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A Redescription of the Holotrichous Ciliate Pseudomicrothorax dubius with Particular Attention to its Morphogenesis *
Author(s) -
THOMPSON JESSE C.,
CORLISS JOHN O.
Publication year - 1958
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.1550-7408.1958.tb02548.x
Subject(s) - ciliate , morphogenesis , biology , zoology , anatomy , evolutionary biology , ecology , genetics , gene
SYNOPSIS.Pseudomicrothorax dubius , a rather rare protozoon assigned by Kahl to the trichostome order of ciliates, has been found and positively identified for the first time in America, and its morphology and morphogenesis have been studied in detail with the aid of modern techniques. The Chatton‐Lwoff silver impregnation method is considered indispensable in acquiring an understanding of the ciliate's infraciliature: both its anatomy in the mature vegetative animal and its activities during the morphogenetics of binary fission. Stomatogenesis is of a complex type, considered here as “semi‐autonomous” in nature, although a single, true stomatogenous meridian also is involved. Details of this explicit morphogenetic phenomenon are offered. The presence of a true zone of three adoral membranelles, never before recognized with any accuracy in this ciliate, a buccal cavity and associated structures, and the mode of stomatogenesis have led the writers to propose transfer of the genus Pseudomicrothorax from the Trichostomatida to the order Hymenostomatida.