Crematogaster atra

Identification
Longino (2003) - A Crematogaster crinosa-complex species, C. atra requires further taxonomic study. The Norton type series, from which the lectotype is chosen, has the general shape and pilosity characters of Crematogaster crinosa, the only difference being that the face is completely covered with fine, dense striae, with no smooth or shiny areas.

Distribution based on Regional Taxon Lists
Neotropical Region: Argentina, Brazil, Mexico, Venezuela.

Nomenclature

 * . Crematogaster atra Mayr, 1870b: 994 (w.) MEXICO (no state data).
 * Type-material: lectotype worker (by designation of Longino, 2003a: 129), 1 paralectotype worker.
 * Type-locality: lectotype Mexico: (no further data) (Norton); paralectotype Mexico: (no further data) (Bilimek).
 * Type-depository: NHMW.
 * Combination in C. (Orthocrema): Emery, 1922e: 134.
 * Status as species: Emery, 1888c: 356; André, 1893b: 152; Dalla Torre, 1893: 79; von Jhering, 1894: 394; Forel, 1899c: 81; Emery, 1922e: 134; Borgmeier, 1927c: 92; Wheeler, W.M. 1942: 193; Kempf, 1972a: 84; Bolton, 1995b: 148; Longino, 2003a: 129; Morgan & Mackay, 2017: 85 (redescription).
 * Distribution: Argentina, Bolivia, Brazil, Colombia, Mexico, Paraguay, Uruguay, Venezuela.

Description
Longino (2003) - Syntype worker: Mexico (Norton, Bilimek) (examined, Norton worker here designated LECTOTYPE). The syntypes of atra have no more precise locality data than “Mexico,” but are by two different collectors, Bilimek and Norton.

References based on Global Ant Biodiversity Informatics

 * Kempf, W.W. 1972. Catalago abreviado das formigas da regiao Neotropical (Hym. Formicidae) Studia Entomologica 15(1-4).
 * Morgan, C.E. 2009. Revision of the ant genus Crematogaster (Hymenoptera: Formicidae) in North America. Ph.D. Dissertation, University of Texas at El Paso, 268 pp.
 * Vasquez-Bolanos M. 2011. Checklist of the ants (Hymenoptera: Formicidae) from Mexico. Dugesiana 18(1): 95-133.
 * Vásquez-Bolaños M. 2011. Lista de especies de hormigas (Hymenoptera: Formicidae) para México. Dugesiana 18: 95-133