FIGURE 6 in Revealing the stygobiont and crenobiont Mollusca biodiversity hotspot in the Caucasus: Part III. Revision of stygobiont microsnails (Mollusca: Gastropoda: Hydrobiidae) from the Russian part of Western Transcaucasia, with the description of new taxa

FIGURE 6. Schapsugia pulcherrima (A–J) and Tachira valvataeformis (K–R). A, B, K, L—shell; C, M—operculum: inner and outer sides; E, O—radulae; F–H, P—penis structure; D, N—protoconch, lateral view; J, Q—protoconch surface sculpture; I, R—protoconch, apical view. F, G correspond to individuals identified as 'Paladilhiopsis orientalis', H—'P. pulcherrima'. White arrow points to the fin-like edging of the penis. Scale bars: A, B, J, K—500 μm; R—200 μm; F, G, H, K, L—250 μm; C, D, I, M, N—100 μm; E, J, Q—20 μm; O—10 μm.