Cytotaxonomy of Parodon nasus and Parodon tortuosus (Pisces, Characiformes): A case of synonymy confirmed by cytogenetic analyses

Genetics and Molecular Biology

Elisangela Bellafronte²  Vladimir Pavan Margarido¹  Orlando Moreira-filho² 

[1],Universidade Federal de São Carlos Departamento de Genética e Evolução São Carlos SP ,Brazil

关键词: cytogenetics;    Parodontidae;    systematics;    18S rDNA;    5S rDNA;   

DOI  :  10.1590/S1415-47572005000500010

来源: SciELO

【 摘 要 】

Morphological and cytogenetical studies were carried out on the freshwater fish Parodon nasus and Parodon tortuosus in order to evaluate a putative synonymy. The diploid chromosome number observed in both species was 2n = 54 (48M/SM and 6ST) with no differences between the sexes. Despite slight differences in the pattern of heterochromatin distribution and the number of cusps in symphysean teeth, the location of nucleolar organizer regions (NORs) and 5S rRNA genes (both species-specific features) were similar in both species. The remarkable similarity observed between these allopatric species supports recent taxonomical reviews indicating that P. tortuosus is a synonym for P. nasus.

【 授权许可】

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