Acromyrmex crassispinus

Distribution
This taxon was described from Paraguay. It is also found in Argentina and Brazil.

Nomenclature

 *  crassispinus. Atta (Acromyrmex) mesonotalis var. crassispina Forel, 1909a: 257 (w.) PARAGUAY. Santschi, 1925a: 374 (q.). Combination in Acromyrmex: Emery, 1924d: 349. Subspecies of mesonotalis: Forel, 1914e: 11. Raised to species: Santschi, 1925a: 374. Senior synonym of: atratus, diabolica, insularis, mediocris, rusticus and material of the unavailable name rufescens referred here: Gonçalves, 1961: 139.
 * diabolica. Acromyrmex nigrosetosa var. diabolica Santschi, 1922b: 362 (w.) BRAZIL. Santschi, 1925d: 240 (m.). Subspecies of crassispinus: Santschi, 1925a: 375. Raised to species: Santschi, 1925d: 240. Junior synonym of crassispinus: Gonçalves, 1961: 139.
 * atratus. Acromyrmex hispidus st. atratus Santschi, 1925a: 376 (w.q.) ARGENTINA. Junior synonym of crassispinus: Gonçalves, 1961: 139.
 * insularis. Acromyrmex aspersus var. insularis Santschi, 1925d: 242 (w.) BRAZIL. Junior synonym of crassispinus: Gonçalves, 1961: 139.
 * mediocris. Acromyrmex diabolicus var. mediocris Santschi, 1925d: 241 (w.) BRAZIL. Junior synonym of crassispinus: Gonçalves, 1961: 139.
 * rusticus. Acromyrmex crassispinus st. rusticus Santschi, 1925a: 375 (w.q.) BRAZIL. Junior synonym of crassispinus: Gonçalves, 1961: 139.