Crematogaster longipilosa

This species inhabits disturbed to developed forests, and nests in soil.

Identification
Hosoishi and Ogata (2016) - In the worker this species is very distinct among the Crematogaster binghamii group in having developed propodeal spines (PSL 0.13–0.16 vs. 0–0.07 in the others).

Distribution
S. Thailand, Malaysia (Peninsula) and Indonesia (Kalimantan, Java, Sumatra).

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

Nomenclature

 * . Crematogaster longipilosa Forel, 1907a: 24 (w.) WEST MALAYSIA.
 * Type-material: lectotype worker (by designation of Hosoishi & Ogata, 2016a: 584), 1 paralectotype worker.
 * [Note: original syntypes most probably exceed this number and are probably also present in HNHM.]
 * Type-locality: lectotype Malaysia: Malacca, Kuala Lumpur (L. Biró), paralectotype with same data.
 * Type-depository: MHNG.
 * Forel, 1911d: 383 (q.m.); Viehmeyer, 1916a: 124 (q.).
 * Combination in C. (Orthocrema): Emery, 1922e: 132.
 * Status as species: Forel, 1911a: 24; Forel, 1911d: 383; Forel, 1912n: 57; Viehmeyer, 1914a: 113; Viehmeyer, 1916a: 124; Wheeler, W.M. 1919e: 73; Emery, 1922e: 132; Crawley, 1924: 394; Menozzi, 1935a: 113 (in key); Chapman & Capco, 1951: 98; Bolton, 1995b: 156; Pfeiffer, et al. 2011: 45; Hosoishi & Ogata, 2016a: 584 (redescription); Khachonpisitsak, et al. 2020: 91.
 * Distribution: Indonesia (Java, Kalimantan, Mentawei, Sumatra), Malaysia (Peninsula), Thailand.

Worker
Hosoishi and Ogata (2016) - (n=10) HW 0.60–0.69; HL 0.63–0.71; CI 95–97; SL 0.52–0.58; SI 84–89; EL 0.15–0.18; PW 0.37–0.40; WL 0.71–0.80; PSL 0.13–0.16; PtL 0.25–0.29; PtW 0.20–0.23; PtH 0.16–0.19; PpL 0.16–0.19; PpW 0.20–0.24; PtHI 62–73; PtWI 79–92; PpWI 111–137; WI 95–105.

Workers monomorphic. Head subquadratic in full-face view. Mandibles with four teeth arranged at an equal distance, apical and subapical teeth large, basal two teeth smaller. Anterior clypeal margin convex in medial portion. Compound eyes distinctly projecting beyond lateral margins of head in full-face view. Scapes reaching posterolateral corners of head.

Pronotal collar with weakly concave anterior margin in dorsal view, distinctly lower than pronotum in lateral view. Pronotal dorsum without distinct ridges laterally. Mesonotal dorsum with lateral ridges that irregularly extend posteriad to tips of propodeal spines; the ridges forming pair of small triangular processes (angles) between dorsal and declivity faces of mesonotum (this condition is more easily seen with mesosoma in lateral view). Pronotum and mesonotum in lateral view not clearly forming continuous dorsal outline. Metanotal groove in dorsal view transverse, almost straight in median portion, forming deep concavity that is laterally margined by lamellate ridges. Propodeal spiracles oval, situated at posterolateral corners of propodeum, apart from (or slightly touching) metapleural gland bullae. Propodeal spines developed, longer than diameter of propodeal spiracles, in dorsal view directed posteriad.

Petiole in dorsal view with subparallel sides and narrow anteriorly, longer than wide. Posterior portion of petiole without distinct process in lateral view. Subpetiolar process weakly developed as blunt process. Postpetiole in lateral view with weakly convex dorsum, as high as petiole, in dorsal view as wide as petiole, globular, not bilobed. Subpostpetiolar process undeveloped, but venter of postpetiole weakly convex.

Integument essentially smooth and shining. Dorsal surface of head smooth and shining, but with rugulae on surrounding region of antennal sockets. Mandibles with feeble rugulae and smooth interspaces. Clypeus generally smooth and shining, but with one to two distinct pairs of longitudinal rugulae; rugulae not extending to posterior clypeal margin. Costulate rugulae present on malar region. Dorsal and lateral surfaces of pronotum smooth and shining; anterolateral shoulders of pronotum without rugulae. Mesopleura generally smooth and shining. Rugula on higher portion of mesopleura extending to small pit of mesothoracic spiracles. Dorsal surface of propodeum generally smooth and shining, but few longitudinal rugulae on anterior areas. Dorsal surface of petiole smooth and shining. Lateral surface of petiole generally smooth, but with one longitudinal rugula running from spiracles to posterior margin. Dorsal and lateral surfaces of postpetiole smooth and shining.

Standing pilosity abundant. Dorsal face of head with erect to suberect setae abundantly. Clypeus with three pairs of long setae on anterior portion, one directed upward, one downward. the other laterally below antennal sockets. Anterior clypeal margin with single long setae medially and one pair of long setae laterally, and short setae laterally. Gena (malar space) with some suberect setae near mandibular insertion. Scapes with suberect to decumbent setae; short setae basally and long setae distally. Mesosoma with seven to eight distinct pairs of long erect and stout setae (ps1PN, ps2PN, psaMN, pspMN, psPR, ps1PS, and one to two ps2PS) that are much longer than other erect setae. Posterolateral tubercles of petiole posteriorly with three pairs of long setae. Postpetiole with four pairs of long setae on disc anterodorsally, anterolaterally, posteromedially and posteriorly. Fourth abdominal tergite with erect to suberect setae abundantly, but no decumbent to appressed setae.

Body yellow to brown. All flagellar segments yellow.

Type Material
Hosoishi and Ogata (2016) - Syntype workers, Kuala Lumpur, Malaysia (Biró) (, examined). One syntype worker (top specimen of two on one pin) in MHNG here designated Lectotype.

Determination Clarifications
This species corresponds to C. sp. 51 of SKY (Ito et al., 2001).

References based on Global Ant Biodiversity Informatics

 * Chapman, J. W., and Capco, S. R. 1951. Check list of the ants (Hymenoptera: Formicidae) of Asia. Monogr. Inst. Sci. Technol. Manila 1: 1-327
 * Crawley W.C. 1924. Ants from Sumatra, with biological notes by Edward Jacobson. Annals and Magazine of Natural History (9)13: 380-409
 * Forel A. 1911. Fourmis de Bornéo, Singapore, Ceylan, etc. récoltées par MM. Haviland, Green, Winkler, Will, Hose, Roepke et Waldo. Rev. Suisse Zool. 19: 23-62.
 * Hosoichi S., and K. Ogata. 2016. Systematics and biogeography of the ant genus Crematogaster Lund subgenus Orthocrema Santschi in Asia (Hymenoptera: Formicidae). Zoological Journal of the Linnean Society 176: 547–606.
 * Hosoishi S. and K. Ogata. 2009. A check list of the ant genus Crematogaster in Asia (Hymenoptera: Formicidae). Bull. Inst. Trop. Agr. Kyushu Univ. 32: 43-83.
 * Malsch A. K. F., K. Rosciszewski, and U. Maschwitz. 2003. The ant species richness and diversity of a primary lowland rain forest, the Pasoh Forest reserve, West Malaysia. in T. Okuda, N. Manokaran, Y. Matsumoto, K. Niiyama, S. C. Thomas, and P. S. Ashton, eds. Pasoh: Ecology and Natural History of a Southeast Asin Lowland Tropical Rain Forest, pp 347-374.
 * Pfeiffer M.; Mezger, D.; Hosoishi, S.; Bakhtiar, E. Y.; Kohout, R. J. 2011. The Formicidae of Borneo (Insecta: Hymenoptera): a preliminary species list. Asian Myrmecology 4:9-58
 * Philpott S.M., P. Bichier, R.A. Rice, and R. Greenberg. 2008. Biodiversity conservation, yield, and alternative products in coffee agroecosystems in Sumatra, Indonesia. Biodivers. Conserv. 17: 1805-1820. Data obtained from Stacy Philpott
 * Wheeler W. M. 1919. The ants of Borneo. Bulletin of the Museum of Comparative Zoology 63:43-147.