Myrmecina sabahna

Nothing is known about the biology of .

Identification
Okido, Ogata, and Hosoishi (2020) - Similar to Myrmecina insulana and Myrmecina yamanei (see the  M. insulana identification section for details) but distinguished by a smooth and shining ventrolateral portion of the head, anterior clypeal margin with median paired processes, and short antennal scapes just reaching the occipital corner.

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

Nomenclature

 * . Myrmecina sabahna Okido, Ogata & Hosoishsi, 2020: 88, fig. 41 (w.) MALAYSIA.

Worker
Holotype worker. TL 2.86, HL 0.69, HW 0.62, CI 91, SL 0.59, SI 95, PW 0.46, ML 0.74. Paratype workers. TL 2.88-2.98, HL 0.70-0.74, HW 0.64-0.69, CI 91-93, SL 0.59-0.65, SI 93-94, PW 0.48-0.51, ML 0.69-0.75 (2 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 with four processes, sometimes unclearly; lateral portion simple, lacking sharp ridge in front of antennal insertions. Anterior dorsal surface of labrum with paired small denticles distinctly, which are very close to each other. Frontal carinae present but unclearly, running to about apical two thirds of the line through eyes. Eyes medium-sized and moderately convex, varying in size with maximum diameter 0.08-0.09 mm and 5-6 ommatidia; malar space twice 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 or longer. Antennal scape short, just reaching posterolateral corner of head; antennal flange fully developed.

Dorsal outline of mesosoma slightly convex in profile. Pronotum usually without denticles on dorsolateral portion, but sometimes bearing small denticles; anterior portion marginate but unclearly in dorsal view; anterior dorsolateral portion angulate; anterior ventrolateral portion variable, not angulate or projected bluntly. Furrow between pronotum and mesoepisternal projection broad. Eumetanotal spine present but small. Propodeal spine triangular, longer than broad at base, extending over vertical posteriormost limit of propodeum in profile. Propodeal lobe low. Propodeal spiracle large, situated near posterior margin of propodeum, distance between posterior margin of spiracle and posterior margin of propodeum longer than diameter of spiracle. Petiole short, as long as or slightly longer than high in profile, slightly longer than broad in dorsal view; dorsal crest located at midlength in profile; subpetiolar process absent. Postpetiole slightly broader than petiole in dorsal view; lateral margin straight; dorsal outline flattened in profile; ventral outline slightly projected rectangularly with acute anterior apex.

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

Head with wavy rugae which are thin weakly; ventrolateral portion smooth and shining. Clypeus smooth and shining. Mesosoma usually with wavy rugae distinctly. Forecoxa smooth and shining. Petiole and postpetiole with longitudinal 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 shorter than propodeal spine. Petiole without hairs on ventral surface. Postpetiole with about 6 hairs on ventral surface. Body black, mandibles, forecoxae reddish brown, antennae and legs yellowish brown.

Type Material
Holotype worker, MALAYSIA: Mahua Waterfall area, ca. 1000 m alt., Crocker Range N. P., Sabah, 5. xi. 2000, MA00-HO-025 (H. Okido). Paratypes. 5 workers with same data as holotype.