Tyzzeria

Tyzzeria is a genus of parasitic alveolates that with one exception infect the cells of the small intestine.

History

The genus Tyzzeria was first described by Allen in 1936.
As is all too common in protozoal taxonomy the validity of several of the species is controversial. Species occurring in Anseriforme birds appear to be valid whereas the other species may be misidentifications. The application of DNA based methods it is to be hoped will resolve these matters.

Description

The oocysts lack sporocysts: each oocyst possesses eight sporozoites.

Host-parasite relations

Tyzzeria allenae - common goldeneye

Tyzzeria boae - red tailed boa

Tyzzeria chalcides - ocellated skink

Tyzzeria chenicusae - common goldeneye

Tyzzeria galli - Ceylon jungle fowl

Tyzzeria natrix - yamakagashi

Tyzzeria parvula - greater white-fronted goose, greylag goose , snow goose, Ross' goose, brent goose, Canada goose, tundra swan

Tyzzeria pellerdyi - northern pintail, American wigeon, northern shoveler, common teal, blue-winged teal, mallard, gadwall, ferruginous duck

Tyzzeria perniciosa - northern pintail, mallard, lesser scaup, lesser white-fronted goose, tufted duck, white-headed duck, common shelduck

Tyzzeria peomysci - white-footed mouse

Tyzzeria perniciosa - lesser scaup

Tyzzeria typhlopis - European blind snake