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Four new rumen ciliates, Entodinium ogimotoi sp. n., E. bubalum sp. n., E. fujitai sp. n. and E. tsunodai sp. n. and Oligoisotricha bubali (Dogiel, 1928) n. comb.

1981; Japanese Society of Veterinary Science; Volume: 43; Issue: 2 Linguagem: Inglês

10.1292/jvms1939.43.201

1881-1442

Soichi IMAI,

Genomics and Phylogenetic Studies

A survey was conducted on 29 water buffaloes, Bubalus bubalis (Linnaeus), in Taiwan to clarify the geographical distribution of rumen ciliate protozoa. Four new species of the genus Entodinium were recognized: E. ogimotoi sp. n., E. bubalum sp. n., E. fujitai sp. n. and E. tsunodai sp. n. E. ogimotoi is rectangular to nearly square in body contour with 2 flattened triangular lobes at the posterior end of the body. Cytoproct is situated right on the median line. The body is 30-47 μm long. E. bubalum is ovoid or elliptical with 2 caudal spines, which are close to each other and situated near the middle of the posterior end of the body. The upper-right spine is shorter than the lower-left one. The body is 25-45 μm long. E. fujitai is asymmetrical in shape. Its body surface is strongly convex on the right side and concave in the anterior half of the left side. Its tail is composed of 2 heavy spines. The body is 23-32 μm long. This species is closely related to E. gibberosum Kofoid et MacLennan, 1930 and E. triangulatum Dehority, 1979. However, E. fujitai is distinguished from the former by the presence of a relatively short macronucleus without a notch, and from the latter by the absence of the triangular wedge of ectoplasm. E. tsunodai is ovoid, with 4 caudal spines. Of these spines, two are situated laterally and the others centrally. One of the two central spines is larger than any other spine, and the other three are of essentially the same size. The body is 28-40 μm long. This species is closely related to E. indicum Kofoid et MacLennan, 1930, from which it is distinguished by the number of caudal spines and the situation of a contractile vacuole. Isotricha bubali, detected and described first by Dogiel from the water buffalo in Turkestan, was redescribed and the new genus, Oligoisotricha, was proposed for it.