The chromosome complement and the nuclear DNA content in two caenogastropod species from the Mediterranean Sea, Crepidula unguiformis (Calyptraeidae) and Naticarius stercusmuscarum (Naticidae), were investigated by the application of both classical and molecular cytogenetic methods. Despite the constancy of haploid chromosome numbers (n = 17 in both species), C. unguiformis and N. stercusmuscarum show genome sizes amounting to 6.36 and 2.63 pg, respectively. Moreover, while N. stercusmuscarum resembles cytogenetically the other neotaenioglossan caenogastropods studied so far, C. unguiformis differs in: (i) number and location of rDNA clusters (ii), composition of telomeric repeats, and (iii) genome size, thus suggesting a peculiar karyotypical evolution undergone by this species.
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1 March 2009
Karyotypes, Banding Patterns and Nuclear DNA Content in Crepidula unguiformis Lamarck, 1822, and Naticarius stercusmuscarum (Gmelin, 1791) (Mollusca, Caenogastropoda)
Angelo Libertini,
Roberto Vitturi,
Armando Gregorini,
Mariastella Colomba
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Malacologia
Vol. 51 • No. 1
March 2009
Vol. 51 • No. 1
March 2009
banding techniques
Caenogastropoda
chromosomes
Fish
genome size
Mollusca
telomeres