MEIOTIC CHROMOSOMES OF CYSTIDICOLA STIGMATURA AND C. CRISTIVOMERI (NEMATODA: SPIRUROIDEA)

1 September 1961

journal article
research article
Published by Canadian Science Publishing in Canadian Journal of Genetics and Cytology

Vol. 3 (3) , 231-236
https://doi.org/10.1139/g61-026

Abstract

The 11 chromosomes of spermatocytes in the two nematode species, Cystidicola stigmatura and C. cristivomeri form five bivalents and one univalent at meiosis I. The univalent is an acrocentric and heterochromatic sex chromosome which goes to one pole or the other in anaphase I while the bivalents divide regularly. The chromosomes apparently proceed directly from late anaphase I to prophase II, and they divide regularly in meiosis II so that spermatids receive either five or six chromosomes. These chromosomes remain separate and distinct for some time in the spermatids. The karyotypes total about 10 [mu] in length and are remarkably similar in the two species.

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