Folia Historico-Naturalia Musei Matraensis - A Mátra Múzeum Természetrajzi Közleményei 6. (1980)

Varga, A.: Egy új Cochlostoina alfaj Jugoszláviából

Fol. Hist.-nat. Mus. Matr. 6. 1980. A NEW SUBSPECIES OF COCHLOSTOMA FROM YUGOSLAVIA (MOLLUSCA, CYCLOPHORIDAE) VARGA András Mátra Múzeum, Gyöngyös ABSTRACT: Description of a new subspecies of Cochlostoma septemspirale riedeli from Montenegro. This subspecies is distinguished from Cochlostoma septemspirale (RAZUMOWSKI) in rass-group by its small body size and its slender shape of shell. With 12 figures. COCHLOSTOMA (COCHLOSTOMA) SEPTEMSPIRALE RIEDELI ssp. n. (Figures 1—3) Description : Shell slender, thin-walled, pinnacle-formed, apex pointed, with 9—9.8 smoothly increasing whorls separated by deep suture. Basic part rather narrow and low. Last half whorl smoothly expanding towards mouth, slightly expanded behind. Mouth rounded, vault slightly scalloped, slantwise cut near umbilicus. Peristoma narrow, simple or slightly doubled. Mouth-edge thin, slightly pulled froward above. Wall of mouth slightly thickened from centre of whorl to suture, giving the upper corner of mouth a puffed form in profile (Figure 2). Umbilicus open, well-perceptible. Colour of shell pallid horny brown, of darker shade at apex, embryonary shell yellowish. Last whorl along suture square in centre, decorated with a faint red-brown row of spots. Behind mouth, spots, increasing in size, nearing mouth-edge. Band round umbilicus red-brown, faint in some places. Sculpture slightly diagonal and curved. Ribs pointless settling symmetrically. Width and height of ribs nearly the same along beginning of last whorl. Height of ribs increasing slightly perceptibly toward apex. Embryonary shell flat. Ribs along last half whorl condensed, thinned, settled asymmetrically, levelling out and disappear, nearing mouth-edge. Operculum thin, slightly concave, with whorled outlines, of yellowish horn-colour. Measurement of holotype — in the case of 9.22 whorls — (in mm): Height, 6.30; breadth, 2.80; height of mouth, 1.86; breadth of mouth, 1.81. Locus typicus: Yugoslavia, Montenegro, 20 kms from Ribarice, toward Rozaj, rocks along road. Leg. L. PINTÉR, P. SUBÁI, A. SZIGETHY, 21 July, 1972. Materials : Holotype and 50 paratypes in the Mollusca collection of the Hungarian Natural History Museum, Budapest; 50 paratypes in the collection of L. PINTÉR in Budapest; 5 paratypes in the Mátra Múzeum at Gyöngyös; 48 paratypes in the collection of P. SUBAI in Hannover. The new subspecies is dedicated to Prof. Dr. ADOLF RIEDEL (Warsaw), who contributed greatly to the knowledge of Cochlostoma species. 185