NOTE ON DIGENETIC TREMATODES PARASITIC IN FISHES NEAR SHALLOW SEA IN GUANGDONG PROVINCE,CHINA I.CRYPTOGONIMIDAE AND HAPLOPORIDAE (DIGENEA)

This paper reports two new species and one new genus of the members belonging to Di-genea, all specimens from fishes of the family Mugilidae collected from the coast waters ofHuidong County, Guangdong Province. Of the two species, one belongs to the new genus ofsubfamily Tubanguiinae, Cryptogonimidae and the other to the genus Saccocoelioides, Haplo- poridae. Measurements are in millimeters. All the type specimens are deposited in the Ichthy-ological Lab, Department of Biology, Zhongshan University. Tandemorchis gen. nov. Generic diagnosis Body small, ovoid in shape, spinulate with one pair of eyespots. Oralsucker terminal, followed by a developed pharynx. Oesophagus short. Caeca long sac--shapedor short sac--shaped, reaching to the posterior area of the middle part of body or the front ofthe posterior testis. Acetabulum absent. Testes double, tandem, existed in longitudinal axisof the body. Seminal vesicle oval--shaped, located on the ventral side of the anterior testis.Genital pore situated near the intestinal bifurcation. Ovary located between two testes.Laurer's canal present. Vitellaria distributed in each side of ovary. Uterus containsa feweggs. Full embryonated eggs contain miracidia with eyespots. Excretory vesicle V--shaped,stems reaching nearly to eyespots. Parasitic in intestine of marine fishes. Genotype: Tandemorchis yuedongensis. The new genus differs distinctly from genus Tubanguia Srivastava, 1935 in having eye-spots. no prepharynx, much shorter caeca, different disposition of the oral sucker and vitel-laria. etc. Tandemorchis yuedongensis sp. nov. (fig. 1 and 2) Hosts Migil macrolepis Smith. Location Intestine. Locality Huangfu Town, Huidong County (22°41′N, 114°55′E). Date January 8, 1990. Type specimens Holotype N901;Paratypes N902,N903. Body ovoid to elliptical, covered with cuticular spines. Total length 0. 3225 --0. 3295(0. 3250), maximum width 0. 2250--0. 2475 (0. 2450 ). Two eyespots located in each side ofpharynx. Left 0. 0150×0. 0150, right 0. 0175×0. 0145. Oral sucker terminal, 0. 0450--0. 0495×0. 0490--0. 0525 (0. 0475×0. 0500). Prepharynx absent. Pharynx oval in shape,0. 0225-- 0. 0260×0. 0245 -- 0. 0275 (0. 0250×0. 0250). Oesophagus 0. 0050 -- 0. 0085(0. 0075). Caeca long sac--shaped, reaching to the posterior area of the middle part of body orthe front of the posterior testis. Testes double and tandem. Anterior testis 0. 0850--0. 0895×0. 0725 -- 0. 0790 (0. 0875×0. 0775); posterior one 0. 0625--0. 0675×0. 0800--0. 0850(0. 0650×0. 0825). Seminal vesicle oval in shape, situated on the ventral side of the anteriortestis, 0. 0525 --0. 0575×0. 0500--0. 0550(0. 0550×0. 0525). Male genital pore opening inde-pendently in genital atrium located near the intestinal bifurcation. Ovary elliptical, 0. 0400 ---0. 0450×0. 0300--0. 0355 (0. 0425×0. 0325), located between the testes. Seminal receptacleovoid--shaped, existed on the left side of the posterior testis, 0. 0325 -- 0. 0375×0. 0530---0. 0575 (0. 0350×0. 0550). Laurer's canal present. Vitellaria distributed in each side of ovary.Uterine coils chiefly between genital pore and ovarian complex. Metraterm opens separatelyfrom the male aperture. Egg ovoid in shape, 10--15 in numbers in uterus, 0. 0275--0. 0300× 0. 0400--0. 0425 (0. 0280×0. 0420). Fully embryonated eggs contain miracidia with eyespots.Excretory vesicle V--shaped, arms reaching to near eyespots. Saccocoelioides huidongensis sp. nov. (fig. 3 and 4) Hosts Mugil parvus (Oshima). Location Intestine. Locality Dazhou Town, Huidong County (22°42' N, 114°54' E). Date September 5,1990. Type specimens Holotype S905; Paratype S906 7. Body 0. 675--0. 080 (0. 074) in length with breadth 0. 170--0. 175(0. 1725). Body elon-gate, covered with spines. Oral sucker terminal, 0. 0975 -- 0. 1150×0. 0900 -- 0. 1175, fol-lowed by prepharynx, 0. 0225--0. 0250. Pharynx ovoid in shape, 0. 0725--0. 0950×0. 0700-0. 1000. Oesophagus short, with developed muscular tissue, 0. 0152 -- 0. 0175. Caeca sac-shaped, reaching to front level of ovary. Acetabulum developed, 0. 0950--0. 1500×0. 0925-0.