Strumigenys lyroessa

Known from rainforest and rubber plantations, with all specimens obtained from litter samples.

Identification
Bolton (2000) - A member of the lyroessa complex in the Strumigenys lyroessa-group. Three species within the lyroessa-complex lack a pronotal humeral hair and lack standing hairs on the dorsolateral margins of the mesonotum (Strumigenys aechme, lyroessa, Strumigenys tantilla). S. aechme separates from the other two by its lack of an apicoscrobal hair and its distinctive gastral pilosity. S. lyroessa is smaller than tantilla (compare measurements) and has remiform rather than spatulate hairs on the first gastral tergite.

Distribution based on Regional Taxon Lists
Oriental Region: Bhutan, India, Sri Lanka. Palaearctic Region: China.

Nomenclature

 *  lyroessa. Labidogenys lyroessa Roger, 1862a: 251, pl. 1, fig. 17 (w.) SRI LANKA. Combination in Strumigenys: Roger, 1863b: 40; in Labidogenys: Brown, 1948e: 103; in Strumigenys: Bolton, 1995b: 397. See also: Bolton, 2000: 872.

Worker
Bolton (2000) - TL 2.0-2.1, HL 0.47, HW 0.80, CI 80, ML 0.16-0.18, MI 27-32, SL 0.24, SI 51, PW 0.28-0.30, AL 0.54-0.55 (2 measured). Characters of lyroessa-complex. Upper scrobe margin and leading edge of scape with small curved spoon-shaped hairs; those on the former smaller than those on the latter. Apicoscrobal hair short and stiff, slightly thickened apically; posterior to this the dorsolateral margin without projecting hairs. Cephalic dorsum without standing hairs except for one or two very short hairs at apex of occipital lobe. Pronotal humeral hair absent and dorsal alitrunk entirely lacking standing hairs. Posterior half of first gastral tergite with a few stiff hairs that are feebly remiform. Surface of first gastral tergite otherwise with inconspicuous, widely scattered minute appressed pubescence.

Type Material
Bolton (2000) - Holotype worker, SRI LANKA (no type-material known to exist).

References based on Global Ant Biodiversity Informatics

 * Bolton, B. 2000. The Ant Tribe Dacetini. Memoirs of the American Entomological Institute 65
 * 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
 * Dad J. M., S. A. Akbar, H. Bharti, and A. A. Wachkoo. 2019. Community structure and ant species diversity across select sites ofWestern Ghats, India. Acta Ecologica Sinica 39: 219–228.
 * Dias R. K. S. 2002. Current knowledge on ants of Sri Lanka. ANeT Newsletter 4: 17- 21.
 * Dias R. K. S. 2006. Current taxonomic status of ants (Hymenoptera: Formicidae) in Sri Lanka. The Fauna of Sri Lanka: 43-52. Bambaradeniya, C.N.B. (Editor), 2006. Fauna of Sri Lanka: Status of Taxonomy, Research and Conservation. The World Conservation Union, Colombo, Sri Lanka & Government of Sri Lanka. viii + 308pp.
 * Dias R. K. S., K. R. K. A. Kosgamage, and H. A. W. S. Peiris. 2012. The Taxonomy and Conservation Status of Ants (Order: Hymenoptera, Family: Formicidae) in Sri Lanka. In: The National Red List 2012 of Sri Lanka; Conservation Status of the Fauna and Flora. Weerakoon, D.K. & S. Wijesundara Eds., Ministry of Environment, Colombo, Sri Lanka. p11-19.
 * Dias R. K. S., and K. R. K. Anuradha Kosgamage. 2012. Occurrence and species diversity of ground-dwelling worker ants (Family: Formicidae) in selected lands in the dry zone of Sri Lanka. J. Sci. Univ. Kelaniya 7: 55-72.
 * Emery C. 1897. Formicidarum species novae vel minus cognitae in collectione Musaei Nationalis Hungarici quas in Nova-Guinea, colonia germanica, collegit L. Biró. Természetrajzi Füzetek 20: 571-599.
 * Forel A. 1903. Les Formicides de l'Empire des Indes et de Ceylan. Part X. J. Bombay Nat. Hist. Soc. 14: 679-715.
 * Lu Z., K. Li, N. Zhang, and Y. Chen. 2017. Diversity and indicator species of leaf-litter ants in Eucalyptus grandis plantations and secondary natural forests. Forest Research 29(4): 576-580
 * 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. 1998. A report of fourty-one ant species newly recorded in China from Xishuangbanna District of Yunnan Province (Hymenoptera: Formicidae). Zhongguo Xue Shu Qi Kan Wen Zhai 4: 1119-1121.