Other species of Hexamita
Hexamita columbae (Noller and Buttgereit, 1923) (syn., Octomitus columbae) occurs in the duodenum, jejunum, ileum and large intestine of the pigeon. It is 5 to 9 u long and 2.5 to 7 u wide. It is pathogenic, causing a catarrhal enteritis. Noller and Buttgereit (1923) found it in great masses from the gizzard to the anus in a pigeon with catarrhal enteritis in Germany, and McNeil and Hinshaw (1941) found it in affected pigeons in California. They were unable to infect turkeys with this species.
Hexamita was found by Kotlan (1923) in the intestinal mucus of the domestic duck in Hungary. He called it "Hexamitus intestinalis (?)". It was usually piriform, 10 to 13 u long and 4 to 5 u wide. Kimura (1934) found Hexamita in the ceca and large intestine of domestic ducks in California. McNeil and Hinshaw (1941) infected domestic ducks experimentally with H. meleagridis from the turkey. It is uncertain whether the duck form is a separate species. It has not been adequately described, and its pathogenesis is unknown.
Hexamita muris (Grassi, 1881) (syns., Octomitus muris, Syndyomita muris) occurs in the posterior small intestine and cecum of the Norway rat, house mouse, golden hamster and various wild rodents. It measures 7 to 9 by 2 to 3 u.
Wenrich (1933) described Hexamita sp. from the feces of a rhesus monkey. It measured 4 to 6 by 2 to 4 u.