Forelius antarcticus

Identification
Worker: Head with convex sides and posterior margin with a wide but relatively shallow concavity mesad. In profile, wide mesopropodeal depression formed by the posterior face of the mesonotum and the anterior propodeal face. Propodeal declivity twice as long as its dorsal face. Dorsum of pronotum with two erect setae, longer and thinner than those found in Forelius heyeri. Concolorous brown ants. (Guerrero, 2021)

Queen: Head rectangular, twice as long as wide (CI ≤ 46). Relatively long antennal scapes, SL > 0.70 mm. Large ants with shorter mesosomas (WL ≤ 1.65 mm) than Forelius pruinosus (WL 1.74) and Forelius mccooki (WL 1.67).

Distribution based on Regional Taxon Lists
Neotropical Region: Chile.

Nomenclature

 *  antarcticum. Tapinoma antarcticum Forel, 1904c: 17 (w.q.) CHILE.
 * Combination in Forelius: Guerrero, 2021: 430.
 * Senior synonym of eidmanni: Menozzi, 1935c: 321; Goetsch & Menozzi, 1935: 98
 * Senior synonym of fazi: Menozzi, 1935c: 321.
 * fazi. Tapinoma fazi Santschi, 1923c: 270 (w.m.) CHILE. Junior synonym of antarcticum: Menozzi, 1935c: 321.
 * eidmanni. Forelius eidmanni Goetsch, 1933: 28, fig. 2 (w.q.) CHILE (attributed to Menozzi). Junior synonym of antarcticum: Menozzi, 1935c: 321; Goetsch & Menozzi, 1935: 98.

References based on Global Ant Biodiversity Informatics

 * Cepeda-Pizarro J., J. Pizarro-Araya, and C. Bravo-Naranjo. 2018. The assemblage of epigean ants (Formicidae) inhabiting altered patches found in a latitudinal transect of coastal matorral of semiarid Chile. IDESIA (Chile) 36(2): 193-201.
 * Emery C. 1906. Studi sulle formiche della fauna neotropica. XXVI. Bullettino della Società Entomologica Italiana 37: 107-194.
 * Goetsch W. and C. Menozzi. 1935. Die Ameisen Chiles. Konowia 14: 94-102
 * Goetsch, W., and C. Menozzi. "Die Ameisen Chiles." Konowia 14 (1935): 94-102.
 * Ipinza-Regla J., L. Castro, R. Eissemann, and M. A. Morales. 2010. Factors Influencing the Distribution of Nests of the Argentine Ant Linepithema humile Mayr (Hymenoptera: Formicidae), in a Foothills Ecosystem of the Central Zone of Chile. Neotropical Entomology 39(5):686-690.
 * Kempf W. W. 1970. Catálogo das formigas do Chile. Papeis Avulsos de Zoologia (São Paulo) 23: 17-43.
 * Kempf, W.W. 1972. Catalago abreviado das formigas da regiao Neotropical (Hym. Formicidae) Studia Entomologica 15(1-4).
 * Menozzi C. 1935. Fauna Chilensis. II. (Nach Sammlungen von W. Goetsch). Le formiche del Cile. Zoologische Jahrbücher. Abteilung für Systematik, Ökologie und Geographie der Tiere. 67: 319-336.
 * Snelling R. R., and J. H. Hunt. 1975. The ants of Chile (Hymenoptera: Formicidae) Revista Chilena de Entomología 9: 63-129.