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        <dc:title>Karyotypes of two European species of the genus Lymnaea&#13;
with disputable taxonomic status (Gastropoda: Pulmonata: Lymnaeidae)</dc:title>
        <dc:creator>Garbar, А. V.</dc:creator>
        <dc:creator>Kornіushіn, А. V.</dc:creator>
        <dc:subject>QL Zoology</dc:subject>
        <dc:description>Karyotypes of Lymnaea corvus and L. occulta are studied for the first time and&#13;
compared to the original data on Ukrainian populations of L. palustris and L. stagnalis. While&#13;
all the studied species have the same diploid chromosome number (2n = 36), they differ in&#13;
chromosome morphology. Karyotypes of L. occulta and L. palustris include only biarmed&#13;
chromosomes (number of arms = 72). In contrast, L. corvus and L. stagnalis have also&#13;
uniarmed (acrocentric) chromosomes (number of arms = 60 and 62, respectively).&#13;
Karyological data confirm specific distinctness of L. occulta and L. corvus; however, similarity&#13;
in the chromosome morphology of the latter species to L. stagnalis is probably based on&#13;
symplesiomorphies and, thus, cannot support phylogenetic relationship suggested earlier&#13;
on the basis of anatomical characters.&#13;
Kurzfassung. Karyotypen von zwei europдischen Arten der Gattung Lymnaea mit&#13;
umstrittenem taxonomischen Status (Gastropoda: Pulmonata: Lymnaeidae). -&#13;
Karyotypen von Lymnaea corvus und L. occulta wurden erstmalig untersucht und mit den&#13;
originalen Daten fьr ukrainische Populationen von L. stagnalis und L. palustris verglichen.&#13;
Alle untersuchten vier Arten weisen dieselbe Anzahl diploider Chromosomen auf (2n =&#13;
36), kцnnen aber durch die Morphologie der Chromosomen unterschieden werden. Die&#13;
Karyotypen von L. occulta enthalten nur zweiarmige Chromosomen (Anzahl der Arme =&#13;
72). Im Gegensatz hierzu weisen L. corvus und L. stagnalis auch einarmige (akrozentrische)&#13;
Chromosomen auf (Anzahl der Arme = 60 beziehungsweise 62). Die karyologischen&#13;
Befunde bestдtigen die spezifische Verschiedenheit von L. occulta und L. corvus; jedoch ist&#13;
die Дhnlichkeit in der Chromosomenmorphologie der letzteren Art gegenьber L. stagnalis&#13;
wahrscheinlich auf Symplesiomorphien zurьckzufьhren, deshalb kann die frьher auf der&#13;
Basis anatomischer Merkmale behauptete phylogenetische Verwandtschaft von L. corvus&#13;
und L. stagnalis nicht unterstьtzt werden.</dc:description>
        <dc:date>2002</dc:date>
        <dc:type>Article</dc:type>
        <dc:type>PeerReviewed</dc:type>
        <dc:format>text</dc:format>
        <dc:language>uk</dc:language>
        <dc:identifier>http://eprints.zu.edu.ua/9688/3/Karyotypes%20Stagnicola.pdf</dc:identifier>
        <dc:identifier>  Garbar, А. V. and Kornіushіn, А. V.  (2002) Karyotypes of two European species of the genus Lymnaea with disputable taxonomic status (Gastropoda: Pulmonata: Lymnaeidae).  MALAKOLOGISCHE ABHANDLUNGEN, 20 (24).       </dc:identifier>
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