Figure 6 in Redescription and three-dimensional reconstruction of the limnic acochlidian gastropod Strubellia paradoxa (Strubell, 1892) (Gastropoda: Euthyneura) from Ambon, Indonesia

Figure 6. Schematic overview of the genital system, male phase. (A) Overview of posterior genital system of paratype, ∗ indicates genital pore, ∗∗ indicates widening in distal bursa stalk, dorsal view; (B) overview of cephalic copulatory apparatus of paratype, dorsal view; (C, D) adapted from Küthe (1935), used with permission: (C) copulatory apparatus with anterior muscle (showing external duct with distal bifurcation and bypass leading into lumen and groove of the stylet) and posterior muscle (with duct passing through the retractor muscle and exiting through a papilla close to a hooked thorn); (D) cross-section of stylet showing lumen and groove. Abbreviations: am, ampulla; bc, bursa copulatrix; bf, basal finger; bp, bypass of paraprostatic duct; bvd, "posterior-leading" vas deferens; dv, diverticle; ed, ejaculatory duct on raised papilla; gd, gonoduct; go, gonad; gr, groove of cuticular stylet; m1, "anterior" muscle, confused with the penis by Küthe; m2, "horseshoe-shaped posterior" muscle; p, penis; pp, paraprostate; ppd, paraprostatic duct; pr, prostate; ps, penial sheath; rm, retractor muscle of copulatory apparatus; rs, receptaculum seminis; sg, external sperm groove on right body side; st, hollow stylet; th, thorn.