Pseudolasius circularis Viehmeyer, 1916

Hamer, Matthew T., Lee, Jonathan Hon Chung, Tse, Cheung Yau Leo, Silva, Thiago S. R. & Guénard, Benoit, 2022, Remarkable diversity in a little red dot: a comprehensive checklist of known ant species in Singapore (Hymenoptera: Formicidae) with notes on ecology and taxonomy, Asian Myrmecology (e 015006) 15, pp. 1-152 : 66

publication ID	https://doi.org/10.20362/am.015006
DOI	https://doi.org/10.5281/zenodo.15474197
persistent identifier	https://treatment.plazi.org/id/03B68783-3114-FFE4-FD73-7A9CFBFCFB37
treatment provided by	Felipe
scientific name	Pseudolasius circularis Viehmeyer, 1916
status

Treatment

Pseudolasius circularis Viehmeyer, 1916 View in CoL

Material examined. Alate queen, males and workers, Nee Soon Swamp Forest, 16 Mar 1981, D.H. Murphy leg., DHM-SG81-Psel2, ZRC _ENT00027952.

Material not physically examined. Type queen – FOCOL2676 ( ZMHB) .

Literature. Type – Viehmeyer (1916); Overbeck (1924).

Localities. Bukit Timah Road; Nee Soon Swamp Forest.

Habitat/Ecology. The type queen was collected at a lit-lamp in a garden. More recently, a colony was found nesting under a log on a raised path in swamp forest.

Remarks. Type locality in Singapore. This species was first described based on a single queen collected in Singapore. The queen can be distinguished from other congeners mainly by its expansive rounded mesosoma (in dorsal view), mesoscutum much wider than long, propodeum very short but wide with no distinction between lateral and posterior margins, both of which form a continuous broadly convex outline in dorsal view. Workers exhibit strong allometric polymorphism, with large majors having massive sub-cordate heads with deeply concave posterior margins, disproportionately small eyes and short antennal scapes; smaller minor workers tend to have smaller and less expanded heads, with antennal scapes exceeding the occipital margin.