Molecular and Chromosomal Markers for Evolutionary Considerations in Torpediniformes (Chondrichthyes, Batoidea)

Table 2

Number of sites and chromosomal location of major and minor ribosomal genes in Torpediniformes species as evidenced with both the classical and the molecular cytogenetics methodology.

Species	Ag-NOR		CMA3		rDNA 18S		rDNA 5S
	Number of sites	Location	Number of sites	Location	Number of sites	Location	Number of sites	Location
T. marmorata	3	Telomeres of uni-armed elements	4	Telomeres of uni-armed elements	4	Telomeres of uni-armed elements	2	Telomeres of one uni-armed pair
T. nobiliana	3	Telomeres of one uni-armed pair + telomeres of one bi-armed element	4	Telomeres of one uni-armed pair + telomeres of one bi-armed pair	4	Telomeres of one uni-armed pair + telomeres of one bi-armed pair	2	Telomeres of one uni-armed pair
T. torpedo	3	Telomeres of one uni-armed pair and pericentromeric region of one bi-armed element	4	Telomeres of one uni-armed pair and pericentromeric region of one bi-armed pair	4	Telomeres of one uni-armed pair and pericentromeric region of one bi-armed pair	2	Telomeres of one uni-armed pair