Lenomyrmex costatus

Only know from the type. The label states it was collected along a road (Fortuna to Chiriqui) but there is no habitat specified.

Distribution based on Regional Taxon Lists
Neotropical Region: Panama.

Nomenclature

 *  costatus. Lenomyrmex costatus Fernández & Palacio, 1999: 11, fig. 7 (w.) PANAMA.

Worker
TL: 3.88; HL: 0.76; HW: 0.64; ML: 0.30; SL: 0.55; EL: 0.20; WL: 1.12; PL: 0.44; PW: 0.21; PPL: 0.25; PPW: 0.22; GL: 1.00; GW: 0.66; CI: 0.84; OI: 0.31. Worker diagnosis. Similar to Lenomyrmex mandibularis, with the following differences. Propodeal spines longer, length at least 1-3 greater than distance between bases. Petiolar node poorly defined, dorsal surface of peduncle forms a continuous and slightly convex surface with the node; posterior face of petiolar node shorter, steeper. Subpetiolar process widely rounded in anteroventral view. Head, mesosoma, petiole and postpetiole with well impressed costae; costae of head and propodeal dorsum longitudinal; those of pronotum and mesonotum transverse, continued in an obtuse angle on the mesonotum with oblique mesopleural costae; petiole and postpetiolar costae longitudinal. Head with numerous suberect hairs, longer than in Lenomyrmex mandibularis. Scape with several erect to suberect hairs, as long as or longer than maximum scape diameter. Femora and tibiae with some erect and suberect scattered hairs; decumbent pile less abundant than in Lenomyrmex mandibularis. Body ferruginous yellow; antennae and legs slightly lighter; mandible and antennal club whitish yellow

Type Material
Rabeling et al. (2016) - Holotype. Panama; Bocas del Toro; Fortuna to Chiriqui Grande rd.; elevation 1050 meters above sea level; GPS coordinates: 8°47'N, 82°12'W; 14.vii.1987; leg. D. M. Olson (DMO523); MCZ-ENT00036069. .

Etymology
From the Latin costa (rib), in reference to the rib-like sculpture that covers the head, mesosoma and waist segments.

References based on Global Ant Biodiversity Informatics

 * Fernández F. and Palacio, E. E. 1999. Lenomyrmex, an enigmatic new ant genus from the Neotropical region (Hymenoptera: Formicidae: Myrmicinae). Systematic Entomology 24: 7-16
 * Fernández, F. and S. Sendoya. 2004. Lista de las hormigas neotropicales. Biota Colombiana Volume 5, Number 1.