Table 4.

Major features of the karyotypes of G. aculeatus and A. quadracus

Species	Sex	2n	Chromosomes				NF
			metacentric	submetacentric	acrocentric	telocentric
G. aculeatus	female	42	8	6+2X	16	10	58
	male	42	8+Y	6+X	16	10	58
A. quadracus	female	46	6	4	32	4	56
	male	46	6	4	32	4	56

2n = Diploid number; NF = fundamental number.