Crematogaster ampla

In somes areas of Brazil C. ampla is parasitized by the xenobiont, which is able to find and exploit foraging trails of C. ampla.

Identification
Longino (2003) - A Crematogaster crinosa-complex species. Crematogaster ampla has a distinctive character that distinguishes it from all other Crematogaster. The fourth abdominal tergite has a subtriangular impression posterior to the postpetiolar insertion. This impression is completely smooth and shining, contrasting with the surrounding granular microsculpture. On some small workers the fourth abdominal tergite is completely smooth and shining, but the triangular impression is still distinct. In all other Crematogaster there may be an impression anterior to the postpetiole, but not posterior to it. Other characters are similar to crinosa, including a long, acute, anteroventral petiolar tooth, abundant setae on the fourth abdominal tergite, dorsal and posterior faces of propodeum meeting at an angle, and a strongly arched promesonotum. Unlike other crinosa complex species, the scapes and tibiae sometimes have one or two erect setae, especially on large workers.

Distribution based on Regional Taxon Lists
Neotropical Region: Bolivia, Brazil, Colombia, Mexico, Panama, Paraguay.

Biology
Koch et al. (2018) sampled this species in Caryocar barsiliense trees, in southeastern Brazil cerrado, as part of a study examining species interactions in ant-plants.

Nomenclature

 * . Crematogaster brevispinosa var. ampla Forel, 1912f: 211 (w.) COLOMBIA.
 * Type-material: lectotype worker (by designation of Longino, 2003a: 128).
 * Type-locality: lectotype Colombia: Santa Cruz, nr Santa Marta (A. Forel); paralectotype workers (number not stated).
 * [Note: other original syntypes from type-locality, plus syntypes from Colombia: Santa Marta (A. Forel), Colombia: Barranquilla (A. Forel).]
 * Type-depository: MHNG.
 * Combination in C. (Orthocrema): Emery, 1922e: 134.
 * Subspecies of brevispinosa: Emery, 1922e: 134; Borgmeier, 1927c: 92; Wheeler, W.M. 1942: 194; Kempf, 1972a: 85; Bolton, 1995b: 147.
 * Status as species: Longino, 2003a: 128; Wild, 2007b: 32; Pedraza & Fernández, 2019: 895.
 * Distribution: Bolivia, Colombia, Paraguay.

Type Material
Longino (2003) - Syntype workers: Colombia, Magdalena, Santa Cruz near Santa Marta (Forel) (examined, worker here designated LECTOTYPE).

The syntypes at MHNG were a combination of Crematogaster ampla and Crematogaster crinosa, necessitating designation of a lectotype.

References based on Global Ant Biodiversity Informatics

 * Armbrecht I., I. Tischer, and P. Chacon. 2001. Nested subsets and partition patterns in ant assemblages (Hymenoptera, Formicidae) of Colombian dry forest fragments. Pan-Pacific Entomologist 77(3): 196-209.
 * Chacon de Ulloa P., A. M. Osorio-Garica, R. Achury, and C. Bermudez-Rivas. 2012. Hormigas (Hymenoptera: Formicidae) del Bosque seco tropical (Bs-T) de la cuenca alta del rio Cauca, Colombia. Biota Colombiana 13(2): 165-181.
 * 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).
 * Longino, J.T. 2003. The Crematogaster (Hymenoptera, Formicidae, Myrmicinae) of Costa Rica. Zootaxa 151:1-150
 * Ulyssea M. A., and C. R. F. Brandao. 2013. Ant species (Hymenoptera, Formicidae) from the seasonally dry tropical forest of northeastern Brazil: a compilation from field surveys in Bahia and literature records. Revista Brasileira de Entomologia 57(2): 217224.
 * Ulysséa M. A., C. R. F. Brandão. 2013. Ant species (Hymenoptera, Formicidae) from the seasonally dry tropical forest of northeastern Brazil: a compilation from field surveys in Bahia and literature records. Revista Brasileira de Entomologia 57(2): 217-224.
 * 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
 * Wheeler W. M. 1942. Studies of Neotropical ant-plants and their ants. Bulletin of the Museum of Comparative Zoology 90: 1-262.