FIGURE 4 in New Eclipidrilus species (Annelida, Clitellata, Lumbriculidae) from southeastern North America

FIGURE 4. Eclipidrilus microthecus (G, specimen from Pettiford Creek, whole mount; all others from tributary to Naked Creek, A from a whole mount, others from sections). A–C, ectal part of spermathecal duct and vestibule: B shows the outer vestibule; C shows the ental part of the vestibule, with muscular ring. D, spermatheca. E, atrial duct and base of ampulla. F, sagittal section of atrial ampulla, with ental end and "prostate" to the right. G, atrial ampulla as seen in whole mount. H, transverse section of atrial ampulla, showing muscle layers and narrow lumen. I, ectal end of atrial duct and penial structure with (faint) penis. Scale bars: 100 μm.