Ultrastructure and division behaviour of dinoflagellate chromosomes. II. Quantitative three-dimensional organization and karyotype of Prorocentrum triestinum.

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Abstract
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.degree. each of succesive coils, then progressively decreasing the chromosome diameter. To establish the karotype 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 established.

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