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Etude de l'Ultrastructure de Gregarina polymorpha (Hamm.) en Syzygie
Author(s) -
DEVAUCHELLE G.
Publication year - 1968
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.1550-7408.1968.tb02183.x
Subject(s) - biology , anatomy , ultrastructure , stimulus (psychology) , psychology , psychotherapist
SYNOPSIS. The electron‐microscope study of syzygy in Gregarina polymorpha , shows that this coupling, a prelude to cyst formation and to sexual phenomena, must not be considered as a simple pairing of individuals, but is rather the response of a gamont to a stimulus coming from another individual of a different sex. This response, in the species studied, can be recognized from the modifications that will appear progressively at the contact surfaces of the two gregarines. They affect only the protomerite apex of the posterior individual. There occur: rapid growth of the protomeritic epicyte; separation of this epicyte from the fibrillar zone underneath; formation of a protomeritic cup containing various inclusions; the disappearance of cuticular digitations and the formation of invaginations which become deeper and deeper. All these modifications occur as soon as syzygy starts. They seem to indicate a reaction of the satellite epicyte to a possible stimulus coming from the anterior female gamont. This epicyte could play a different part from the initial one. In the case of association between a primite and several satellites, the posterior gamonts react in a comparable manner but not together.