FIGURE 4. Stylodrilus tofaceus n in New species of aquatic oligochaetes (Annelida: Clitellata) from tufa barriers in Croatia

FIGURE 4. Stylodrilus tofaceus n. sp. (A–H), S. sulci (Hrabě, 1932) (I) and S. lemani (Grube, 1879) (J, K). S. tofaceus n. sp.: A. Ectal ends of ventral chaetae in segments II and III. B. Dorsal chaeta in XI. C. Posterior chaeta. D. Spermathecal pores in IX in the transversal plane of ventral chaetae in IX. E. Male pores in X. F. Ental part of atrial ampulla, covered by small clusters of prostatic cells. G. Atrial duct and penis. H. Spermathecal duct. I. Spermathecal duct in S. sulci (Hrabě), from Hrabě's original series, section on slide, Museum of Natural History of Prague. J, K. Spermathecal duct in S. lemani (Grube), specimens from northern Spain, personal collection of P. Rodriguez. Arrows in H, J and K point to the muscular layer of the spermathecal ducts for comparative purposes.