Figs 39-42. Various arrangements of male and prostatic pores and associated structures in megascolecid earthworms.
Fig. 39: Prostatic pores on 19, in position of chaeta b on small rounded papillae. Seminal groove runs forward from each prostatic pore to the male pore which is on a small flattish papilla, near the posterior margin of 18. The species illustrated is Sylvodrilus gravus; this is the only New Zealand species with prostatic pores only on 19. Fig. 40: One pair of combined male and prostatic pores, on 18, one on each side of a narrow median ventral depression which extends from the anterior edge of 17 to the posterior edge of 19. The species illustrated is Megascolex animae. Fig. 41: One pair of combined male and prostatic pores, on 18. one on each side of a small median ventral depression; each pore situated on a small round papilla, about in line with chaeta a. The species illustrated is Spenceriella pallida. Fig. 42: One pair of combined male and prostatic pores, on 18, one at each end of a prominent, transverse, ‘dumbbell’-shaped ridge, the pores in line with chaeta b. A number of small tubercula pubertatis surround the ridge bearing the pores. The species illustrated is Diporochaeta obtusa.
Figs. 43-46. Various arrangements of spermathecal pores.
Fig. 43: Pores in intersegmental furrows. Fig. 44: Pores at anterior margins of segments. Fig. 45: Pores at posterior margins of segments. Fig. 46: Pores between chaeta a and b.
Figs. 47, 48. Arrangements of nephridiopores.
Fig. 47: In a single series along the side of the body (in this case, lateral, in line with chaeta c). Fig. 48: Alternating between lateral and ventro-lateral positions in successive segments.