Aenictus jawadwipa, Jaitrong & Yamane, 2013

Jaitrong, Weeyawat & Yamane, Seiki, 2013, The Aenictus ceylonicus species group (Hymenoptera, Formicidae, Aenictinae) from Southeast Asia, Journal of Hymenoptera Research 31, pp. 165-233 : 192-193

Aenictus jawadwipa sp. n. Fig. 23A-C

Type material examined.

Holotype. INDONESIA: Worker from W. Java, Cibodas Botanical Garden, 29.XI.2009, leg. W. Jaitrong, WJT09-ID16 (MZB). Paratypes. Forty-three workers, same data as holotype (BMHN, MCZC, MZB, SKYC, THNHM).

Non-type material examined.

MALAYSIA: E. Malaysia, Borneo, Sarawak, Lambir N.P., 8 ha Plot, 26.VI.2004, leg. Sk. Yamane, SR04-SKY-13 (SKYC, THNHM); E. Malaysia, Borneo, Sabah, Tawau Hills N.P., 12.VII.1996, leg. Sk. Yamane, SB96-SKY-29 (SKYC, THNHM); E. Malaysia, Borneo, Sabah, Sepilok Forest, 27.VIII.1995, leg. Sk. Yamane (SKYC, THNHM); E. Malaysia, Borneo, Sabah, Kinabalu, Poring, 16.III.1995, leg. Sk. Yamane (SKYC).

Worker measurements

(Holotype and paratype workers, n = 10): TL 2.40-2.90 mm; HL 0.53-0.58 mm; HW 0.48-0.53 mm; SL 0.40-0.45 mm; ML 0.78-0.88 mm; PL 0.20-0.23 mm; CI 90-91; SI 84-86.

Description of worker

(holotype and paratypes). Head in full-face view slightly longer than broad, sides convex, posterior margin weakly convex; occipital margin bearing a carina. Antennal scape relatively short, reaching 2/3 of head length. Frontal carina relatively long, slightly extending beyond the level of posterior margin of torulus. Parafrontal ridge feeble and incomplete. Anterior clypeal margin feebly concave. Masticatory margin of mandible with large acute apical tooth followed by a medium-sized subapical tooth, and 4 denticles; basal margin almost straight. Maximum width of gap between anterior clypeal margin and mandibles about 1.9 times as broad as maximum width of mandible. Promesonotum strongly convex dorsally and sloping gradually to metanotal groove; mesopleuron relatively long, not clearly demarcated from metapleuron; metapleural gland bulla relatively small, its maximum diameter about 1.6 times as long as distance between propodeal spiracle and metapleural gland bulla. Propodeum in profile relatively long, with straight dorsal outline; propodeal junction acutely angulated, overhanging the declivitous face of propodeum; the declivity widely and shallowly concave, encircled with a distinct rim. Petiole almost as long as high, seen in profile its node short and dorsal outline convex; subpetiolar process developed, with anteroventral and posteroventral corners angulated, margin connecting anterior and posterior corners strongly concave. Postpetiole slightly smaller than petiole, with its dorsal outline convex.

Head and gaster entirely smooth and shiny. Mandible very finely striate. Basal portion of antennal scape microreticulate, 2/3 apical smooth and shiny. Pronotum entirely smooth and shiny except for anteriormost portion densely punctate; mesopleuron, metapleuron, propodeum, and petiole reticulate; in addition mesopleuron and metapleuron with 3-4 longitudinal or irregular rugae; anterior, lateral and posterior faces of postpetiole reticulate, but its dorsum smooth and shiny.

Head and mesosoma dorsally with relatively dense standing hairs mixed with decumbent hairs; longest pronotal hair 0.25-0.28 mm long. Head, petiole, gaster, and legs yellowish brown; mesosoma reddish brown.

Etymology.

The specific name is after the type locality, Java Island (in Sanscrit).

Distribution.

Borneo (Sabah and Sarawak) and W. Java ( Fig. 26B ).

Bionomics.

The type series of this species was collected from highland (ca. 1,300 m alt., W. Java) by a stream in a primary forest. The non-type colonies from Borneo were all collected from lowland primary forests (200-700 m alt.). This species was active in both the day and night.

Remarks.

Aenictus jawadwipa is most similar in general appearance to Aenictus eguchii . See under Aenictus eguchii .

Figures

Figure 23. Aenictus jawadwipa (specimen from Java). A Head in full-face view B body in dorsal view C body in profile.

Figure 26. Distribution of Aenictus ceylonicus group. A Aenictus baliensis, Aenictus gonioccipus, Aenictus longicephalus, Aenictus minipetiolus, Aenictus pilosus B Aenictus appressipilosus, Aenictus cylindripetiolus, Aenictus itoi, Aenictus jawadwipa, Aenictus sundalandensis.