On the genus Americanura Cassagnau, 1983 (Collembola: Neanuridae: Sensillanurini) with description of a new Mexican species and complement to the description of A. mexicana Cassagnau, 1983

A new diagnosis of Americanura Cassagnau,1983 is done and a discussion on the genus’ morphology is presented. A new species of the genus, from Chiapas State, Mexico, is described and illustrated; it is characterized by the fusion and reduction of the antenno-frontal tubercle and the highest reduction of its setae. A complement to the description of A. mexicana Cassagnau, 1983 is done including the morphological variation.