Multiple sex-chromosome system and other karyological characterizations of Pterotrachea hippocampus (Mollusca: Mesogastropoda) |
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| Authors: | R Vitturi E Catalano D Colombera A L Avila A Fucà |
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| Institution: | (1) Institute of Zoology  Giuseppe Reverberi , University of Palermo, Via Archirafi 18, I-90123 Palermo, Italy;(2) Department of Biology, University of Padua, Via Trieste 75, I-35121 Padua, Italy |
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| Abstract: | Two modal diploid numbers of chromosomes were found for Pterotraches hippocampus Philippi (Mollusca: Mesogastropoda) collected from the Gulf of Palermo in 1990: 2n=31 and 32 for males and females, respectively. This, along with other karyological characteristics such as the occurrence of a trivalent configuration at diakinesis and two types of metaphase-II spreads in spermatocytes, supports the notion that a X1X2Y /X1X1X2X2 sex mechanism operates in the species investigated here. Silver nitrate procedure revealed an intraindividual variation in the Ag-staining pattern occurring in this species. The majority of the chromosome pair displayed terminal and/or interstitial heterochromatic blocks after C-banding. |
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