TWO NEW SPECIES OF HAPLOSPLANCHNIDAE (DIGENEA) FROM LIZA CARANATUS FROM THE TAIWAN STRAITS, CHINA
- 生命科学－已发表论文 
单脏吸虫 ,新种Haplosplanchnuslizaesp nov 和巨卵希氏单脏吸虫 ,新种Schikhobalotremamegaovussp nov 检获于厦门集美附近海域棱Lizacarinatus肠道。单脏吸虫 ,新种Haplosplanchnuslizaesp nov与该属已知种的双腺单脏吸虫H bivitellosusZhukov,1971最为相似 ,它们都具有 2列卵黄腺 ,但在卵黄腺的组成和虫卵大小方面存在明显差别 ;巨卵希氏单脏吸虫 ,新种Schikhobalotremamegaovussp nov .与该属已知种的区别在于其虫卵 [0 130—0 14 2× 0 0 96— 0 12 0 (0 133× 0 10 8) ]特别大。Two new species of haplosplanchnid trematodes were descripted from Liza carinatus from the Taiwan Straits, China in this paper. Type specimens are deposited in Parasitology Research Laboratory, School of Life Sciences, Xiamen University. Measurements are given in millimeters, as the ranges followed by the mean in parentheses, unless otherwise stated. Haplosplanchnus lizae sp. nov. (Fig. 1) Type host:Liza carinatus (Cuvier et Valenciennes). Site of infection: Intestime. Type locality: Xiamen (118°03′58″—11′48″E,24°25′24″—33′14″N), Fujian Province, China. Date:Between Sept., 1999 and June, 2001. Prevalence: 313 specimens from 88 of 275 hosts. Description: (based on 10 mounted specimens) Body fusiform or short club-shaped, 1.00—1.40×0.49—0.68(1.23×0.60). Tegument smooth. Oral sucker subterminal, 0.144—0.208×0.188—0.232(0.170×0.200). Acetabulum 0.216—0.292×0.200—0.296(0.249×0.255). Sucker ratio 1∶1.22—1.48(1∶1.37).Prepharynx obscure or absent. Pharynx global,0.072—0.092×0.088—0.104(0.082×0.095). Esophagus 0.048—0.144(0.092)long. Intestine 0.168—0.312(0.245)long. Testis single, rounded or elliptical, 0.136—0.296×0.148—0.248(0.175×0.176),near posterior end of body. Seminal vesicular tubular, 0.608—0.696×0.032—0.042(0.661×0.038),terminating between acetabulum and ovary. Pars prostatica short, surrounded by prostatic cells. Genital pore between pharynx and acetabulum. Overy nearly global, 0.054—0.125×0.062—0.112(0.084×0.095),pretesticular. Receptaculum seminal sac in shape, 0.076—0.116×0.062—0.120(0.099×0.089),Uterus between testis and acetabulum. Vitellaria poorly developed, comprised by small vitelline follicles to form two bands on the dorsal side between ovary and acetabulum. Egg ovoid, 0.064—0.94×0.038—0.056(0.081×0.048). Fully embryonated eggs contain miracidia with eye-spots. Excretory vesicle “Y” shaped. The present species most closely resembles H. bivitellosus Zhukov, 1971 from Mugil so-iuy and M. cephalus from the basins of the Japan and Yellow Seas in baving two bands of vitellaria, but differs from it in the natural of vitellaria and egg-size. Schikhobalotrema megaovus sp. nov. (Fig. 2) Type host: Liza carinatus (Cuvier et Valenciennes). Site of infection: Intestine. Type locality: Xiamen(118°03′58″—11′48″E, 24°25′24″—33′14″N), Fujian Province, China. Date:Between Sept., 1999 and June, 2001. Prevalence:99 specimens from 34 of 275 hosts. Description: (based on 9 mounted specimens) Body fusiform, 0.97—1.35×0.52—0.69(1.19×0.56).Cuticle thick, smooth. Eye-spot pigment granules present on either sides of pharynx. Oral sucker nearly rounded, subtermina, 0.128—0.184×0.188—0.240(0.163×0.210). Acetabulum 0.194—0.248×0.220—0.288 (0.220×0.250).Sucker ratio 1∶1.24—1.31(1∶1.27). Prepharynx obscure or absent. Pharynx global, 0.108—0.152×0.126—0.196(0.126×0.158). Esophagus obscure. Intestinal caecum single, 0.192—0.510(0.340)long. Testis single, rounded or elliptical, 0.160—0.280×0.096—0.160(0.231×0.118),at as far bachwards as 0.080—0.136 (0.105)from the posterior end of the body. Seminal vesicle tubular, 0.296—0.344×0.024—0.052(0.325×0.036).Genital pore just behind pharynx. Ovary ovoid,0.100—0.136×0.050—0.090 (0.123×0.065), pretesticular. Receptaculum seminal saccular, 0.060—0.076×0.050—0.090(0.069×0.072). Uterus short,with a few eggs (Usually less than 5, not more than 10). Vitellaria follicles, distributing between acetabulm and the posterior end of the body. Eggs 0.130—0.142× 0.096—0.120(0.133×0.108),not embryonated. Excretory vesicle “Y” shaped, excretory stem short and bifurcating posterior to testis. More than 17 species of Schikhobalotrema have been described to date. The new species differs from them in having larger eggs.