Dark Guest Ant

Tetramorium atratulum is a rare workerless socially parasitic ant from the Palaearctic region, which has even been introduced together with its host in North America. This extreme inquiline is represented only by female and pupoid type male individuals, whose morphology and anatomy indicate a highly specialized level of parasitism. The body of males is depigmentated, the cuticle is thin, the petiole and postpetiole are widely connected, and degenerate mandibles, palps, and antennae are observed.

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Anergates es un género de hormigas de la tribu Crematogastrini, incluida en la subfamilia Myrmicinae. El género incluye una única especie, Anergates atratulus (descrita por Schenk en 1852), que carece de obreras (la palabra "Anergates" significa literalmente "sin obreras"), por lo que actúa como parásito de otra especie de hormigas, Tetramorium caespitum, vulgarmente llamada hormiga de pavimento. Algunos taxónomos la llaman Tetramorium atratulum.