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ji sheng zai qian se shui she de zhui chong yi xin zhong
Pages: 119-121
Year: Issue:  2
Journal: Acta Zootaxonomica Sinica

Keyword:  新种动基体渔游蛇铅色水蛇寄生虫学游离鞭毛测量数据草游蛇标本保存;
Abstract: Trypanosoma rostellata, sp. nov. (fig. 1)This new species is a blood parasite of the fresh water snake Enhydris plunbea collected from the country side of Gaoyao county (23°N, 112°E), Guangdong province, China. 33 of 55 snakes examined were found infected with this trypanosome, but the parasitaemia was low, usually less than 20 parasites in a blood smear. The average length of this trypanosome is 97.5(68.9-115.7)μ, width 11.6(7.6-18.2)μ, free flagel-lum 12.2(8-16.8)μ. The nucleus is round or ellipsoid, pink when stained with Gie-msa, with average size of 4.06x3.25(2.6×2.6-6×3,9)μ. The kinetoplast is brightly red when stained with Giemsa and is very close to the nucleus. PK is 35.1(27.3-48.1)μ; PN 38.1(28-52)μ, KN 3.4(2-5.2)μ, KI(PN/KN) 11.2; AN 51.8(35.1-61.1)μ, NI (PN/AN) 0.74. The parasite is not actively motile and usually moves spirally at the original position. The cytoplasm is deep blue when stained with Giemsa but becomes much paler in the posterior portion of the parasite. The undulating membrane is not well developed, with 6 to 13 folds. The anterior end of this parasite is usually bluntly round, with a small tail-like cytoplasmic extension.Host: Enhydris plumbea Boie.Location in host: Blood.Locality: Gaoyao county (22°50′N, 112°20′E), Guangdong.Holotype: P-21; Paratypes: P-25, P-26; Aug. 1981.Type specimens are deposited in the Laboratory of Parasitology, Department of Biology, Zhongshan University, Guangzhou.This new species resembles the large form of T. enhydris in length, but differs from it in width. The latter is obviously polymorphic which is not seen in the present new speices. Furthermore, T. rostellata cannot infect Natrix stolata experimentally whereas T. enhydris readily does. It differs from T. primeti in being not dimorphic and cannot experimentally infect Natrix piscator as the latter does. This new species also differs from T. superciliosae, a trypanosome of lizard Uranoscodon superctliosa in the length of nucleus and in the remote phylogenetic relationship of their natural hosts.
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