Ceratophysella richardi sp. n. (Collembola: Hypogastruridae) from USA, with Synonymization of the Genus Mitchellania with Ceratophysella

Ceratophysella richardi sp. n. is described from South Carolina, USA. Unusual characteristics of a new species (post antennal organ with posterior lobes not surrounding accessory boss, macrochaetae p2 on thoracic terga II-III set nearly in line with setae p1, setae m2 on thoracic tergum II sometimes present, setae p1 and p2 on abdominal tergum IV microchaetae and macrochaetae, respectively, and all body sensilla long) are intermediate between two genera and led the authors to synonymize MitchellaniaWray, 1953 with CeratophysellaBörner, 1932.