Descriptions on three new digenetic species of fishes

Three new digenetic species belonging to Bucephalidae Poche, 1907, Paramphistomidae Fischoeder, 1901 and Gorgoderidae Looss, 1901 respectively were found from fishes and are described in this article. All the measurements are in millimetres. Type and Paratype specimens are deposited in the Laboratory of Fish Diseases, Institute of Hydrobiology, The Chinese Academy of Sciences Bucephalidae Poche, 1907 (1). Bucephalopsis mystis sp. nov. (Fig 1) Host: Mystus macropterus (Bleeker) Location: intestine Locality: Yinjiang County, Guizhou Province Body long spindle-shaped, spinulate, 0.75-1.57 times 0.25-0.53. Anterior sucker 0.047-0.090 times 0.043-0.076. Intestine saccular 0.082-0.21 times 0.054-0.088. Two testes tandem laterally in posterior 3/4 of body, anterior testis 0.071-0.18 times 0.095-0.18, posterior testis 0.086-0.18 times 0.071-0.22. Cirrus pouch 0.18-0.40 times 0.056-0.094, vesicular seminals 0.076-0.17 times 0.043-0.065. Ovary 0.065-0.19 times 0.065-0.16. Vitellaria forming two lateral or middle groups of 15-16 follicles each above ovary. Egg ellipsoid, 0.020-0.032 times 0.010-0.017. This species resembles B. pseudobagri Wang, 1980 and B. scombropsis Yamaguti, 1938, but differs from them in: body cuticle covered densely by minute spines; sucker, pharynx, intestine and cirrus pouch much smaller, inspite of the similar size in all the three species; pharynx behind intestine saccula; without hook-like lamella on sucker as described by Yamaguti (1938) and Wang (1980) in their fixed and non-fixed specimens. Paramphistomidae Fischoeder, 1901 (2). Neocladorchis wujiangensis sp. nov. (Fig. 2) Host: Barbodes sinensis (Bleeker), Ctenopharyngodon idellus (Curieret Valehciemes) Location: intestine Locality: Pengshui County, Sichuan Province Body 2.30-5.87 times 0.76-1.38. Oral sucker with large diverticles oral sucker 0.30-0.59 times 0.30-0.56, diverticle 0.15-0.26 times 0.13-0.25. Esophageal bulb 0.13-0.30 times 0.12-0.17. Acetabulum 0.48-0.89 times 0.52-1.01. Testes with irregular incisions, anterior testis 0.39-0.63 times 0.36-0.69, posterior testis 0.39-0.61 times 0.31-0.72. Cirrus pouch 0.17-0.39 times 0.12-0.19, genital pore befurcal. Ovary nearly rounded, 0.14-0.30 times 0.16-0.28. Egg 0.076-0.12 times 0.045-0.064. Lymph vessels three on each side. This species resembles N. poonaensis Bhalerao, 1937, but differs from it in: vitellaria extending outside the ceca between the front or middle level of posterior testis and acetabulum; ovary at the middle of posterior testis and acetabulum; egg shorter, 0.076-0.12 times 0.045-0.064. Gorgoderidae Looss, 1901 (3). Phyllodistomum (Vittellarinus) cyprini sp. nov. (Fig. 3) Host: Cyprinus carpio L. Location: ureter Locality: Daye County, Huberi Province Body elongate-oval, dorsoventrally flattened, covered with conical spines, mature body 4.46-6.78 times 1.28-1.80. Oral sucker 0.36-0.46 times 0.37-0.46, acetabulum 0.32-0.40 times 0.29-0.37, intercecal. Esophagus short, 0.11-0.25, ceca well-developed, with conspicuous lateral protrudings. Testes in irregular shape, right testis 0.20-0.33 times 0.21-0.29 left testis 0.24-0.34 times 0.21-0.23. Ovary with 2-3 notches, m 0.17-0.24 times 0.16 0.21. Vitellaria glands branched, 6-7 branches, left gland 0.25-0.37 times 0.16-0.17, right gland 0.26-0.41 times 0.13-0.22. Genital pore dorsally opened, 0.10-0.13 times 0.084-0.11. Egg 0.035-0.048 times 0.026-0.033. This species with conical spine on the surface and well developed ceca distinguishes itself from all of six known species of sub-genus Vittellarinus. The other differences from similar species Ph. (V.) conostomum (Olsson, 1876) and Ph. (V.) elongatum Nybeline, 1926 are in: oral sucker bigger than acetabulum, the testis only half as big as that of Ph. (V.) conostomum, in spite of their similarity in body size; testes, ovary, vitellaria glands near with each other, occupied one-fifth middle part of body