淡水鱼类寄生粘孢子虫九新种

NINE NEW SPECIES OF MYXOSPORIDIA FROM FRESHWATER FISH OF WUHU LAKE, HUBEI, CHINA

作者于1983—1984年，调查了湖北省五湖鱼类寄生粘孢子虫区系，所发现的粘孢子虫，经鉴定有9种是新种(其中两极虫Myaldium 2种，粘体虫Myxosoma 1种，碘泡虫Myxobolus 6种)。测量孢子大小，均是经5％福尔马林固定的标本。

Nine new species of Myxosporidia from freshwater fish, all from Wuhu Lake of Hubei Province, China, are described. Measurements are in microns. Type specimens are deposited in Institute of Hydrobiology Academia Sinica.1. Myxidium oliviformis sp. nov. (figs. 1—4)Host: Leiocassis albomarginatus Ren.Location: IntestineVegetative form: Not observedSpore: Oliviform in front and sutural view. Sutural ridge straight and distinct. Six to eight streaks on shell valve. Two equal-sized pyriform polar capsules at both ends of spore. Sporoplasm with coarse granules.Dimension: Spores 17.14(16.7—17.9)long by 7.62(6.66—8.33)wide and 7.62(7.14—8.33) thick. Two poIar capsules 5.69(4.8—6.2) by 5.31(4.76—6.19). Interval between capsules 3.89 (3.4—4.8).This species differs from Myxidium rhinogobides Nie et Lee (1964) in length of spore, host and location.2. Myxidium acanthobramae sp. nov. (figs. 5—8)Host: Acanthobrama simoni BleekerLocation: Gall-bladderVegetative form: Sporont with two spores, trophozoite of early stage not found.Spore: Paramecium-like in front and sutural view, with one end rather broad. Sutural ridge fine and straight. 7—8 streaks on shell surface. Two pyriform polar capsules unequal in size. With two small nuclei.Dimension. Spores 14.28 (13.8—14.52) by 6.66 (5.95—7.14). Larger polar capsule 3.81 (3.33—4.05) by 3.69(3.3—4.05), smaller polar capsule 3.02(2.86—3.09) by 2.86(2.62—3.09). Interval between capsules 5.24(4.76—5.95).This species differs from all recorded species of Myxidium by having spore with one end broader than the other, and with two unequal-sized polar capsules.3. Myxosoma paramisgurni sp. nov. (figs. 9—12)Host: Paramisgurnus dabryanus S.Location: KidnevVegetative form: Cyst rounded, milk-white in color, about 1.5 mm in diameter.Spore: Rounded in front view, fusiform in sutural view. Sutural ridge straight and dis- tinct. With 4—5 V-shaped folds at posterior margin. Polar capsules oliviform, coiled polar filament and intercapsular appendix distinct. Sporoplasm finely granular, without iodinophilous vacuole.Dimension: Spores 11.9(11.19—12.14) long by 11.07(10.71—11.9) wide and 7.14(6.9—7.38) thick. Polar capsules 5.95(5.47—6.43) long by 4.28(4.05—4.52) wide.Myxosoma paramisgurni sp. nov. resembles Myxosoma circulus (Achmerov, 1960), but differs from the latter in its fusiform spore, with posterior V-shaped folds and oliviform polar capsules.4. Myxobolus wuhuensis sp. nov. (figs. 13—16)Host: Parasilurus asotus (Linnaeus)Location: IntestineVegetative form: Not observedSpore: Pumpkin seed-shaped with three V-shaped folds at posterior magin of shell-valve in front view. Fusiform in sutural view. Sutural ridge fine, straight and distinct. Polar capsules rod-shaped. Sporoplasm finely granulated. A small iodinophilous vacuole present.Dimension: Spores 9.52(9.04—9.76) long by 6.9(6.66—7.14) wide and 4.36(4.25—4.76) thick. Polar capsules 4.28(3.81—4.52) long by 2.02(1.9—2.14) wide.This species resembles Myxobolus mutabilis Kudo (1934), but differs from the latter in narrower anterior end, with V-shaped fold posteriorly, and in the unthickened shell magin.5. Myxobolus reniformis sp. nov. (figs. 17—20)Host: Parasilurus asotus (Linnaeus)Location: IntestineVegetative form: Not observedSpore: Heart-shaped in front view. Convex in sutural view and end view. Sutural ridge broad and straight. Intercapsular appendix distin(?)t. Two polar capsules unequal in size nearly pyriform. Sporoplasm evenly distributed, with a small iodinophilous vacuole and two nuclei.Dimension: Spores 10.23(9.52—11.42) long by 13.69(13.09—14.28) wide and 8.33(7.85—8.57) thick. Larger polar capsule 6.9(6.43—7.38) by 5.36(5.0—5.95); the smaller, 6.31(5.95—6.66) by 4.9(4.7—5.24).This species differs from Myxobolus changshouensis Ma et al (1982) by having spore of greater dimensions and smaller ratio of length to width of capsule.6. Myxobolus hubeiensis sp. nov. (figs. 21—24)Host: Saurogobio dabryi (Temm. et Schl.)Location: BrainVegetative form: Cyst white, rounded, about 1 mm in diameter.Spore: Round in front view. Fusiform in sutural view. Sutural ridge straight and distinct. Without V-shaped fold at shell-valve. Intercapsular appendix distinct. Two polar capsules equal in size, pyriform. Sporoplasm with coarse granules, with an iodinophilous vacuole.Dimension: Spores 12.04(11.66—12.38) long by 11.88(10.7—12.14) wide and 8.93(8.57—9.05) thick. Polar capsule 5.78(5.24—6.19) by 3.88(3.09—4.52).This species resembles Myxobolus obovoides Lee et Nie (1965), but differs from the latter in the greater thickness of the spore, the smaller width of the capsules and the absence of V-shaped fold at the shell-valve.7. Myxobolus acutus sp. nov. (figs, 25—28)Host: Carassius auratus (Linnaeus) Locations: Gill and kidneyVegetative form: Not observedSpore: Pyriform in front view. Fusiform in sutural plane. Sutural ridge straight and conspicious. Two capsules unequal in size, pyriform. Sporoplasm evenly distributed, with a rounded and large iodinophilous vacuole and two nuclei.Dimension: Spores 13.54(12.85—14.28) long by 10.1(9.04—11.19) wide and 7.4(6.66—8.09) thick. Larger polar capsule 5.75(5.24—7.14) by 4.27(2.86—4.76); the smaller one, 3.18(2.38—4.76) by 1.3(1.19—2.14).This species resembles Myxobolus anisocapsularis Schulman (1962), but differs from the latter in its spindle-shaped spore, as observed suturally. Its capsules are also dissimilar to those of the known species.8. Myxobolus elliptoides sp. nov. (figs. 29—32)Host: Cyprinus carpio LinnaeusLocation: FinVegetative form: Cyst rounded, oblong or irregular in shape, grayish-white in color, about 1 mm in diameter.Spore: Sub-rounded in front view, three V-shaped folds at posterior end, intercapsular appendix distinct. Spindle-shaped in sutural view. Sutural ridge straight and broad. Two polar capsules pyriform, unequal in size. Sporoplasm with a large and rounded iodinophilous vacuole.Dimension: Spores 14.04—15.95 long by 8.81—10.71 wide and 6.9—7.48 thick. Larger polar capsule 4.28—5.95 by 2.86—3.57; the smaller one, 2.38—3.57 by 1.9—2.62.This new species is similar to Myxobolus gourdiformis Lee et Nie (1965), but differs from the latter by having longer, spindleshaped spore with three V-shaped folds at its posterior end.9. Myxobolus pinna sp. nov. (figs. 33—36)Host: Ctenopharyngodon idellus (C. et V.)Location: FinVegetative form: Cyst in epidermis of fin, rounded or irregular in shape, grayish in color, about 0.5 mm in diameter.Spore: Oval in front view. Fusiform in sutural view. Sutural ridge straight and distinct. Two polar capsules unequal, pyriform. Sporoplasm with a round, large iodinophilous vacuole.Dimension: Spores 14.76—17.14 long by 8.57—10 wide and 7.14—7.62 thick. Larger polar capsule 6.19—7.38 by 4.05—4.76, the smaller one, 2.38—3.09 by 1.67—1.90.The present species is similar to Myxobolus abbottinae Ma et al. (1982), but differs from the latter in having two smaller, pyriform polar capsules.