Fig. 6. Prosthiostomum vulgare Kato, 1938b, ICHUM 6036 (A, C), ICHUM 6154 (B, D, H), ICHUM 6155 (E–G); photographs taken in life (A– D), schematic diagram (E), and photomicrographs of sagittal sections (anterior to the left) (F–H); A, entire body, dorsal view; B, entire body, ventral view; C, magnification of head, dorsal view; D, magnification of head, ventral view, showing ventral eyespots (arrowheads); E, copulatory complex and sucker; F, stylet; G, male copulatory apparatus; H, copulatory complex and sucker. Abbreviations: ce, cerebral eyespots; fg, female gonopore; it, intestine; ma, male atrium; me, marginal eyespots; mg, male gonopore; mo, mouth; ph, pharynx; pv, prostatic vesicle; spv, spermiducal vesicle; st, stylet; su, sucker; sv, seminal vesicle. Scale bars: A, B = 1 mm; C, D = 0.5 mm; E, G, H = 300 µm; F = 100 µm.

Published as part of Tsuyuki, Aoi, Kohtsuka, Hisanori & Kajihara, Hiroshi, 2021, Description of a New Species of the Marine Flatworm Prosthiostomum (Platyhelminthes: Polycladida) and its Three Known Congeners from Misaki, Japan, with Inference of Their Phylogenetic Positions within Prosthiostomidae, pp. 1-20 in Zoological Studies (Zool. Stud.) 60 (29) on page 15, DOI: 10.6620/ZS.2021.60-29, http://zenodo.org/record/12824219