Tyzzeria is a genus of parasitic protozoa

Protozoa

Protozoa are a diverse group of single-cells eukaryotic organisms, many of which are motile. Throughout history, protozoa have been defined as single-cell protists with animal-like behavior, e.g., movement...

 that with one exception (Tyzzeria boae) infect the cells of the small intestine

Small intestine

The small intestine is the part of the gastrointestinal tract following the stomach and followed by the large intestine, and is where much of the digestion and absorption of food takes place. In invertebrates such as worms, the terms "gastrointestinal tract" and "large intestine" are often used to...

.

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.

Host-parasite relations

Tyzzeria allenae - common goldeneye (Chenicus coromandelianus)

Tyzzeria boae - red tailed boa (Boa constrictor constrictor

Boa constrictor

The Boa constrictor is a large, heavy-bodied species of snake. It is a member of the family Boidae found in North, Central, and South America, as well as some islands in the Caribbean. A staple of private collections and public displays, its color pattern is highly variable yet distinctive...

)

Tyzzeria chalcides - ocellated skink (Chalcides ocellatus

Chalcides ocellatus

Chalcides ocellatus, or Ocellated Skink is a species of skink found in Greece, southern Italy, Malta, and parts of northern Africa....

)

Tyzzeria chenicusae - common goldeneye (Chenicus coromandelianus)

Tyzzeria galli - Ceylon jungle fowl (Gallus lafayettei)

Tyzzeria natrix - yamakagashi (Rhabdophis tigrinus

Rhabdophis tigrinus

Rhabdophis tigrinus is a venomous colubrid found in East and Southeast Asia. No subspecies are currently recognized.-Description:The dorsal color pattern is olive-drab green with black and bright orange crossbars or spots from the neck down the first third of the body. The belly is whitish...

)

Tyzzeria parvula - greater white-fronted goose (Anser albifrons), greylag goose (Anser anser), snow goose (Anser caerulescens), Ross' goose (Anser rossii), brent goose (Branta bernicla), Canada goose (Branta canadensis), tundra swan (Cygnus columbianus)

Tyzzeria pellerdyi - northern pintail (Anas acuta), American wigeon (Anas americana), northern shoveler (Anas clypeata), common teal (Anas crecca), blue-winged teal (Anas discors), mallard (Anas platyrhynchos), gadwall (Anas strepera), ferruginous duck (Aythya nyroca)

Tyzzeria perniciosa - northern pintail (Anas acutus), mallard (Anas platyrhynchos), lesser scaup (Anas affinis), lesser white-fronted goose (Aythya erythropus), tufted duck (Aythya fuligule), white-headed duck (Oxyura leucocephala), common shelduck (Tadorna tadora)

Tyzzeria peomysci - white-footed mouse (Peromyscus leucopus), deer mouse Peromyscus maniculatus

Peromyscus maniculatus

Peromyscus maniculatus is a rodent native to North America. It is most commonly called the Deer Mouse, although that name is common to most species of Peromyscus and is fairly widespread across the continent, with the major exception being the southeast United States and the far north.Like other...

)

Tyzzeria perniciosa - lesser scaup (Aythya affinis)

Tyzzeria typhlopis - European blind snake (Typhlops vermicularis

Typhlops vermicularis

Typhlops vermicularis, the European blind snake or European worm snake, is a reptile species in the genus Typhlops found in Europe and in Lebanon ....

)