1989 年 54 巻 3 号 p. 539-546
164 whole mounted “screw like” chromosomes of Prorocentrum triestinum were morphometrically characterized by analyzing their axial length, coil number, diameter, pitch, tilt angle, total wings length and Weibel's lambda coefficient of form. Although the respective upper regions show to be similar, quantitative differences between chromosomes were found in the lower regions. The tilt angle increased 4° each of succesive coils, then progressivelly decreasing the chromosome diameter. To stablish the karyotype of a dinoflagellate for the first time, the chromosomes were ordered either by their respectives axial lengths and lambda coefficients of form. Thus, the 32 chromosomes of the Prorocentrum triestinum karyotype could be stablished.