Lordomyrma emarginata

Sympatric on Mt Isarog with Lordomyrma diwata and Lordomyrma idianale. This species is known from a small number of type workers. The holotype was collected from leaf litter.

Distribution based on Regional Taxon Lists
Indo-Australian Region: Philippines.

Castes
Known only from the worker caste.

Nomenclature

 *  emarginata. Lordomyrma emarginata Taylor, 2012: 55, figs. 25-28 (w.) PHILIPPINES (Luzon).

Worker
A relatively distinctive species, as seen in images. Clypeus, antennae and head shape generally as in Lordomyrma azumai. Antennal funiculus clavate but without delineation of a distinct segmentally defined club. Head relatively broad behind eyes (HW there almost as great as HW across eyes); vertexal margin in facial view shallowly but clearly concave. When viewed from behind (perpendicular to the vertex) the top and sides of the head merge bilaterally to form a tightly rounded angle of ca. 90°. Mesosoma compact, relatively short (WL:HL ratio = 1.27 versus 1.35 in L. azumai); Promesonotum inflated and strongly elevated (APE approximating 45-50° versus ca. 25° in L. azumai; humeri squared in dorsal view, but lacking nodules equivalent to those of L. azumai. Metanotal groove relatively weakly indented in lateral view, lacking an incised suture. Propodeal dorsum sloping strongly posteriad, outline in profile feebly concave; propodeal spines small, acute, squarely erect. Petiolar summit narrowly, sharply acutely transverse, the apex weakly emarginate in frontal view; minutely, obtusely bilaterally denticulate. Pre-gastral body surfaces almost entirely coarsely and more-or-less uniformly rugose, as seen in images, the rugal surfaces smooth and strongly reflective. Head ventrally smooth. Nucal collar finely roughly punctate. Propodeal declivity transversely striate. Gaster subopaque, generally shagreened with overlying fine net-like reticulum, strongest anteriorly. Mandibles finely longitudinally striate. Antennal scapes vaguely, very finely longitudinally striate-punctate. Anterior coxae coarsely, regularly transversely striate; middle and hind coxae with a few similar striae on their upper surfaces; legs otherwise sculptured like scapes. Pilosity as seen in images. Color generally dark, blackish-brown, the gaster more reddish. Antennae and legs lighter orange-brown. Dimensions: (holotype; paratype): TL 5.3, 5.2; HW 1.24, 1.20; HL 1.25, 1.22; CI 99, 98; EL 0.21, 0.21; OI 17, 18; SL 0.87, 0.85; SI 70, 71; PW 0.89, 0.88; WL 1.58, 1.58; DPW 0.42, 0.39; DPpW 0.0.46, 0.45; GW 1.39, 1.32.

Type Material
PHILIPPINES: LUZON: Mt Isarog National Park, Panicuason Village, Camarines Sur (13°39 28.5’N, 123°20 11.2’E). Known from the holotype (J. Caceres, 24-x-2006, ex leaf litter) and a single paratype, both workers, collected separately at the type-locality (J. Caceres, 23-ix-2006). Holotype:. Paratype:.

Etymology
Named for the emarginate transverse petiolar dorsum.

References based on Global Ant Biodiversity Informatics

 * Taylor R. W. 2012. Ants of the genus Lordomyrma Emery (2) The Japanese L. azumai (Santschi) and six new species from India, Viet Nam and the Philippines (Hymenoptera: Formicidae: Myrmicinae). Zootaxa 3282:45-60.