Stylodrilus coreyi sp. n. A Anterior part of the body, B: simple-pointed chaeta C clitellum D nephridial efferent duct in ventral part of posterior segment (anterior part facing up) E–G consecutive histological sections of male duct H–I details of prostatic glands and connection to atrial ampulla J spermathecal ampulla K spermathecal duct L female funnel. E–L histological sections, other photographs from stained whole mounts or dissected specimens.