Acanthomyrmex careoscrobis

Nests are found in cavities in dead twigs or rotten wood, under or between stones and in litter on the forest floor. They usually contain tiny fig seeds

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

Biology
Eight colonies contained 22.6±11.1 workers and 1.8±0.9 soldiers. Six colonies contained a single dealate queen, whereas two colonies had a mated ergatoid queen instead. Yamada et al. (2018) found 7-250 fig seeds inside the nests, confirming the prevalence of this specialized diet in the genus.

The holotype was collected from a mixed dipterocarp forest.

Castes
Colonies of A. careoscrobis can produce both winged and ergatoid queens. Ergatoid queens may function as cheaper secondary reproductive females. Both queen types have the same number of ovarioles, however ergatoid queens show variable intermediate external morphology between soldiers and winged queens.

Nomenclature

 *  careoscrobis. Acanthomyrmex careoscrobis Moffett, 1986c: 78, figs. 39A, 40-43 (w.) BORNEO.