 63, SL 0.46, SI 85, PW 0.31, AL 0.66. Mandible with a small preapical tooth close to the apicodorsal tooth; proximally also with a minute denticle. Apicoscrobal hair short and truncated on right side, absent from left (damage to right side hair is suspected, in undamaged specimens this hair is probably flagellate). Both pairs of standing hairs on cephalic dorsum simple. Pronotal humeral hair long and flagellate, and an erect flagellate pair on mesonotum. All hairs on waist segments and first gastral tergite short and shallowly curved, simple or slightly flattened at their apices. Pronotal dorsum reticulate-punctate and with fine longitudinal rugulae. Pleurae and side of propodeum entirely reticulate-punctate, without smooth areas. Propodeal spines subtended by fine carinae rather than by lamellae, with a small rounded lobe at base of declivity and without propodeal lacuna. Petiole node in dorsal view broader than long, reticulate-punctate. In profile ventral surface of petiole with a very narrow spongiform strip that commences at about midlength of peduncle and extends posteriorly, gradually deepening to its maximum depth beneath the posteroventral angle, but even here it is still shallow. Disc of postpetiole finely and densely longitudinally costulate over its entire surface. Basigastral costulae slightly longer than postpetiole disc.

Type Material
Holotype worker, Mexico: Oaxaca, 5.1 km. S Suchixtepec, 2150 m., 25.vii.1992, oak/alder/pine forest litter berlese, # 92-026 (R. S. Anderson).

References based on Global Ant Biodiversity Informatics

 * Bolton, B. 2000. The Ant Tribe Dacetini. Memoirs of the American Entomological Institute 65
 * Vásquez-Bolaños M. 2011. Lista de especies de hormigas (Hymenoptera: Formicidae) para México. Dugesiana 18: 95-133