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Cell Division in Gonyaulax catenella , A Marine Catenate Dinoflagellate *
Author(s) -
TOMAS RONALD N.
Publication year - 1974
Publication title -
the journal of protozoology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.067
H-Index - 77
eISSN - 1550-7408
pISSN - 0022-3921
DOI - 10.1111/j.1550-7408.1974.tb03661.x
Subject(s) - cytokinesis , mitosis , cell division , microbiology and biotechnology , dinoflagellate , interphase , biology , nucleolus , cleavage furrow , nucleus , genetics , cell , botany
SYNOPSIS Mitosis and cytokinesis are described and illustrated for the first time in the mesokaryotic, catenate dinoflagellate Gonyaulax catenella. A structure similar to the central body of G. tamarensis and G. monilata is shown by light and electron microscopy to be situated intranuclearly near the arms of the U‐shaped interphase nucleus, and is suggested to function in the segregation of daughter chromosomes. This structure has the fine structure of a nucleolus, and it is suggested that the term central body be replaced by persistent nucleolus (= endosome). The time required for the completion of mitosis is 4–6 hr, while cytokinesis requires at least 2 hr. Cytokinesis begins during the mitotic cycle, and the plane of fission is perpendicular to the mitotic plane of division. Parental fission moieties are retained and shared by the daughter cells while either a new antero‐sinistral moiety or a posterodextral moiety is synthesized by the dividing cell.