Record Display for the EPA National Library Catalog


Main Title SEM (Scanning Electron Microscopy) Evidence for a New Species, 'Giardia psittaci' (Journal Version).
Author Erlandsen, S. L. ; Bemrick, W. J. ;
CORP Author Minnesota Univ., Minneapolis. Medical School.;Health Effects Research Lab., Research Triangle Park, NC.
Publisher c1987
Year Published 1987
Report Number EPA/600/J-87/391;
Stock Number PB89-105894
Additional Subjects Giardia ; Taxonomy ; Parakeets ; Scanning electron microscopy ; Morphology ; Reprints ; Giardia psittaci
Library Call Number Additional Info Location Last
NTIS  PB89-105894 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 8p
Giardia trophozoites were isolated from the small intestine of budgerigars (parakeets) and examined morphologically with light and scanning electron microscopy. The presence of a claw-hammer shape median body suggested classification of these trophozoites as G. duodenalis. However, unlike any known members of G. duodenalis, the Giardia trophozoites from budgerigars were morphologically distinct in that they lacked the ventrolateral flange and therefore did not have a marginal groove bordering the anterior and lateral border of the adhesive disc. The distinct morphology clearly indicated that trophozoites from budgerigars should be considered as a separate species, G. psittaci. The evidence has demonstrated that median body shape cannot serve as a sole criterion for speciation of Giardia. In addition, if other avian species of Giardia also resemble G. psittaci, then this would suggest that evolutionary divergence has occurred in the genus Giardia. (Copyright (c) American Society of Parasitologists 1987.)