Forelius heyeri

Identification
Posterior cephalic margin completely straight. Mandible with five teeth and one denticle. Scape much shorter (≤ 0.43 mm) than that of Forelius antarcticus (SL ≥ 0.69 mm), below or barely reaching the posterior cephalic margin by a length less than the width of the pedicel. Pronotum with two thick dark erect setae that contrast with the light integument, each seta arising from a distinct fovea. (Guerrero, 2021)

Distribution based on Regional Taxon Lists
Neotropical Region: Argentina, Paraguay, Uruguay.

Nomenclature

 *  heyeri. Tapinoma heyeri Forel, 1902e: 296 (footnote), pl. 1, fig. 11 (w.) BRAZIL.
 * pusillus. Forelius breviscapus var. pusillus Santschi, 1922b: 374 (w.) ARGENTINA.
 * Raised to species and senior synonym of tucumanus: Cuezzo, 2000: 263.
 * Junior synonym of heyeri: Guerrero, 2021: 433.
 * risii. Tapinoma heyeri var. risii Forel, 1912h: 58 (w.) URUGUAY.
 * Junior synonym of heyeri: Guerrero, 2021: 433.
 * tucumanus. Neoforelius tucumanus Kusnezov, 1953b: 330, figs. 1-12 (w.q.m.) ARGENTINA.
 * Combination in Forelius: Shattuck, 1992c: 95.
 * Junior synonym of pusillus: Cuezzo, 2000: 263.
 * Junior synonym of heyeri: Guerrero, 2021: 433.

References based on Global Ant Biodiversity Informatics

 * Fernández, F. and S. Sendoya. 2004. Lista de las hormigas neotropicales. Biota Colombiana Volume 5, Number 1.
 * Kempf, W.W. 1972. Catalago abreviado das formigas da regiao Neotropical (Hym. Formicidae) Studia Entomologica 15(1-4).