FIGURE 5. A–B in A new species of Gerstfeldtiancylus Starobogatov, 1989 (Pulmonata: Basommatophora: Acroloxidae) from Lake Baikal

FIGURE 5. A–B. Anatomy of Gerstfeldtiancylus ushunensis, sp. nov.. А. General topography of main organs of the alimentary system, dorsal view. Digestive gland removed. B. Dorsal view of specimen without shell. C–D. Odontophore of G. ushunensis, sp. nov.. E–L. Jaws of different Gerstfeldtiancylus species. E–H. G. ushunensis, sp. nov. (A, C–E. ZIN RAS 1/521–2006. B, F–H. ZIN RAS 2/521–2006). I. G. renardii (Dybowski, 1884). J. G. roepstorfi Shirokaya et al., 2003. K. G. benedictiae Starobogatov, 1989 (whole mounts in Faure-Berlezet liquid). L. G. kotyensis Starobogatov, 1989 (frontal histological section). I–L. From Shirokaya & Röpstorf (2004). aal, left anterior adductor; aar, right anterior adductor; ap, anal pore; bm, buccal mass; cae, caecum; dgp, digestive gland pores; int1, first intestinal loop; int2, second intestinal loop; mb, mantle border; oa, original or posterior adductor; oe, oesophagus; rs, radular sac; sg, salivary glands; st, stomach. Scale bars: A–D = 1 mm; E = 0.8 mm; F–H, J = 0.5 mm; I, K–L = 0.3 mm.