FIGURE 8 in Hemipenial morphology in the North American snake genus Phyllorhynchus (Serpentes: Colubridae), with a review of and comparisons with natricid hemipenes

FIGURE 8. Details of apical morphology of Rhabdophis and Xenochrophis hemipenes. A, Rhabdophis nuchalis (CAS 242054), crotch and medial surface of the right lobe showing broad sulcus groove within a nude expanse. B, Rhabdophis subminiatus (CAS 206565), tip of the right lobe showing divergence of the sulcus lips to form a small nude area. C, Xenochrophis cerasogaster (CAS 245195), left lobe, sulcate surface showing expansion of the sulcus spermaticus to form a nude surface. D, Xenochrophis piscator (CAS 208428), sulcate surface of the right lobe showing divergence of the sulcus lips to form a nude strip covering virtually the entire sulcate surface of the narrow part ("nipple") of the lobe (the nipple is somewhat twisted). Arrow indicates the point at which the sulcus lips diverge.