title: Are chromosomal axial struc-ures and microtubular systems phylogenetic markers in the dinoflagellates?
abstract: Two new events concerning nuclear division and chromosomal predivision are described in the free-living marine dinoflagellate Prorocentrum micans E. considered by Loeblich (1976) as a primitive form. These events will be discussed in relation to the evolution of Dinoflagellates. (1) Presence of a paranuclear bundle of microtubules parallel to the extranuclear bundle passing through the dividing nucleus (Soyer, 1975, 1977b) and (2) Presence of a chromosomal axis in the predividing chromosomes (Soyer, 1977c).
mesh_terms: D000818:Animals; D002455:Cell Division; D002875:Chromosomes / Q000648:ultrastructure*; D004141:Dinoflagellida / Q000648:ultrastructure*; D056890:Eukaryota / Q000648:ultrastructure*; D008870:Microtubules / Q000648:ultrastructure*; D009685:Nuclear Envelope / Q000648:ultrastructure; D010802:Phylogeny