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Comparative Study of Ultrastructure of Interlamellar and Intralamellar Types of Henneguya exilis Kudo from Channel Catfish * †
Author(s) -
CURRENT WILLIAM L.,
JANOVY JOHN
Publication year - 1978
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.1550-7408.1978.tb03868.x
Subject(s) - ultrastructure , parasite hosting , cytoplasm , protein filament , biophysics , membrane , catfish , chemistry , anatomy , biology , materials science , microbiology and biotechnology , composite material , fish <actinopterygii> , world wide web , computer science , biochemistry , fishery
SYNOPSIS. The inter‐ and intralamellar types of Henneguya exilis Kudo (Myxosporida) infections from channel catfish are similar in spore structure and sporogenesis, but differ in the structure of their plasmodium wall and surface coat and in their relationship with the host cells. The 2 clinical types differ also in the sites of development and growth patterns of plasmodia within a gill filament. Interlamellar plasmodia are limited by 2 outer unit membranes which give rise to both single‐and double‐membraned pinocytic canals. Intralamellar plasmodia are limited by a single outer unit membrane which gives rise to single‐membraned pinocytic canals. Interlamellar plasmodia are covered by a fine granular coat of highly variable thicknesses; in some regions there is direct contact between the parasite and cells of the host. There is some evidence that host cell cytoplasm as well as interstitial material are taken in by interlamellar plasmodia. In contrast, intralamellar plasmodia are covered by a fine granular coat of almost uniform thickness, which prevents direct contact between the parasite and cells of the host; probably only interstitial material is taken by these plasmodia.