Review of Paracerella Imadate (Protura: Acerentomidae, Nipponentominae) with identification key and description of a new species

Paracerella americana Imadate is redescribed based on the type material. The original description is corrected and supplemented with new characters, including head chaetotaxy, seta length, porotaxy and shape of the male squama genitalis. Paracerella monterey sp. nov. is described from specimens that were originally part of the "Paracerella americana type series". Paracerella americana is characterized by presence of seta P1a on tergites I-VI and absence of seta on tergite VII, presence of 4 P-setae on sternite I, and concave hind margin of the comb on tergite VIII. Paracerella monterey sp. nov. is characterized by absence of seta P1a on tergites I-VII, presence of 2 P-setae on sternite I, and straight hind margin of the comb. A key to Paracerella species is provided.