Myrmecina maryatiae

Inhabits litter and under bark. Aoki & Ito (1997) reported that this species (as Myrmecina sp. B) had a myrmecophilous oribatid mite Protoribates myrmecophilus.

Identification
Okido, Ogata, and Hosoishi (2020) - Similar to species of the Myrmecina macrops complex, but distinguished by a sculptured head and short antennal scapes.

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

Nomenclature

 * . Myrmecina maryatiae Okido, Ogata & Hosoishsi, 2020: 70, fig. 32 (w.q.) MALAYSIA.

Worker
Holotype. TL 2.58, HL 0.62, HW 0.58, CI 92, SL 0.50, SI 86, PW 0.43, ML 0.66. Paratype. TL 2.37-2.80, HL 0.58-0.67, HW 0.53-0.62, CI 90-97, SL 0.48-0.53, SI 84-94, PW 0.38-0.45, ML 0.59-0.74 (24 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 concave; median portion of anterior margin slightly projected and concave without a median process; lateral portion simple, lacking sharp ridge in front of antennal insertions. Anterior dorsal surface of labrum with paired denticles, close to each other. Frontal carinae virtually absent, indistinguishable from rugae on dorsum of head. Eyes extremely large and moderately convex, varying in size with maximum diameter 0.11-0.16 mm and 7-10 ommatidia; malar space as long as diameter of eye in profile; distance between occipital margin and posterior margin of eye twice as long as diameter of eye. Antennal scape short, just reaching posterolateral corner of head; antennal flange fully developed.

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

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

Head with irregular rugae which are thin distinctly; ventrolateral portion smooth and shining. Clypeus smooth and shining, but posterior portion sculptured. Mesosoma with wavy rugae distinctly. Forecoxa smooth and shining. Petiole and postpetiole with a few rugae. First gastral segment smooth and shining. Head with relatively 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 2-4 hairs on ventral surface. Body usually black, mandibles, antennae and legs yellowish brown to black.

Type Material
Holotype worker, MALAYSIA: Ulu Gombak, 27. x. 1996, FI96-721, 19. ii. 1997 fixed (F. Ito). Paratypes. numerous workers, queens and males with same data as holotype; 15 workers and 1 queen with same data as holotype but vii-x. 1992, FI92MG502, no date for fix; numerous workers, queens and males with same data as holotype but vii-x. 1992, FI92MG565, no date for fix; numerous workers, queens and males with same data as holotype but 24. x. 1996, FI96-694; 32 workers, 1 queen and 1 male with same data as holotype but 24. x. 1996, FI96-698; numerous workers, queens and males with same data as holotype but 26. x. 1996, FI96-700; 4 workers, 1 queen and 2 males with same data as holotype but 28. x. 1996, FI96-729; numerous workers, queen and male with same data as holotype but 28. x. 1996, FI96-738; numerous workers, queens and males with same data as holotype but 28. x. 1996, FI96-740; 10 workers and 1 queen with same data as holotype but 18. vii. 1998, FI98-108, no date for fix (,, UMS).

Determination Clarifications
Corresponds to Myrmecina sp. B of Aoki & Ito (1997).