Adelomyrmex striatus

Longino (2012) - I received from P. S. Ward a series of three workers and one queen from a single Winkler sample from Peru (Loreto, 15km WSW Yurimaguas, 5°59'S, 76°13'W, 200m, PSW8701) that showed strong variation among the workers. One worker was identical to images of the Manaus paratype, with sharp spiniform teeth on the median clypeal lobe and regular costate sculpture on the petiolar and postpetiolar nodes. In contrast, the other two workers and the queen had less pronounced teeth on the median clypeal lobe, and the petiolar and postpetiolar nodes were smooth and shiny. Also, on these latter specimens, the facial costae were somewhat thinner and less regular. I also received a worker from Ecuador (Napo, Jatun Sacha, 1°04'S, 77°37'W, 400m, PSW11364) that was similar to the Manaus paratype.

Identification
This species is readily separated from congeners by the conspicuous longitudinal striation, very short propodeal spines, and subquadrate petiole and postpetiole.

Distribution based on Regional Taxon Lists
Neotropical Region: Brazil, Colombia, Ecuador, Peru.

Nomenclature

 *  striatus. Adelomyrmex striatus Fernández, 2003b: 29, figs. 37, 74 (w.) BRAZIL.

Worker
(Paratype). HL 0.58 HW 0.51 SL 0.38 EL 0.08 WL 0.53 GL 0.66 TL 2.13 CI 88 SI 75.

Mandibles with slightly oblique masticatory borders, with 5 teeth decreasing in size from the apical teeth, the last two poorly defined. Clypeus short. Dorsum of clypeal plate with two curved ridges prolongued into frontal carinae. Clypeal tooth of the anterior clypeal margin not ready visible in full face view. Eyes small, with approximately 14 facets. [Hypostomal tooth not observed]. Promesonotum strongly convex; metanotal groove feebly impressed. Propodeum sloping with two very short spines, reduced to small triangles. Propodeal lobe subtriangular, evenly rounded. Petiole and postpetiole stout, massive. Node of petiole subquadrate, with anterior and posterior faces slightly sloping to apex which is slightly convex. Venter of postpetiole with two transverse ridges, the anterior one more developed, in profile looking as teethlike projections; dorsal surface as in petiolar node. Head, pronotum and mesonotum longitudinally striate. Sides of mesosoma and petiole longitudinally striate. Dorsal face of propodeum, petiole and postpetiole transversely striate. Postpetiole obliquely striate. Anterior side of petiole and posterior side of postpetiole transversely striate. Mandibles smooth to with longitudinal rugae feebly marked in the outer half. Mandibles, legs and gaster smooth and shining. Hairs yellowish, long and flexuous on the body, some very long, more short and apressed on antennae and legs. Few long hairs on hind femora. Head and thorax brown, gaster light brown, antennae and legs yellowish.

Type Material
1 w, paratype, BRASIL: Amazonas, Igarapé, Marianil, R. Branco, Rov. Km 25 NE Manaus, 22.viii.62, W.L. Brown Jr. leg. M-13. Holotype worker, same locality, seen but not measured. Both deposited in MZSP. In the MZSP there are also a teneral worker of this species.

References based on Global Ant Biodiversity Informatics

 * Longino J. T. 2012. A review of the ant genus Adelomyrmex Emery 1897 (Hymenoptera, Formicidae) in Central America. Zootaxa 3456: 1-35