Myrmecina inthanonensis

Nothing is known about the biology of .

Identification
Okido, Ogata, and Hosoishi (2020) – Similar to Myrmecina nigra by a petiole with a subpetiolar process or median longitudinal ridge, the relative length of the antennal scape, the mesosoma with the eumetanotal spine, and the relative size of the postpetiole. Myrmecina inthanonensis differs its distinctly large postpetiole relative to its petiole, the anterior clypeal margin with a single median process, and the mesosoma with straight and parallel rugae on dorsal surface.

Distribution based on Regional Taxon Lists
Oriental Region: Thailand.

Nomenclature

 * . Myrmecina inthanonensis Okido, Ogata & Hosoishsi, 2020: 55, fig. 24 (w.) THAILAND.

Worker
Holotype. TL 3.38, HL 0.80, HW 0.78, CI 97, SL 0.70, SI 91, PW 0.51, ML 0.88. Paratype. TL 3.39, HL 0.80, HW 0.74, CI 92, SL 0.70, SI 96, PW 0.50, ML 0.90 (1 measured).

Head subrectangular, longer than broad in full-face view; median portion of occipital margin distinctly 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 5 small teeth and a blunt basal tooth. Dorsal surface of clypeus concave; median portion of anterior margin projected with a median process; lateral portion simple, lacking sharp ridge in front of antennal insertions. Anterior dorsal surface of labrum with paired small denticles distinctly, close to each other. Frontal carinae virtually absent, indistinguishable from rugae on dorsum of head. Eyes slightly large and distinctly convex, varying in size with maximum diameter 0.10-0.14 mm and 7-8 ommatidia; malar space twice as long as diameter of eye or slightly longer in profile; distance between occipital margin and posterior margin of eye four times as long as diameter of eye or longer. Antennal scape long, slightly extending beyond posterolateral corner of head; antennal flange fully developed.

Dorsal outline of mesosoma convex in profile. Pronotum without denticles on dorsolateral portion; anterior portion feebly marginate; anterior ventrolateral portion angulate. Furrow between pronotum and mesoepisternal projection broad. Eumetanotal spine present but small, somtimes reduced. Propodeal spine triangular, slightly longer than broad at base, not or just reaching 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, as long as or slightly longer than high in profile, and as long as or slightly longer than broad in dorsal view; dorsal crest located anteriorly in profile; subpetiolar process absent, but median longitudinal ridge at ventral portion present. Postpetiole expanded posteriorly and slightly broader than petiole and larger than petiole in dorsal view; dorsal outline flattened in profile; ventral outline not projected.

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

Head punctured with thick rugae distinctly; ventrolateral portion punctured with thick rugae distinctly. Clypeus smooth and shining. Mesosoma punctured with thick rugae distinctly. Forecoxa with transverse rugae weakly, but sometimes smooth and shining. Petiole and postpetiole with thick rugae. First gastral segment smooth and shining. Head with relatively sparse and short pilosity on dorsum. Mesosoma with sparse and long pilosity on dorsum, hairs of pronotum as long as propodeal spine. Petiole with 4 hairs on ventral surface. Postpetiole with 4-6 hairs on ventral surface. Body and forecoxae black, mandibles, antennae and legs yellowish brown to reddish brown.

Type Material
Holotype worker, THAILAND: Doi Inthanon, 7. xi. 85 (Löbl & Burckhardt). Paratypes. 5 workers with same data as holotype (BMNH).