In Thailand, two species of rhizostome jellyfish, Rhopilema hispidum and Lobonemoides robustus, are commercially harvested. The cnidomes, nematocyst size and toxicities were compared between these species. Rhopilema hispidum and L. robustus each had four types of nematocysts on their oral arms. For R. hispidum, these nematocyst types included two types of isorhiza and two types of rhopaloid, while in L. robustus, there were three types of isorhiza and one type of rhopaloid. For R. hispidum, tubule lengths of the largest nematocyst type (large round isorhiza; mean ± SD = 313.8 ± 62.2 μm) were significantly longer than those of L. robustus (large ellipsoid rhopaloid; 162.1 ± 38.5 μm). Using the freshwater shrimp, Palaemon paucidens, in a bioassay, we determined that the lethal nematocyst concentrations for R. hispidum and L. robustus were 5705.3 ± 1118.1 and 3408.3 ± 1032.9 unit g−1 wet weight, respectively, and that these concentrations were significantly higher in the former than in the latter.

中文翻译：

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泰国两种商业捕捞的根茎水母种类的刺胞菌群和毒性差异

在泰国，有两种根茎水母，糙皮毛茛和粗壮叶骨, 是商业收获的。比较了这些物种之间的刺胞体、刺胞大小和毒性。糙皮毛茛和L. 健壮的每个人的口腔手臂上都有四种类型的刺丝囊。为了R. hispidum，这些刺丝囊类型包括两种类型的异根茎和两种类型的菱形，而在L. 健壮的, 有 3 种异根茎和 1 种 rhopaloid。为了R. hispidum, 最大的刺丝囊类型（大圆形异根茎；平均值 ± SD = 313.8 ± 62.2 μm）的小管长度显着长于L. 健壮的（大椭圆形 rhopaloid；162.1 ± 38.5 μm）。使用淡水虾，鲶鱼，在生物测定中，我们确定致死线虫囊浓度为R. hispidum和L. 健壮的分别为 5705.3 ± 1118.1 和 3408.3 ± 1032.9 单位 g-1湿重，并且这些浓度在前者中显着高于后者。