Aenictus alticola

Nothing is known about the biology of this species.

Identification
A member of the laeviceps species group. Jaitrong and Yamane (2011) - A. alticola is most similar to Aenictus luzoni in having the subpetiolar process low and anteriorly angulate; the ventral appendage not spiniform. However, this species is distinctly larger than the latter (HW 0.80–0.85 in A. alticola; 0.78 in A. luzoni). The ventral appendage of the subpetiolar process is high and subtriangular in A. alticola, but rudimentary, with the highest point at anterior portion in A. luzoni. Antennal scape is almost as long as or longer than head width in A. alticola (SI 100–106), while it is shorter than head width in A. luzoni (SI 97).

Distribution based on Regional Taxon Lists
Indo-Australian Region: Philippines.

Abundance
Rare

Castes
Only known from the worker caste.



Nomenclature

 * . Aenictus (Typhlatta) alticola Wheeler, W.M. & Chapman, in Wheeler, W.M. 1930g: 205, fig. 5a-d (w.) PHILIPPINES (Luzon I.).
 * Type-material: lectotype worker (by designation of Jaitrong & Yamane, 2011: 25), 20 paralectotype workers.
 * Type-locality: lectotype Philippines: Luzon, Bontoc, Polis Pass, 6000 ft (J.W. Chapman); paralectotypes with same data.
 * Type-depository: MCZC.
 * Status as species: Chapman & Capco, 1951: 12; Chapman, 1963: 263; Wilson, 1964a: 445; Baltazar, 1966: 231; Bolton, 1995b: 58; Jaitrong & Yamane, 2011: 25 (redescription).
 * Distribution: Philippines (Luzon).

Worker
Jaitrong and Yamane (2011) - Measurements. Worker lectotype and paralectotypes (n = 6): TL 4.35–4.75 mm; HL 0.90–1.00 mm; HW 0.80–0.85 mm; SL 0.78–0.88 mm; ML 1.43–1.50 mm; PL 0.30–0.35 mm; CI 84–87; SI 100–106.

Redescription (lectotype and paralectotypes). Head in full-face view clearly longer than broad, with sides slightly convex and posterior margin convex; occipital margin bearing a narrow collar. Antennal scape extending beyond midlength of head, but not reaching the posterolateral corner of head; antennal segments II–X each longer than broad; II slightly longer than each of III–VI; VII, VIII and IX combined almost as long as terminal segment (X). Frontal carina short, not reaching the level of the posterior margin of torulus. Parafrontal ridge short and ill defined, or absent. Anterior margin of clypeus convex and bearing 6–7 denticles. Masticatory margin of mandible with a large apical tooth followed by a medium-sized subapical tooth, 5–6 denticles, and a medium-sized basal tooth; basal margin sinuate with a series of 2–3 ill-defined denticles. Mesosoma rather elongate and stout; promesonotum in profile strongly convex dorsally and sloping to metanotal groove; metanotal groove very weak. Propodeal junction evenly rounded; declivity not margined dorsally and laterally. Petiole subsessile and short, its node almost as long as high and rounded dorsally; subpetiolar process well developed, triangular, its apex directed downward. Postpetiole shorter than petiole, with globular node.

Head entirely smooth and shiny. Mandible very finely striate except along masticatory and outer margins. Antennal scape almost smooth and shiny. Mososoma extensively smooth and shiny; upper portion of mesopleuron and metapleuron provided with about 10 longitudinal, irregular rugulae; dorsa of mesonotum and propodeum superficially sculptured; metanotal groove bearing short longitudinal rugulae; propodeal dorsum with several short longitudinal rugae in front of the junction. Petiole and postpetiole entirely smooth and shiny. Legs entirely smooth and shiny.

Head and mesosoma with relatively sparse standing hairs mixed with sparse short hairs over the surface; longest pronotal hair 0.20–0.25 mm long. Entire body reddish-brown except for vertex of head darker than other parts of body; ventral surface of antennal segments VII–X pale yellow. Typhlatta spot located anterior to occipital corner.

Type Material
Described from numerous workers taken by Dr. Chapman from a single large colony found raiding in Polis Pass, Bontoc, Luzon, at an altitude of 6,000 feet.

Jaitrong and Yamane (2011) - Twenty-one syntype workers on three pins (two on a pin, eight on another, eleven on the other) from Philippines, Luzon, Bontoc, Polis Pass, 1,800 m (, examined). One worker among them (top on the first pin) is selected as the lectotype, the others as paralectotypes. Collected by J.Chapman

References based on Global Ant Biodiversity Informatics

 * Borowiec M. L. 2016. Generic revision of the ant subfamily Dorylinae (Hymenoptera, Formicidae). ZooKeys 608: 1–280.
 * Chapman J. W. 1965.  Studies on the ecology of the army ants of the Philippines genus Aenictus Schuckard (Hymenoptera: Formicidae). Philippine Journal of Science. 93: 551-595.
 * Chapman, J.W. and S.R. Capco. 1951. Check list of the ants (Hymenoptera: Formicidae) of Asia. Monographs of the Institute of Science and Technology (Manila) 1: 1- 327