Dolichoderus affinis

Viehmeyer 1916: 141 - Malay Peninsula: beneath the bark of a branch of a dead tree; Le Pelley 1943: 79 - Philippines and Java: trophobiosis with Planococcus lilacinus (Cockerell) (Pseudococciclae); Manmohini Devi et al. 1987: 104 - India: trophobiosis with the aphids, Greenidea formosana heeri Raychaudhuri and Aphis gossypii Glover. Dill 2002 - often in trophobiotic associations with different pseudococcids, aphids (e. g. Pseudoregma sp.) and membracids [e.g. Ebhul varius (Walker)]; polygynous, nest in hollow, dead tree branch. Heterick & Kitching (2022) collected this species in the canopy of a lowland dipterocarp forest in Brunei.

Identification
Dill (2002) - Morphologically near Dolichoderus thoracicus except for posterior margin of ascending dorsal face of propodeum more sharply edged and, in profile, distinctly overhanging the concavely curved declivity. Regarding this character, the affinis workers somewhat resemble those of Dolichoderus pilinomas of the Dolichoderus cuspidatus group. However, the propodeum of the latter rises distinctly higher.

Distribution based on Regional Taxon Lists
Indo-Australian Region: Borneo, Brunei Darussalam, Indonesia, Malaysia, Philippines, Singapore. Oriental Region: India, Laos, Myanmar, Vietnam. Palaearctic Region: China.

Biology
Malay Peninsula: polygynous; keeping aphids; nest in bamboo internodes and underneath loose bark; exuviae of Microdon pupae (Diptera: Syrphidae) in one nest; queens orientate towards light. As reported by Viehmeyer 1916 for the synonym ''D. affinis nigricans.

Nomenclature

 *  affinis. Dolichoderus affinis Emery, 1889b: 508, pl. 11, fig. 20 (w.) MYANMAR. Viehmeyer, 1916a: 141 (q.). Combination in D. (Hypoclinea): Emery, 1894c: 229. Senior synonym of nigricans: Xu, 1995a: 36. Current subspecies: nominal plus glabripes, mus.
 * nigricans. Dolichoderus affinis var. nigricans Emery, 1895k: 474 (w.) MYANMAR. Junior synonym of affinis: Xu, 1995a: 36.

Description
Worker

Bingham (1903): Reddish brow n to dark brown, the mandibles, antennae and legs lighter in colour; head, thorax and abdomen sparsely pilose and pubescent. Head shining, very finely closely punctate, longer than broad; cheeks and front very convex; mandibles proportionately large, the apical tooth long, acute and slightly curved; clypeus, antennae and eyes as in D. bituberculatus. Thorax: the pronotum slightly flit and anteriorly margined ; the mesonotum raised, somewhat flat, indistinctly medially sulcate ; metanotum slightly convex and sloping from back to front, its apical portion truncate and concave; the whole thorax irregularly but very distinctly punctured, wrinkled and sculptured, but not so coarsely as in D. bituberculatus; legs long, rather markedly pilose. Node of the pedicel inclined forward. thick at base, transverse above; abdomen somewhat elongately oval, smooth and shining, very convex above.

Length: 3.5 - 4 mm

References based on Global Ant Biodiversity Informatics

 * Bhoje P. M., K. Shilpa, and T. V. Sathe. 2014. Diversity of ants (Hymenoptera: Formicidae) from Kolhapur district of Maharashtra, India. Uttar Pradesh J. Zool. 34(1): 23-25.
 * 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
 * Chen Y. Q., Q. Li, Y. L. Chen, Z. X. Lu, X. Y. Zhou. 2011. Ant diversity and bio-indicators in land management of lac insect agroecosystem in Southwestern China. Biodivers. Conserv. 20: 3017-3038.
 * Chen Y., C. W. Luo, H. W. Li, Y. J. Liu, H. F. Zheng, and F. C. Yang. 2013. Investigation of ant species and distribution on Wuliang Mountain. Journal of Henan Agricultural Sciences 42(5): 118-122.
 * Cheng D., Z. Chen, and S. Zhou. 2015. An analysis on the ant fauna of Jinzhongshan Nature Reserve in Gunagxi, China. Journal of Guangxi Normal University: Natural Science Edition 33(3): 129.137.
 * Collingwood C.A. 1970. Formicidae (Hymenopter: Aculeata) of Nepal. Himalaya Khumbu Himal, 3: 371-388.
 * Dill M. 2002. Taxonomy of the migrating herdsmen species of the genus Dolichoderus Lund, 1831, with remarks on the systematics of other southeast-Asian Dolichoderus. Pp. 17-113 in: Dill, M.; Williams, D. J.; Maschwitz, U. 2002. Herdsmen ants and their mealybug partners. Abhandlungen der Senckenbergischen Naturforschenden Gesellschaft 557: 1-373.
 * Dill M., D.J. Williams, and U. Maschwitz. 2002. Herdsmen ants and their mealybug partners. Abh. senckenberg. naturforsch. Ges. 557: 1-373.
 * Emery C. 1913. Hymenoptera. Fam. Formicidae. Subfam. Dolichoderinae. Genera Insectorum 137: 1-50.
 * Fontanilla A. M., A. Nakamura, Z. Xu, M. Cao, R. L. Kitching, Y. Tang, and C. J. Burwell. 2019. Taxonomic and functional ant diversity along tropical, subtropical, and subalpine elevational transects in southwest China. Insects 10, 128; doi:10.3390/insects10050128
 * General D. M., and G. D. Alpert. 2012. A synoptic review of the ant genera (Hymenoptera, Formicidae) of the Philippines. Zookeys 200: 1-111.
 * Guénard B., and R. R. Dunn. 2012. A checklist of the ants of China. Zootaxa 3558: 1-77.
 * Herwina H., R. Satria, Yaherwandi, and Y. Sakamaki. 2018. Subterranean ant species diversity (Hymenoptera: Formicidae) in educational and biological research forest of universitas andalas, Indonesia. Journal of Entomology and Zoology Studies 6(1): 1720-1724.
 * Hua Li-zhong. 2006. List of Chinese insects Vol. IV. Pages 262-273. Sun Yat-sen university Press, Guangzhou. 539 pages.
 * Jaitrong W., B. Guenard, E. P. Economo, N. Buddhakala, and S. Yamane. 2016. A checklist of known ant species of Laos (Hymenoptera: Formicidae). Asian Myrmecology 8: 1-32. DOI: 10.20362/am.008019
 * Li Q., Y. Chen, S. Wang, Y. Zheng, Y. Zhu, and S. Wang. 2009. Diversity of ants in subtropical evergreen broadleaved forest in Pu'er City, Yunnan. Biodiversity Science 17(3): 233-239.
 * Li Z.h. 2006. List of Chinese Insects. Volume 4. Sun Yat-sen University Press
 * Liu X. 2012. Taxonomy, diversity and spatial distribution characters of the ant family Formicidae (Insecta: Hymenoptera) in southeastern Tibet. PhD Thesis 139 pages
 * Liu X., Z. Xu, N. Yu, and C. Zhang. 2016. Distribution patterns of ant species ( Hymenoptera: Formicidae) in Galongla Mountains and Medog Valley of Southeastern Tibet. Scientia Silvae Sinicae 52(11): 88-95.
 * Lu Z., B. D. Hoffmann, and Y. Chen. 2016. Can reforested and plantation habitats effectively conserve SW China’s ant biodiversity? Biodivers. Conserv. DOI 10.1007/s10531-016-1090-1
 * Mathew R. 2003. On Formicidae (Insecta: Hymenoptera) of Nongkhyllem Wild Life Sanctuary, Ri-Bhoi District, Meghalaya. Records of the Zoological Survey of India 101:195-207.
 * Menozzi C. 1930. Formiche di Sumatra raccolte dal Prof. J. C. van der Meer Mohr. Miscellanea Zoologica Sumatrana 47: 1-5.
 * Mezger D., and M. Pfeiffer. 2011. Influence of the arrival of Anoplolepis gracilipes (Hymenoptera: Formicidae) on the composition of an ant community in a clearing in Gunung Mulu National Park, Sarawak, Malaysia. Asian Myrmecology 4: 89-98.
 * Overbeck H. 1924. A List of Ants from Singapore and Neighbouring Places. Journal of the Malayan Branch of the Royal Asiatic Society 2 (1): 25-40.
 * Pfeiffer M., D. Mezger, and J. Dyckmans. 2013. Trophic ecology of tropical leaf litter ants (Hymenoptera: Formicidae) - a stable isotope study in four types of Bornean rain forest. Myrmecological News 19: 31-41.
 * 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
 * Santschi F. 1920. Fourmis d'Indo-Chine. Annales de la Société Entomologique de Belgique 60: 158-176.
 * Santschi F. 1924. Fourmis d'Indochine. Opuscules de l'Institut Scientifique de l'Indochine 3: 95-117
 * Santschi F. 1928. Fourmis de Sumatra, récoltées par Mr. J. B. Corporaal. Tijdschrift voor Entomologie 71: 119-140.
 * Song Y., Z. Xu, C. Li, N. Zhang, L. Zhang, H. Jiang, and F. Mo. 2013. An Analysis on the Ant Fauna of the Nangun river Nature Reserve in Yunnan, China. Forest Research 26(6): 773-780.
 * Tanaka H. O., S. Yamane, and T. Itioka. 2012. Effects of a fern-dwelling ant species, Crematogaster difformis, on the ant assemblages of emergent trees in a Bornean tropical rainforest. Ann. Entomol. Soc. Am. 105(4): 592-598.
 * Tiwari R. N., B. G. Kundu, S. Roy Chowdhury, and S. N. Ghosh. 2003. Insecta: Hymenoptera: Formicidae. Fauna of Sikkim. Part 4. State Fauna Series. 9.Zool.Surv.India. i-iii, 1-512. Chapter pagination: 467-506.
 * Varghese T. 2004. Taxonomic studies on ant genera of the Indian Institute of Science campus with notes on their nesting habits. Pp. 485-502 in : Rajmohana, K.; Sudheer, K.; Girish Kumar, P.; Santhosh, S. (eds.) 2004. Perspectives on biosystematics and biodiversity. Prof. T.C. Narendran commemoration volume. Kerala: Systematic Entomology Research Scholars Association, xxii + 666 pp.
 * Wheeler W. M. 1921. Chinese ants collected by Prof. C. W. Howard. Psyche (Cambridge) 28: 110-115.
 * Wheeler W. M. 1930. A list of the known Chinese ants. Peking Natural History Bulletin 5: 53-81.
 * Xu Z. H., B. L. Yang, and G. Hu. 1999. Formicidae ant communities in fragments of montane rain forest in Xishuangbanna, China. Zoological Research 20(4): 288-293.
 * Xu Z. 1995. A taxonomic study of the ant genus Dolichoderus Lund in China (Hymenoptera Formicidae Dolichoderinae). Journal of Southwest Forestry College 15(1): 33-39.
 * Xu Z. 2001. Two new species of the ant genus Dolichoderus Lund from Yunnan, China (Hymenoptera: Formicidae). Acta Zootaxonomica Sinica 26(3): 355-360
 * Yan X.B. 2007. A Taxonomy Study on the Ant Genus Dolichoderus Lunder (Hymenoptera: Formicidae: Dolichoderinae) from China. Guangxi Normal University, Guangxi, China. 49 pages.
 * Zhang Z., M. Cao, X. Yang, X. Deng, and Y. She. 2000. A study on species diversity of ant in fragments of seasonal rain forest of Xishuangbanna, China. Zoological Research 21(1): 70-75.