Myrmecina vieti

The species has been found under stones.

Identification
Okido, Ogata, and Hosoishi (2020) - A member of the Myrmecina vieti complex. Among these species, M. vieti is distinguished by its long and smooth petiole.

Distribution based on Regional Taxon Lists
Oriental Region: Vietnam.

Nomenclature

 * . Myrmecina vieti Okido, Ogata & Hosoishsi, 2020: 101, fig. 47 (w.q.) VIETNAM.

Worker
Holotype. TL 2.45, HL 0.58, HW 0.58, CI 100, SL 0.53, SI 92, PW 0.40, ML 0.64. Paratype. TL 2.61, HL 0.62, HW 0.62, CI 99, SL 0.51, SI 83, PW 0.43, ML 0.72 (1 measured).

Head subrectangular, as long as broad in full-face view; median portion of occipital margin moderately 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 short, followed by 4-6 small teeth and a stout basal tooth bearing blunt apex. Dorsal surface of clypeus not concave; median portion of anterior margin weakly projected with blunt and distinct median process; lateral portion raised into a sharp ridge of shield wall on each side, in front of antennal insertions. Anterior dorsal surface of labrum with paired denticles fused with each other at base. Frontal carinae present, running back to or beyond level of posterior margin of eyes, but frequently unclear. Eyes very small, varying in size with maximum diameter 0.05 mm and 5-7 ommatidia. Antennal scape short, just reaching posterolateral corner of head; antennal flange fully developed.

Dorsal outline of mesosoma slightly convex in profile. Pronotum without denticles; anterior ventrolateral portion more or less angulate. Eumetanotal spine small but distinct. Propodeal spine triangular, directing upward and backward, not reaching vertical posteriormost limit of the propodeum in profile. Propodeal lobe low. Propodeal spiracle large, situated near posterior margin of propodeum, apart from margin by its diameter. Petiole longer than high in profile; dorsal crest absent; subpetiolar process projecting forward with acute apex; ventral outline concave; Postpetiole broader than petiole in dorsal view; lateral margin straight; dorsal outline flattened in profile; ventral outline projected forward with acute apex at anterior portion in profile.

Anterior margin of gaster concave in dorsal view.

Head with irregular rugae which are thin; ventrolateral portion punctured weakly without rugae. Mandibles smooth and shining, sometimes with yellow spots on anterodorsal surface. Clypeus smooth and shining. Mesosoma with wavy rugae longitudinally. Petiole and postpetiole almost smooth and shining. Head and mesosoma with sparse pilosity, hairs of head and pronotum as long as propodeal spines. Pilosity of petiole and postpetiole as long as that of mesosoma; ventral surface with or without hairs. Head, mesosoma, petiole and postpetiole reddish brown, gaster dark reddish brown.

Type Material
Holotype worker, VIETNAM: Bavi N. P., 600 m alt., Ha Tai Prov., 12. xi. 1999, VN99-HO-090 (H. Okido). Paratypes. 4 workers with same data as holotype ( and ); numerous workers and 1 queen (dealate) with same data as holotype but 670m alt., 21°03´N x 105°22´E, 12. xi. 2001, VN01-HO-111 (, KUEC, KUIC, ).