Abstract
A new species Perisphaerus horaianus sp. nov. is described based on specimens collected from Japan and Taiwan. Females of this species are distinguished from similar species primarily by the following diagnostic characters: 1) the anterior surface of the head generally unicolor, dark reddish brown in upper half and darkening to black in lower half; 2) interocular distance approximately half the distance between antennal sockets; 3) basal half to two-thirds of the coxal grooves on mid- and hind coxae black, distal portion light brown; and 4) abdominal pit formula 0-3-3-3-3. Phylogenetic analyses using Maximum Likelihood and Bayesian methods from datasets concatenated from two mitochondrial markers (COX1 and COX2) strongly supported the monophyly of P. horaianus sp. nov., which has a 10.9%–13.2% (K2P) COX1 divergence from P. pygmaeus. Additionally, the female of P. pygmaeus is redescribed, and the female syntype is designated as the lectotype of the species.
https://ror.org/05vn3ca78 
