Adelomyrmex costatus Fernandez, 2003

Fernández, F., 2003, Revision of the myrmicine ants of the Adelomyrmex genus-group (Hymenoptera: Formicidae)., Zootaxa 361, pp. 1-52 : 17

Adelomyrmex costatus Fernandez NEW SPECIES (Figs. 35, 75)

Worker measurements. Holotype. HL 0.63 HW 0.58 SL 0.36 EL 0.08 WL 0.55 GL 0.65 TL 2.36 CI 92 SI 62.

Worker diagnosis. Mandibles with 5 teeth, the basal and sub-basal distanced, the basal low and blunt. Eyes with about 12 ommatidia. Mesosoma continuous, metanotal groove poorly impressed. Hypostomal tooth low, blunt. Promesonotum highly convex. Propodeal sides triangular, acute. Propodeal spiracle small, circular. Petiole node thick, rounded above, postpetiole smaller, flat above. Head, mesosoma, petiole and pospetiole coarsely costate. Costulation in head and promesonotum longitudinal, with about 15 costae on promesonotum. About 6 transverse costae on propodeal dorsum. Longitudinal costulation on mesosomal sides, transverse on petiole and postpetiole sides. Gaster smooth and shining. Dense long hairs on dorsum body. Body dark brown, appendages lighter.

Holotype worker: COLOMBIA: Cauca, PNN Isla Gorgona, Alto El Mirador, 380 m. , 31.iii. 00, R. Duque leg. (Deposited in IAvH).

Comments. A. costatus has a continuous mesosoma, the promesonotum is conspicuously and evenly convex, the petiolar node is thick, and there is coarse longitudinal costulation. This combination of characters is unique in the genus.