Myrmecina sundanica

The species inhabits litter. Ergatogynes are present in this species.

Identification
Okido, Ogata, and Hosoishi (2020) - Distinguished by a sculptured first gastral-tergum with a simple anterior margin, and smooth and shining first gastral-sternum.

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

Nomenclature

 * . Myrmecina sundanica Okido, Ogata & Hosoishsi, 2020: 97, fig. 45 (w.) INDONESIA.

Worker
Holotype worker. TL 2.45, HL 0.56, HW 0.50, CI 89, SL 0.45, SI 90, PW 0.34, ML 0.62. Paratype worker. TL 2.39, HL 0.54, HW 0.51, CI 94, SL 0.43, SI 84, PW 0.35, ML 0.64 (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 5 small teeth and a blunt basal tooth. Dorsal surface of clypeus not concave; median portion of anterior margin feebly projected with a small median process; lateral portion simple, lacking sharp ridge in front of antennal insertions. Anterior dorsal surface of labrum with paired small denticles bearing acute apex, close to each other. Frontal carinae virtually absent, indistinguishable from rugae on dorsum of head. Eyes extremely small circularly and moderately convex with maximum diameter 0.06 mm, with 9 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 without denticles on dorsolateral portion; anterior portion marginate; anterior ventrolateral portion slightly projected. 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, apart from margin by its diameter. Petiole short, slightly longer than high in profile, longer than broad in dorsal view; dorsal crest located at midlength in profile; subpetiolar process present but much reduced, usually bearing acute anterior apex. Postpetiole broader than petiole, 1.5 times as broad as its length except for helcium in dorsal view; anterolateral margin usually rounded; anterior portion slightly raised in profile; ventral outline projected rectangularly with acute anterior apex.

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

Head weakly punctured with almost staight rugae which are thin; ventrolateral portion usually smooth and shining, sometimes punctured. Clypeus smooth and shining. Mesosoma weakly punctured with almost straight rugae which are thin and longitudinal. Forecoxa smooth and shining. Petiole and postpetiole with weak irregular rugae. First gastral tergum punctured dorsally. First gastral sternum usually smooth and shining, rarely with longitudinal rugae at anterior median portion; lateral portion smooth and shining. Head with dense and short pilosity on dorsum. Mesosoma with dense and short pilosity on dorsum, hairs of pronotum much shorter than propodeal spine. Petiole without hairs on ventral surface. Postpetiole with 2-4 hairs on ventral surface. Body black to reddish brown, mandibles, antennae and legs yellowish brown.

Type Material
Holotype worker, INDONESIA: Kebun Raya, Bogor, W-Java, 15. iv. 1997, FI97-635 (F. Ito). Paratypes. 5 workers and 1 ergatogyne with same data as holotype; 1 worker and 2 ergatogynes with same data as holotype but FI97- 616; 7 workers and 1 male with same data as holotype but 3. iv. 1997, FI97-545; 2 workers and 1 ergatogyne with same data as holotype but 1. iii. 1997, FI97-38.

Determination Clarifications
This species corresponds to Myrmecina sp. F (Ito et al. 2001).