Szekessy Vilmos (szerk.): A Magyar Természettudományi Múzeum évkönyve 59. (Budapest 1967)

Pintér, L.: A revision of the genus Carychium O. F. Müller, 1774, in Hungary (Mollusca, Basommatophora)

Table 4 Carychium minimum 0. F. MÜLL. Carychium tridentatum (Risso) Garadna valley Pilismarót Garadna valley Pilismarót Hi 1.90 1.84 2.03 1.79 H

2 0.77 0.76 0.07 0.08 W 0.93 0.92 0.83 0.80 Pi 1.94 2.00 2.45 2.25 P

2 2.46 2.40 3.05 2.71 Actual extreme values P-T 1.72-2.21 1.69-2.10 1.05-2.31 1.58-2.00 H, 0.64-0.90 0.71-0.89 0.52-0.80 0.57-0.77 W 0.80-1.05 0.80-0.98 0.72-0.98 0.73-0.89 Pi 1.88-2.35 1.83-2.20 2.24—2.81 2.09-2.45 P

2 2.12-2.89 2.09-2.72 2.42-3.57 2.33-3.14 IV. Conclusions 1. Actual variation within the two Carychium species is considerably higher than indicated by literature data hitherto. 2. Carychium tridentatum varies within wider limits than C. minimum. 3. No safe identification can be given solely on the basis of measurement ratios, since, according to the two populations, the two ratios overlap one another by 25—38 per cent: 1.83 — 2.35 (C. minimum,) 2.09 — 2.81 (G. tridentatum) P

2 2.09 — 2.89 (C. minimum) 2.33 — 3.57 (C. tridentatum) 4. The variation of the Pilismarót population is narrower than that of the Bükk material: the data of the two species are leveling out, hence a correct identification can hardly be given without recourse to a dissection of the shell. 5. Despite the indicated differences, no varieties in the taxonomic sense can be given, owing to the occurrence of transitions in all materials. Neither are different ecological conditions decisive, since, for instance, the populations deriving from the Mts. Mecsek (limestone) and the Mts. Keszthely (dolomite) gave measurement data nearly identical with those of the Pilismarót population (andésite), besides which the Bükk forms can be found intermixed with the others. Summary The present paper submits a survey of the distribution of two species (Carychium minimum 0. F. MÜLLER, and C. tridentatum Risso) in Hungary, the possibilities of separation and identification, as well as the rate of individual and population variabi-