Allochthonius (U.) yoshizawai sp. nov., male holotype. A Male genital operculum B holotype carapace, showing distribution of setae (most hairs missing) C male genital operculum D coxal blades on coxae I, ventral view. Scales: 0.25 mm (A); 0.5 mm (B); 0.1 mm (C, D).