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Karyological Features of the Genus Planorbarius (Gastropoda, Pulmonata, Bulinidae) of the Ukranian Fauna

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  • Ql Zoology

Abstract

ISSN 0095-4527, Cytology and Genetics, 2007, Vol. 41, No. 2, pp. 109–114. © Allerton Press, Inc., 2007. Original Russian Text © D.A. Garbar, A.V. Garbar, 2007, published in Tsitologiya i Genetika, 2007, Vol. 41, No. 2, pp. 49–55. 109 INTRODUCTION The first karyological investigations of the genus Planorbarius were performed in the middle of the 20th century. However, the results were rather contra- dictory. For example, for P. corneus (Linné, 1758), dif- ferent numbers of chromosomes in the diploid set were reported: 2 n = 36 [1, 2] and 2 n = 34 [3]. Botke [4] investigated the chromosomal set of this species in more detail. According to his data, the kary- otype of P. corneus consists of 36 monocentric chromo- somes, which gradually decrease in size, with a median or submedian location of the centromere. The limited amount of the investigated material (7 metaphase plates with a high degree of chromosome spiralization) did not permit a more comprehensive description of the karyotype of this species. Note that in all the listed papers, the species P. corneus was taken in the broad sense (as a single representative of the genus), and most modern malacologists hold these viewpoints [5–10]. However, some researchers, primarily Russians, are inclined to assign species status to numerous morpho- logical forms. They distinguish from five to eight sym- patric species [11–13] within the genus Planorbarius . For example, for the Ukrainian fauna Stadnichenko [14] distinguishes five species: P. corneus (Linné, 1758), P. banaticus (Lang, 1856), P. purpura (O.F. Müller, 1774), P. grandis (Dunker, 1856), and P. stenostoma (Bourguignat in Servain, 1881). Maksi- mova attempted to study the karyological features of the species of the genus Planorbarius in the narrow sense [12]. She investigated the chromosomal sets of fou

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