Amphiporus nigrostriatus, Timofeev, 1911

Kajihara, Hiroshi, 2025, A taxonomic revision of the freshwater monostiliferous hoplonemertean genus Prostoma Dugès, 1828 (Nemertea: Eumonostilifera): a radical solution or an over-lumping?, Zootaxa 5646 (4), pp. 451-500 : 486

2. Amphiporus nigrostriatus

(Annex Fig. 1B )

Description. Small nemertean up to 10 mm long; gray or grayish brown in colour, with large brown spot on head and pronounced dark-brown stripe on dorsal surface of body.

Locality. Sublittoral, silt, together with Cephalotnrix from ca. 16–18 m depth (Annex Fig. 2 , III, dredging number 44). Two specimens were found, both males.

Remarks. The original figure (рис. 2) shows two accessory stylet pouches, each containing two to three accessory stylets.

Figures

FIGURE 1. Maps showing the three sampling points C1, C4, and D2 in Inoue et al. (2012) in Nanko, the southern part of Lake Biwa; white arrowheads indicate the approximate positions of the localities from where Prostoma ohmiense Chernyshev et al., 1998 was described (the holotype locality is the northern one).

FIGURE 2. Prostoma clepsinoides Dugès, 1828 from Lake Biwa, Japan. A, Entire specimen in living state, lost after photographed. B, C, Transverse sections through proboscis anterior chamber; white arrowheads pointing to proboscis nerves. D, Sagittal section through the opening of the oesophagus–rhynchodaeum complex; black arrowheads pointing to cilia on ventral wall of oesophagus; anterior to the left. E, Magnification of D, showing sparse cilia on ventral wall of oesophagus, indicated by black arrowheads. F, Magnification of D; black arrowhead pointing to longitudinal muscle fibre along rhynchodaeum.G, Sagittal section near rhynchodaeal opening; anterior to the right. B, D, E, F, ICHUM 6272; C, ICHUM 6277; G, ICHUM 6273.