【摘要】 <正> 本文报道了斯氏并殖吸虫的两种螺类宿主。标本系1979年6—9月及1981年10—12月釆自湖北省的兴山县和五峰县。经过详细的分析研究,鉴定为新种,分别隶属于觿螺科的小豆螺属(Bythinella)和拟小豆螺属(Pseudobythinella)。并命名为建国小豆螺和刘氏拟小豆螺。正模和副模标本均保存在湖北医学院寄生虫学教研室医学贝类研究组。现将新种描述如下。 1.建国小豆螺(新种)Bythinella gongjianguoi sp.nov.(图1—2)更多还原

【Abstract】 The present paper reports on two molluscan hosts of the lung fluke Paragonimus skrjabini Chen, 1959. The specimens were collected in Wufeng County and Xingshan County, Hubei Province from June to September, 1979 and October to December, 1981. After having been examined they prove to be new to science, belonging to two different genera of the family Hydrobiidae, namely Bythinella gongjianguoi n.sp.and Pseudobythinella liui n.sp. Holotype and Paratype specimens are deposited in the Department of Parasitology, Hubei Medical College. The diagnoses of these new species are given below. Bythinella gongjianguoi sp. nov. (Figs. 1—2) Diagnosis The shell of this species is short cylindrical, minute, thin and translucent; with an obtuse apex, sometimes incomplete; consisting of 4—4(1/2) whorls. The color of uncleaned shells varies from light yellow to reddish-brown. The shell surface is smooth except for very fine axial lines of growth. The whorls are more convex and scalariform, increase rapidly in height, but slowly in breadth. The suture between each two whorls is distinct, pronounced but narrow. The first whorl is minute, the penultimate and antepenultimate whorls are band-shaped. The body whorl is fairly large, about two-thirds of the length of the shell. The aperture is widely ovate, continuous, with a black margin. The outer lip is simple, thin, roundly curved, and not reflected. The inner lip is more or less straight and slightly expanded outward its middle portion closely adherent on the surface of the body whorl. The umbilicus is narrow, chink-like. The operculum is elliptical in shape, horny, thin, yellowish-brown, transparent, with fine curved growth lines. In the radula the central tooth has the formula (3-1-3)/(2-2). The lateral tooth has 6 denticles, of which the third is larger than the rest. The inner marginal has 24 denticles, the outer 18. Holotype Length 2.2mm, breadth 1.1mm; length of aperture 0.636mm, breadth of aperture 0.877mm; collected on June 30, 1979 at Longtouping, Sanyang Commune, Xingshan County, Hubei Province. Paratypes Length 1.9—2.2mm, breadth 1—1.1mm; length of aperture 0.602—0.688mm, breadth of aperture 0.67—0.87mm; collected on June 30, 1979 and on September 4, 1979 from Longtouping, Sanyang Commune, Xingshan County, Hubei Province. Parasite Paragonimus skrjabini Chen, 1959. Remarks This new species is related to Bythinella nipponica Mori, 1937 but differs from the latter by its larger size, and more convex whorls and by its radula formula: (3-1-3)/(2-2); 2-1-3; 24; 18. Etymology The new species is named after Comrade Gong Jianguo the first case of paragonimiasis in Hubei Province, identified by the author in early June, 1964. Pseudobythinella liui sp. nov. (Figs. 3—5) Diagnosis The adult shell is minute, cylindrical, very thin, dull white, and transparent. The shell surface is smooth, without ribs, but under high magnification it shows very weak growth lines which are sometimes indistinct. Whorls 4—4(1/2), each of which is somewhat convex and scalariform. The body whorl is large, occupying about 70％ of the shell length. The apex is low and blunt. The suture is well constricted. The aperture is ovate, continuous, with a chestnut brown margin. The outer lip is simple, smooth and round curved. The inner lip is slightly reflected but not attached to the body whorl, and under high magnification a rift may be seen between them. There is a small tooth at the middle part of inner lip. This character is similar to that of Pseudobythinella. The umbilicus is narrow and distinct. The operculum is ovate, corneous, very thin, fragile, white, transparent, paucispiral with excentric nucleus. In the radula the central tooth has the formula (4-1-4)/(2-2). There are 8 denticles on the lateral tooth, of which the fourth is larger than the rest. The inner marginal has 25 denticles, the outer 19. Holotype Length 2mm, breadth 0.87mm; length of aperture 0.78mm, breadth of aperture 0.61mm; collected on October 26, 1981 at the Yangjia River, Yuguan Commune, Wufeng County, Hubei Province. Paratypes Length 1.8—2.1mm, breadth 0.87—0.95mm; length of aperture 0.69—0.87mm, breadth of aperture 0.57—0.69mm; collected with the holotype. Parasite Paragonimus skrjabini Chen, 1959. Remarks This species closely resembles Pseudobythinella jianouensis Liu et Zhang, 1979 in many respects. But the shell of the species in question is larger than that of Liu’s species and the whorls in most cases of our specimens are more convex, the breadth of body whorl is always wider than that of penultimate, the color within the aperture is light yellow rather than porcellaneous, and the radula formula is also different. Etymology The new species is dedicated to Prof. Liu Jiankang, the famous Chinese ichthyologist and ecologist, member of the Division of Biological Science, Academia Sinica, the director of the Institute of Hydrobiology, Academia Sinica.更多还原