Myrmecina glabra

An inhabitant of litter.

Identification
Okido, Ogata, and Hosoishi (2020) - Myrmecina glabra does not belong to any species complex. This species is easily distinguished from the other species by the completely smooth, shining mesosoma in dorsal view.

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

Nomenclature

 * . Myrmecina glabra Okido, Ogata & Hosoishsi, 2020: 40, fig. 16 (w.) MALAYSIA.

Worker
Holotype. TL 2.06, HL 0.50, HW 0.46, CI 94, SL 0.38, SI 83, PW 0.34, ML 0.53. Paratype. TL 2.04, HL 0.50, HW 0.48, CI 95, SL 0.38, SI 80, PW 0.34, ML 0.51 (1 measured).

Head subrectangular, longer than broad in full-face view; median portion of occipital margin concave; occipital corners rounded, not projected posteriorly. Masticatory margin of mandible bent at midlength (third small tooth or sixth tooth); apical tooth strong, third tooth robust, followed by 4 small teeth and a blunt basal tooth. Dorsal surface of clypeus not concave; median portion of anterior margin slightly projected and concave; lateral portion simple, lacking sharp ridge in front of antennal insertions. Anterior dorsal surface of labrum with paired denticles small and blunt, close to each other. Frontal carinae present but very short and unclearly, running back to the level of the posterior margin of the eyes. Eyes very small and moderately convex, varying in size with maximum diameter 0.06-0.08 mm and 11-13 ommatidia; malar space two times as long as diameter of eye in profile; distance between occipital margin and posterior margin of eye four times as long as diameter of eye. Antennal scape short, not reaching posterolateral corner of head; antennal flange weakly developed.

Dorsal outline of mesosoma convex in profile. Pronotum without denticles on dorsolateral portion; anterior portion not marginate; anterior ventrolateral portion slightly projected. Furrow between pronotum and mesoepisternal projection broad. Eumetanotal spine present but small. Propodeal spine triangular, as long as broad at base, feebly extending over vertical posteriormost limit of propodeum in profile. Propodeal lobe low. Propodeal spiracle large, situated near posterior margin of propodeum, apart from margin by its diameter. Petiole short, slightly longer than high in profile, and longer than broad in dorsal view; dorsal crest located at midlength in profile; subpetiolar process much reduced; ventral outline slightly concave. Postpetiole broader than petiole in dorsal view; lateral margin almost straight; dorsal outline flattened in profile; ventral outline projected with acute anterior apex.

Anterior margin of gaster not concave in dorsal view; first gastral sternum simple without median longitudinal ridge.

Head completely smooth and shining on dorsum and ventrolateral portion. Clypeus smooth and shining. Mesosoma completely smooth and shining. Forecoxa smooth and shining. Petiole and postpetiole with weak irregular rugae. First gastral segment smooth and shining. Head with dense and short pilosity on dorsum. Mesosoma with dense and short pilosity on dorsum, hairs of pronotum as long as or slightly shorter than propodeal spine. Petiole and postpetiole without hairs on ventral surface. Body black to reddish brown, mandibles, antennae and legs yellowish brown.

Type Material
Holotype worker, MALAYSIA: Neg. Sembilan, Pasoh For. Res., xi. 1994 (M. Brendell, K. Jackson & S. Lewis). Paratype. 1 worker with same data as holotype.