Choeradoplana albonigra (Riester, 1938) A diagrammatic transverse section of a portion, seemingly near the anterior extremity, of holotype. Photomicrographs of transverse sections (B–F) B dorsal epidermis in pre-pharyngeal region of specimen F4024 C ventral epidermis in pre-pharyngeal region of specimen F4024 D–F cephalic region of specimen F4081 at 1.2, 0.4, and 0.15 millimeters from anterior extremity of the body, respectively. Scale bar: 200 µm. Abbreviations: cm common muscle coat, co common glandular ovovitelline duct, dd decussate dorsal cutaneous muscles, dm diagonal decussate muscles, e eye, ej ejaculatory duct, ep esophagus, er erythrophil secretion, fa female atrium, fd female genital duct, g gonopore, i intestine, lc longitudinal cutaneous muscles, ma male genital atrium, mk Muskelgeflecht (Graff, 1899), mo mouth, o ovary, ov ovovitelline duct, ph pharyngeal pouch, pp penis papilla, pv prostatic vesicle, px pharynx, rg rhabditogen glands, r retractor muscle, sb subintestinal transverse muscles, sd sperm duct, sg shell glands, sk sunken longitudinal cutaneous muscles, sm spermatophore, sn subneural transverse muscles, sp supra-intestinal transverse muscles, t testis, vi vitellaria, vn ventral nerve plate.