Octostruma schusteri

Octostruma schusteri is known from cloud forest on the slopes of Volcán Atitlán, 1070–1400 m elevation, all from Winkler samples of sifted litter and rotten wood from the forest floor. (Longino 2013)

Identification
Face lacking transverse arcuate carina; basal five teeth of mandible acute; apex of labrum bilobed; mesosomal dorsum and first gastral tergite lacking erect setae; HW > 0.80. (Longino 2013)

Distribution based on Regional Taxon Lists
Neotropical Region: Guatemala.

Castes
Known only from the worker caste.

Nomenclature

 *  schusteri. Octostruma schusteri Longino, 2013: 50, figs. 1B, 3B, 5N, 37, 43 (w.) GUATEMALA.

Worker
HW 0.82–0.87, HL 0.71–0.74, WL 0.88–94, CI 116–119 (n=5). Differing from Octostruma gymnosoma in the following respects (O. gymnosoma characters in parentheses): clypeus and face sublucid, clypeus smooth with shallow, widely-spaced puncta, face shallowly irregularly rugulose, tops of rugae flattened, shining (clypeus and face matte, with fainter sculpture); side of pronotum smooth (faintly punctate); first gastral tergite uniformly punctate, puncta small, diameter subequal to interspaces, interspaces smooth and shining (first gastral tergite covered with very faint, dense, confluent puncta, appearing shagreened); face with 6–8 spatulate setae, missing setae near eyes on some specimens (face lacking erect setae).

Type Material
Holotype worker: GUATEMALA, Suchitepéquez: 5 km S Vol. Atitlán, 14.54074, -91.18815, ±35 m, 1400 m, 18 Jun 2009, cloud forest, ex sifted leaf litter (LLAMA, Wm-B-09-2-07), unique specimen identifier CASENT0611856. Paratype workers: same data except 5.5 km S Vol. Atitlán, 14.52857, -91.19569, ±200 m, 1070 m, riparian forest, ex sifted leaf litter (LLAMA, Wm-B-09-2-08), CASENT0611871; , CASENT0627368; UVGC, CASENT0627369; , CASENT0627370.

Etymology
The name is in honor of Jack Schuster, Entomologist at the Universidad del Valle, Guatemala. It is a genitive singular noun and thus invariant.

References based on Global Ant Biodiversity Informatics

 * Longino J. T. 2013. A revision of the ant genus Octostruma Forel 1912 (Hymenoptera, Formicidae). Zootaxa 3699(1): 1-61.