Synonyms: Eimeria wyomingensis Huizinga and Winger, 1942; Eimeria khurodensis Rao and Hiregaudar, 1954.
Hosts: Ox, zebu.
Location: Unknown. Oocysts found in feces.
Geographic Distribution: North America, Philippines, USSR, Africa (Nigeria), South America (Brazil).
Prevalence: This species is relatively uncommon. Baker (1938, 1939) and Christensen (1938) reported it in a heifer in New York, Christensen (1941) found it infrequently in Alabama, Huizinga and Winger (1942) found it in 10 cattle in Wyoming, and Hasche and Todd (1959) found it in 5% of 355 cattle in Wisconsin. Tubangui (1931) found it in 1 of 28 zebus in the Philippines. Yakimoff, Gousseff and Rastegaieff (1932) found it in 2 of 126 oxen in Uzbekistan. Yakimoff (1933)found it in 2 of 17 zebus and 1 of 41 oxen in Azerbaidzhan. Marchenko (1937) found it in 0.7% of 137 cattle from the North Caucasus. Yakimoff (1936) found it in 1 of 49 cattle in Brazil, Torres and Ramos (1939) reported it from 8% of 146 cattle in Brazil. Lee (1954) found it in a Fulani calf (zebu) in Nigeria.
Morphology: The oocysts are piriform, yellowish brown to dark brown, 33 to 54 by 24 to 35 u. Their length-width ratio is 1.3 to 1.8 with a mean of about 1.4. The oocyst wall is about 2 to 4 u thick except at the micropylar end, where it is thin. It is composed of 2 layers (3 according to Yakimoff, 1933), the outer one thick and the inner one a tough membrane. Tubangui (1931), Yakimoff (1933), and Lee (1954) described the wall as radially striated, but the only American author to note this feature was Baker (1939). The oocyst wall is speckled, and rather rough. The micropyle is conspicuous, 3.5 to 7 u in diameter. An oocyst residuum and polar granule are absent. The sporocysts are elongate lemon-shaped, 14 to 22 by 9 to 12 u. A Stieda body is possibly present. Definite sporocyst residual material is absent. The sporozoites were described by Tubangui as more or less roundish or reniform and illustrated without refractile globules. According to Huizinga and Winger, refractile globules are prominent, and it is possible that Tubangui mistook these for the sporozoites proper.
Rao and Hiregauder (1954) described a new species, E. khurodensis, from zebus in India. It failed to sporulate, and there is nothing in their description which differs from that of E. bukidnonensis.
The sporulation time is 4 to 7 days according to Christensen (1941), 5 to 7 days according to Huizinga and Winger (1942), 24 to 27 days according to Baker (1939).
Life Cycle: Unknown. Baker (1939) found that oocysts first appeared in an experimentally infected calf on the 10th day.
Pathogenesis: Baker (1939) observed a tendency toward a diarrheic condition from the 7th to 15th days after experimental infection of a 70-day old calf with 55 oocysts.