【摘要】 <正> 1980—1982年间,中国水产科学研究院珠江水产研究所进行珠江水系水域渔业资源调查,并在日后陆续采获若干中小型东方鲀属鱼类标本。其中有50尾与曾记载过的其他种类有差异,经解剖比较研究后,认为是一新种,定名为圆斑东方鲀Takifugu orbimaculatus sp.nov.现描述如下: 圆斑东方的(新种)Takifugu orbimaculatus Kuang,Li et Liang sp.nov.更多还原

【Abstract】 From 1980--1982, the Zhu Jiang Fisheries Research Institute, Chinese Academy of Fisheries Science completed a survey of fishes in the estuary of the Zhu Jiang Ri- ver (Pearl River). 50 specimens of a new species of the genus Takifugu were collect- ed here, during that term and late. The description of the new species is given be- low. Takifugu orbimaculatus, Kuang Li et Liang sp. nov. (figs. 1--3) Diagnosis: Longitudinal ridges of the frontal bones of the skull fused with the posterior margin of the prefrontals. Prefrontal bones moderately developed and ex- panded laterally. Frontal bones narrower than the prefrontal bones. The free later- al margins of the frontal and sphenotic bones forming an obtuse or at right angle with each other. The skull is of the Takifugu oblongus type(fig. 3). Dermal pri- ckles well developed. The prickled areas are discontinuous, occuring dorsally and ventrally, but not in the lateral region anterior to the pectorat fiu (fig. 2). Description: Based on 50 specimens (including the holotype, allotype and para- types) 30--200mm, standard length, D. 13--14; A. 11--12; p. 16--17; vertebrae 21--22. Body lesselongate, tapering behind. Depth 3. 0--3. 6, 3, 4 head 3. 0--3. 6 in standard length. Snout 3. 2--3. 6, eye 4. 3-6. 7 in head. The dorsal region is greenish yellow in life and brownish gray following preservation in formalin. A dark round ocellus of mo- derate size with a wide white rim occurs laterally behind the pectoral fin. Also, a large dark triangular spot with a white rim occurs at the baseof the dorsal fin. Four dark bands cross the dorsal region, perpendicular to the lonitudinal axis of the body: the first is especially slender and is situated on the anterior region of the norse; the second and third are wide bands running between the eyes and dark ocelli respectively, and the fourth is found in the middle of the caudal peduncle (fig. 1). Remarks: Takifugu orbimaculatus sp. nov. is somewhat similar to juveniles of T. obscurus (Abe), but may be differentiated from the latter by the discontinuous dispo- sition of the prickled region of the pectoral fin, and by the absence of the lateral yellow stripe along the body. It also differs from T ocellatus (Linneaus) by having white rather than orange rims around the pectoral ocellus and large dorsal spot. The type of skull also differs from T. obscurus and T ocellatus. Named orbimaculatus in reference to the moderately large dark ocellus formed la- terlly behind the pectoral fin. Holotype: PR--810617, (?), 188 mm in standard length, collected on June 17, 1981, from the creek of Lianhuashan, Humen; allotype: PR--8406l8, (?), 143 mm in st- andard length, collected on June 18, 1884, from Genzhouhu, Xinhui; paratypes 108--166 mm in standard length: PR--840521 collected on May 21, 1984, from Genzhouhu, Xin- hui; PR--820620, on June 20, 1982, from Modaomen, Zhongshan; PR--810520, on May 20, 1981, from Lianhuashan, Humen, PR--840628, on June 28, 1984, from Genzhouhu, Xin- hui. The holotype and first two paratypes are deposited in Zhu Jiang Fisheries Rese- arch Institute (Guangzhou); the allotype and the latter two paratypes in the Institu- te of Oceanology, Academia Sinica (Qingdao).更多还原