Aenictus camposi

This species is found from lowland to highland and in natural and disturbed forests. Rosciszewski and Maschwitz (1994) reported that A.camposi fed on other small ant species such as five species of Paratrechina and Prenolepis naoroji in Pasoh Forest Reserve. Malay Peninsula. (Jaitrong et al. 2010)

The type series was collected from a bivouac beneath the bark of a fallen tree.

Identification
Jaitrong et al. (2010) - A member of the wroughtonii group. Aenictus camposi is most similar to Aenictus biroi (see under A. biroi) and Aenictus vieti. It is easily distinguished from A. vieti as follows: the declivity of propodeum is broader with more rounded apex in A. vieti (narrower and distinctly tapering above in A. camposi); subpetiolar process with anteroventral corner acutely angulate in A. vieti (unarmed in A. camposi).

Distribution
Aenictus camposi ranges from the Philippines through Sundaland to southern part of continental Southeast Asia.

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

Biology
Wheeler and Chapman (1930) report a number of workers were taken at Dumaguete from a small colony that was foraging in the open on the ground.

Nomenclature

 * . Aenictus camposi Wheeler, W.M. & Chapman, 1925: 48, pl. 1, figs. 3, 4 (w.) PHILIPPINES (Negros I.).
 * Type-material: lectotype worker (by designation of Jaitrong, et al. 2010: 38), 5 paralectotype workers.
 * Type-locality: lectotype Philippines: Negros, Negros Oriental Prov., Horns of Negros, Dumaguete, 1200 m. (J.W. Chapman); paralectotypes with same data.
 * Type-depository: MCZC.
 * Status as species: Wheeler, W.M. 1930g: 208 (in key); Chapman & Capco, 1951: 11; Chapman, 1963: 262; Wilson, 1964a: 452; Baltazar, 1966: 231; Bolton, 1995b: 59; Wu, J. & Wang, 1995: 51; Zhou & Chen, 1999: 63 (in key); Zhou, 2001b: 62; Jaitrong & Nabhitabhata, 2005: 11; Wang, W. 2006: 637 (in key); Jaitrong, et al. 2010: 38 (redescription); Pfeiffer, et al. 2011: 32; Guénard & Dunn, 2012: 22; Jaitrong & Ruangsittichai, 2018: 113 (in key).
 * Distribution: Brunei, Indonesia (Sumatra), Malaysia (Sabah, Sarawak), Philippines (Luzon, Negros), Thailand.

Worker
Wilson (1964) - Syntype: HW 0.43 mm, HL 0.58 mm, SL 0.59 mm. Antenna 10-segmented. Mandible typical in form. Clypeus feebly convex, entire, dentate. Parafrontal ridge distinct but only 0.1 mm long. Propodeal junction acutely angulate. Subpetiolar process a low, right-angular lobe projecting anteriorly. Pilosity overall sparse, longest pronotal hairs only about 0.10 mm long.

Head smooth and shining. Mesosoma smooth and shining except for mesopleuron and propodeum, which are microreticulate and feebly shining. Also, there are short longitudinal rugae distributed along the propodeal junction. Concolorous clear yellow.

Jaitrong et al. (2010) - (10 non-type workers): TL 2.6-2.7 mm; HL 0.55-0.58 mm; HW 0.43-0.45 mm; SL 0.55-0.58 mm; ML 0.85-0.88 mm; MTL 0.55-0.58 mm; PL 0.25-0.28 mm; CI 74-82: SI 122-135.

Head in full-face view clearly longer than broad, with its sides and posterior margin slightly convex. Antennal scape long, extending beyond posterior corner of head; antennal segment II slightly shorter than III, but longer than each of IV-VI; the last (X) almost as long as VIII and IX combined and as long as II and III combined. Frontal carina short, thin and not extending beyond the level of posterior margin of torulus. Clypeus short, with its anterior margin bearing 5-7 denticles. Mandible with the apical tooth large and curved followed by 10-12 minute teeth on masticatory margin. Mesosoma in profile with pronotum convex dorsally and sloping gradually to metanotal groove. Propodeum in profile lower than promesonotum, with nearly straight dorsal outline; propodeal junction angulate; declivity of propodeum seen from back distinctly tapering above shallowly concave and encircled with a thin rim. Petiole in profile slightly longer than high, with the dorsal outline rather flat, seen from above relatively narrow, almost parallel-sided: subpetiolar process present with its ventral outline convex, without angle or tooth: postpetiole slightly smaller than petiole: its node short, almost as long as broad, in profile elevated posteriorly.

Head, antennal scape, pronotum, petiole, postpetiole, gaster, femora and tibiae of legs entirely or extensively smooth and shiny. Antennal flagellum densely punctate. The anteriormost portion of pronotum punctate: mesothorax and propodeum with dense punctures; metapleuron partly or extensively smooth: propodeal dorsum with short longitudinal rugae along the angle.

Body with relatively sparse standing hairs mixed with sparse short hairs over the surface; length of the longest pronotal hair 0.10-0.13 mm. Head, waist, gaster, antenna and legs yellow, mesosoma pale brown.

Type Material
Jaitrong et al. (2010) - Six syntypes on three pins (one on a pin, two on another, three on the other) from Horns of Negros, 1,200 m alt., Dumaguete, Oriental Negros Province, Philippines (, examined). The single specimen mounted on one pin is selected as the lectotype, the others as paralectotypes.

Determination Clarifications
Jaitrong et al. (2010) - Zhou (2001) recorded this species from Guangxi and some other provinces in China. However, according to his figs. 82 and 83 it is most probably Aenictus vieti.

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. 1963. Some new and interesting Philippine ants (Hymenoptera: Formicidae). Philipp. J. Sci. 92: 247-263.
 * 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
 * Eguchi K., and S. Yamane. 2003. Species diversity of ants (Hymenoptera, Formicidae) in a lowland rainforest, northwestern Borneo. New Entomol. 52(1,2): 49-59.
 * Guénard B., and R. R. Dunn. 2012. A checklist of the ants of China. Zootaxa 3558: 1-77.
 * Hashimoto Y., Y. Morimoto, and M. Mohamed. 2003. Species List of Ground and Leaf Litter Ants Collected in Lower Kinabatangan. Pp 13-18. In Lower Kinabatangan Scientific Expedition 2002, 176 pp. ISBN-13: 983-2369-11-8
 * Herwina H., and K. Nakamura. 2007. Ant species diversity study using pitfall traps in a small yard in Bogor Botanic garden, West Java, Indonesia. Treubia 35: 99-116.
 * Hua Li-zhong. 2006. List of Chinese insects Vol. IV. Pages 262-273. Sun Yat-sen university Press, Guangzhou. 539 pages.
 * Huang J. 2005. The Fauna and taxonomy of the Formicidae (Insecta: Hymenoptera) from Hunan Province, P. R. China. PhD Thesis, Southwest Agricultural University China Chongqing, 247 pp.
 * Jaitrong W. 2015. A revision of the Thai species of the ant genus Aenictus Shuckard, 1840 (Hymenoptera: Formicidae: Dorylinae). The Thailand Natural History Museum Journal 9(1): 1-94.
 * Jaitrong W.; Nabhitabhata, J. 2005. A list of known ant species of Thailand. The Thailand Natural History Museum Journal 1(1): 9-54.
 * Jaitrong W.; Yamane, S.; Wiwatwitaya, D. 2010. The army ant Aenictus wroughtonii (Hymenoptera, Formicidae, Aenictinae) and related species in the Oriental region, with descriptions of two new species. Japanese Journal of Systematic Entomology 16:33-46.
 * Li Z.h. 2006. List of Chinese Insects. Volume 4. Sun Yat-sen University Press
 * Matsumoto T., T. Itioka, S. Yamane, and K. Momose. 2009. Traditional land use associated with swidden agriculture chnages encounter rates of the top predator, the army ant, in Southern Asian tropical rain forests. Biodivers. Conserv. 18: 3139-3151.
 * Ogata K. 2005. Asian ant inventory and international networks. Report on Insect inventory Project in Tropic Asia TAIIV: 145-170.
 * 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
 * Wheeler W. M. 1930. Philippine ants of the genus Aenictus with descriptions of the females of two species. Journal of the New York Entomological Society 38: 193-212.
 * Wilson E. O. 1964. The true army ants of the Indo-Australian area (Hymenoptera: Formicidae: Dorylinae). Pacific Insects 6: 427-483.
 * Yamane S.; Nona, A. R. 1994. Ants from Lambir Hills National Park, Sarawak. Pp. 222-226 in: Inoue, T.; Hamid, A. A. (eds.) 1994. Plant reproductive systems and animal seasonal dynamics. Long-term study of dipterocarp forests in Sarawak. Kyoto: Center for Ecological Research, Kyoto University, vii + 255 pp.
 * Zhang R. J., L. W. Liang, and S. Y. Zhou. 2014. An analysis on the ant fauna of Nonggang Nature Reserve in Guangxi, China. Journal of Guangxi Normal university: Natural Science Edition 32(3): 86-93.
 * Zhou S.-Y. and Chen Z. 1999. The ant genus Aenictus Shuckard from Guangxi (Hymenoptera: Formicidae). Guangxi Sciences 6(1): 63-64.