Family Pycnotrichidae

In this holotrichasin gymnostomorid family, a long groove leads to the cytostome, which may lie near the middle or at the posterior end of the body. The body is completely ciliated. This family contains 2 genera in ruminants whose names may actually be synonymous.

Genus Buxtonella

The body is ovoid and uniformly ciliated, with a prominent curved groove bordered by 2 ridges running from end to end. The cytostome is near the anterior end.

Buxtonella sulcata Jameson, 1926 is common in the cecum of the ox, zebu and water buffalo. The trophozoites measure 60 to 138 by 46 to 100 u with a mean of 100 by 72 u, and have an oval or beanshaped macronucleus measuring 18 to 36 by 10 to 18 u with a mean of 28.5 by 14 u (Lubinsky, 1957).

According to Lubinsky (1957), the reports of "Balantidium" in cattle were actually of B. sulcata.

Infundibulorium cameli Bozhenko, 1925, which was described from the diarrheic stools of a camel, may be the same species as B. sulcata. If so, the name will have to be changed, since Infundibulorium has priority (Lubinsky, 1957a).