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Wiley InterScience | ||||||||
  HereditasVolume 134 Issue 3, Pages 201 - 210 Published Online: 22 Apr 2004 Journal compilation © 2009 Hereditas
Abstract | References | Full Text: PDF (Size: 830K) | Related Articles | Citation Tracking  Trends in the Karyotype Evolution of Loricariidae Fish (Siluriformes) ABSTRACTSix species of Loricariidae belonging to the subfamilies Hypostominae (Hypostomus emarginatus, Rhinelepsis aspera, Poganopoma wertheimeri), Ancistrinae (Panaque cf. nigrolineatus, Hemiancistrus sp.) and Loricariinae (Sturisoma cf. nigrirostrum) were studied cytogenetically. The results show that 2n = 54 represents the basal diploid number for this fish family. Different trends in the karyotypic evolution can be seen among the subfamilies: Hypostominae and Loricariinae species present diversified karyotypic macrostructures, while the Ancistrinae appear to show more conserved karyotypes. Among the Hypostominae, the genus Hypostomus had a wide karyotypic variation (2n = 52 to SO), where centric fissions seem to play an important role in this chromosomal divergence. The nucleolar organizing regions were diversified, and occurrence of multiple NORs was frequent. Heteromorphic chromosomes belonging to distinct sex chromosome systems can also occur infrequently among the Loricariidae. Received March 7, 2001 Accepted August 26, 2001 | 
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