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New developments in vertebrate cyto taxonomy 6. cyto taxonomy and evolution of lower chordates



New developments in vertebrate cyto taxonomy 6. cyto taxonomy and evolution of lower chordates



Genetica (Dordrecht) 58(2): 97-102



A correlation between evolutionary trends and karyotype was recognized in tunicates. In the ambit of lower chordates and related species, Hemichordata, Cephalochordata and, in the Tunicata, some ascidians seem to maintain a primitive organization of chromosomes: haploid numbers around 20, absence of sex chromosomes and rod-shaped bivalents. Within the class Ascidiacea, at the karyological level Clavelina lepadiformis seems to be very specialized and the family Perophoridae (suborder Phlebobranchiata) very primitive. Thaliacea and Larvacea appear specialized in comparison with the primitive ascidians.

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