Host Specificity and Range Extension of Anaclasiger sinuaticollis Raffray, 1890 (Coleoptera: Staphylinidae: Pselaphinae)

Anaclasiger sinuaticollis Raffray, 1890 (Staphylinidae: Pselaphinae: Clavigeritae) is newly recorded from the Chinese mainland (Shandong Province), representing a significant northern expansion of its known range. Notably, the host association of this species is reported for the first time, 136 years following its discovery. The diagnosis of the species is updated and a discussion on the intraspecific variation is provided.