本实验利用现行主流分类衍征,重新对荆州碘泡虫(Myxobolus kinchowensis)进行了详细描述,其分类特征如下:包囊圆形,寄生于鲫肌肉与肾脏,肌肉包囊大小(126.7±1.8)μm,肾脏包囊直径为94.2μm;两寄生部位各形态参数无显著差异,成熟孢...本实验利用现行主流分类衍征,重新对荆州碘泡虫(Myxobolus kinchowensis)进行了详细描述,其分类特征如下:包囊圆形,寄生于鲫肌肉与肾脏,肌肉包囊大小(126.7±1.8)μm,肾脏包囊直径为94.2μm;两寄生部位各形态参数无显著差异,成熟孢子正面观呈梨形,缝面观呈纺锤形,含一大一小两梨形极囊;无明显囊间突起,孢子后端无褶皱,无粘液膜。组织病理显示在两寄生部位均未引起严重的炎性反应,且感染强度不高,推测该种对宿主无显著影响。基于18S r DNA进化分析发现荆州碘泡虫与寄生在肌肉部位的碘泡虫属种类聚为一个大枝,然后该大枝又根据地理位置远近分为北美枝、欧洲枝以及亚洲枝。通过形态比较研究以及分子分析可确定荆州碘泡虫为有效种,其寄主为鲫,寄生部位为肌纤维间和肾小囊。此外,两组织差异明显的寄生部位出现说明荆州碘泡虫相应的放射孢子虫在宿主鲫体内存在不同的发育与移行途径,而肌肉可能为其常规寄生部位,肾脏为其异常寄生部位,这种寄生部位的转移与宿主转变可能是粘孢子虫物种多样性形成的机制。展开更多
The present paper deals with a new species of the genus Myxobolus parasitizing the fish ( Carassius auratus auratus) in Beibei, Chongqing, China. Type specimens are deposited in College of Life Sciences, Southwest Chi...The present paper deals with a new species of the genus Myxobolus parasitizing the fish ( Carassius auratus auratus) in Beibei, Chongqing, China. Type specimens are deposited in College of Life Sciences, Southwest China Normal University. All measurements are in microns. Myxobolus beibeiensis sp. nov. (Figs. 1—4) Host\ Carassius auratus auratus (Linnaeus). Location\ gill. Locality\ Beibei (29°49′ N, 106°25′ E),Chongqing. Date\ Aug. 16, 1996. Vegetative form is not being observed. Spore in shape of pumpkin seed in thecal view, with blunt and rounded posterior end, tapering to anterior extremity, with widest part in field from half level to anterior two-thirds level of body, and with 3—4 small V shaped folds on posterior part in some spores; convex lens shaped in sutural view, sutural ridge distinct and straight; two short rod like polar capsules not equal in size, with a triangular or round nucleus behind them, and their anterior extremities not on the same level, larger polar capsule occupying two-fifths of spore length; sporoplasm concentrated, with two round germinal nuclei and an iodinophilous vacuole. Dimensions of spores preserved in formalin (5% in Concentration): length 17.2 (16.0—19.1), width 11.5(10.2—13.0), thickness 8.0(7.1—9.5); larger polar capsules 8.8(8.2—9.7) by 3.3(3.2-3.4), smaller polar capsules 7.8(7.5—8.0) by 3.0(2.8? ?.2). This species is similar to Myxobolus tayehensis Chen, 1998, but differs from the latter in following respects: (1) spores of the new species are in the shape of pumpkin seed in thecal view, while spores of M. tayehensis are pyriform or bulb shaped; (2) the two polar capsules of the new species are not equal in size, and the larger one occupies two fifths of the spore length, while those of M. Tayehensis are equal in size, and occuping one half of spore. This species also resembles M. orientalis Schulman, 1962, but differs from the latter in two respects. (1) Spore length of the new species in about one and half times as long as spore width, while that o展开更多
文摘本实验利用现行主流分类衍征,重新对荆州碘泡虫(Myxobolus kinchowensis)进行了详细描述,其分类特征如下:包囊圆形,寄生于鲫肌肉与肾脏,肌肉包囊大小(126.7±1.8)μm,肾脏包囊直径为94.2μm;两寄生部位各形态参数无显著差异,成熟孢子正面观呈梨形,缝面观呈纺锤形,含一大一小两梨形极囊;无明显囊间突起,孢子后端无褶皱,无粘液膜。组织病理显示在两寄生部位均未引起严重的炎性反应,且感染强度不高,推测该种对宿主无显著影响。基于18S r DNA进化分析发现荆州碘泡虫与寄生在肌肉部位的碘泡虫属种类聚为一个大枝,然后该大枝又根据地理位置远近分为北美枝、欧洲枝以及亚洲枝。通过形态比较研究以及分子分析可确定荆州碘泡虫为有效种,其寄主为鲫,寄生部位为肌纤维间和肾小囊。此外,两组织差异明显的寄生部位出现说明荆州碘泡虫相应的放射孢子虫在宿主鲫体内存在不同的发育与移行途径,而肌肉可能为其常规寄生部位,肾脏为其异常寄生部位,这种寄生部位的转移与宿主转变可能是粘孢子虫物种多样性形成的机制。
文摘The present paper deals with a new species of the genus Myxobolus parasitizing the fish ( Carassius auratus auratus) in Beibei, Chongqing, China. Type specimens are deposited in College of Life Sciences, Southwest China Normal University. All measurements are in microns. Myxobolus beibeiensis sp. nov. (Figs. 1—4) Host\ Carassius auratus auratus (Linnaeus). Location\ gill. Locality\ Beibei (29°49′ N, 106°25′ E),Chongqing. Date\ Aug. 16, 1996. Vegetative form is not being observed. Spore in shape of pumpkin seed in thecal view, with blunt and rounded posterior end, tapering to anterior extremity, with widest part in field from half level to anterior two-thirds level of body, and with 3—4 small V shaped folds on posterior part in some spores; convex lens shaped in sutural view, sutural ridge distinct and straight; two short rod like polar capsules not equal in size, with a triangular or round nucleus behind them, and their anterior extremities not on the same level, larger polar capsule occupying two-fifths of spore length; sporoplasm concentrated, with two round germinal nuclei and an iodinophilous vacuole. Dimensions of spores preserved in formalin (5% in Concentration): length 17.2 (16.0—19.1), width 11.5(10.2—13.0), thickness 8.0(7.1—9.5); larger polar capsules 8.8(8.2—9.7) by 3.3(3.2-3.4), smaller polar capsules 7.8(7.5—8.0) by 3.0(2.8? ?.2). This species is similar to Myxobolus tayehensis Chen, 1998, but differs from the latter in following respects: (1) spores of the new species are in the shape of pumpkin seed in thecal view, while spores of M. tayehensis are pyriform or bulb shaped; (2) the two polar capsules of the new species are not equal in size, and the larger one occupies two fifths of the spore length, while those of M. Tayehensis are equal in size, and occuping one half of spore. This species also resembles M. orientalis Schulman, 1962, but differs from the latter in two respects. (1) Spore length of the new species in about one and half times as long as spore width, while that o
