Dr. Éva Murai szerk.: Miscellanea Zoologica Hungarica 2. 1984 (Budapest, 1984)

Varga, A.: The Cochlostoma genus (Gastropoda, Prosobranchiata) in Yugoslavia. I. Anatomical studies

Velebit specimen (Fig. 62): Seminal receptacle 1. 5 times length of SBC apart. Seminal receptacle a weakly inflated section of oviduct, therefore not easily recognizable. Bursa copulatrix differing from that of above specimen, stipes longer and sac larger. Uterus gland smaller. Male reproductive system (Figs 63-67). Sperm duct opening into prostrate on lateral side. Prostrate falling into two parts, tapered apical part followed by a stronger section and elongated terminal part, after opening into mantle cavity at posterior end. Prostrate and penis connected by a thin tube. Penis short, apical part tapering. Length-width ratios 6.6:1 and 4.6:1 (Plitvice specimens. Figs 64-65), and 5.2:1 and 5.5:1 (Velebit specimens. Figs 66-67). Cochlostoma gracile sturanyi (A.J. WagnerT897) Material: Hrvatska, Bihac, ruins of a medieval castle out side the town, 700 m, coll. A. Wiktor, 22. 5. 1982 (Fig. 68). Only a single male specimen was examined (Fig. 68). Cochlostoma nanum nanum (Westerlund 1879) Material: I. Hrvatska, Velebit Mts, above Sveti Rok, northeastern slopes of Voganski Vrh, 1000 m, on rocks, Ca, coll. A. Wiktor, 29.5.1982 (Figs 69-71). - II. Same locality, beechwood above 1000 m, Ca, coll. A. Wiktor, 29. 5. 1982 (Figs 72-76). The colour difference between the sexes is obvious if living specimens or shells preserved in alcohol are examined. Shell of females uniformly bright. Embryonic shells of males brownish, subsequent four whorls bluish black, very different from last whorls. A general conclusion is that the abovementioned sexual difference exists if the shell is whitish or ashen grey. Conversely, no difference may be observed among specimens with brown shells. Tentacles and proboscidium unexpectedly short in both sexes. Two populations, found at the same locality but in different habitats, were examined. The first population is characterized by a blunt or little pointed tip of penis. In the other population the penis is tapered, its base is wide and apex pointed. Similar morphological differences among male reproductive systems at the population level were also observed in the case of other species. These minor but stabilized differences may provide data to the microevolution of the otherwise very flexible Cochlostoma genus. However, the few observations may yield only unreliable basis for general conclusions. Female reproductive system (Fig. 69). Oviduct thin and undulate. SBC short, joining oviduct below apex .of uterus gland. Apical part of seminal receptacle sharply distinct from oviduct. Separation diminishing towards uterus gland since seminal receptacle becoming gradually narrower. Yet, its narrowest section is twice as wide as the upper tract of oviduct. SBC funnel-shaped. Sac falling into sections a and B with their ratio being about 1:1. Uterus gland strongly developed, opening into mantle cavity at rectum. Male reproductive system (Figs 70-76). Prostrate falling into two parts, which considering body size of animal is relatively small. Prostrate narrowly opening into mantle cavity at rectum, opening slightly shifted towards posterior end. Prostrate and penis connected via a short tube. Penis shape as described above. Vas deferens strongly undulate inside penis. Length-width ratio 4:1 (Fig. 70) and 4.9:1, 5:1, 4.3:1, 4.3:1 (Figs 72-75). Thickened apertural lip shown in Fig. 76 is typical, this specimen is a micropenis form. Cochlostoma auritum auritum (Rossmàssler 1837) Material: I. Montenegro, Kotor, castle, coll. L. Pintér, P. Subai, and A. Szigethy. 24.7. 1972 (Fig. 77). - II. Same locality, above the town, 50-450 m, in the ruins and on the rocks, limestone, coll. A. Wiktor, 1.11.1982 (Figs 78-81). - III. Titograd, at the highest point along the road between Titograd and Rijeka Cmojevica, 3 kms from Barutan towards Rijeka Crnojevica, coll. L. Pintér, P. Subai and A. Szigethy. 20.7.1972 (Figs 82-84). Female reproductive system (Fig. 77). Oviduct thin and undulate. SBC joining oviduct close to tip of uterus gland. Seminal receptacle positioned from this point at a distance about same as SBC length. Apical point of seminal receptacle clearly separated, but its distinction towards the uterus less obvious. Sac of bursa copulatrix approximately mushroom-shaped