Morphological diversity of sound-producing structures has not been well investigated among members of superorder Peracarida. Presumptive stridulatory sound-producing organs have been reported in some amphipods and tanaidaceans, and sound production by these organs has been documented in two isopod species in Oniscidea and Sphaeromatidea. We describe three presumptive stridulatory organs in the paranthurid isopod Paranthura cf. japonica Richardson, 1909, the first case known in Cymothoida. One type, consisting of a scale-bearing knob on the posterolateral corner of a pereonite and the scale-bearing anterolateral corner of the succeeding pereonite, was found between two pairs of pereonites (1, 2 and 2, 3). A second type involves a serrated structure in the sub-posterolateral region of pereonites 1 and 2, with the sharp anterolateral margins of pereonites 2 and 3 appearing to provide corresponding plectra. The third type involves an extension bearing a pair of serrated structures on the posteroventral margin of pereonites 1 and 2; the anterior-ventrolateral edges of pereonites 2 and 3 appear to provide corresponding plectra. All three organs occurred in both sexes of P. cf. japonica. Our discovery of novel, presumptive stridulatory organs in an intertidal isopod indicates that much remains to be learned about the biology of even common peracarid species.

中文翻译：

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Paranthura 中假定的喘鸣器官 cf。粳稻理查森，1909（等足纲：Cymothoidia：Paranthuridae）

发声结构的形态多样性尚未在 Peracarida 超目成员中得到很好的研究。据报道，一些片脚类动物和 tanaidaceans 中存在假定的鸣声发声器官，并且在 Oniscidea 和 Sphaeromatidea 的两种等足类动物中记录了这些器官的发声器官。我们描述了 parathurid 等足类动物 Paranthura cf. 中的三个假定的喘鸣器官。japonica Richardson，1909 年，在 Cymothoida 中发现的第一例。一种类型，由一个带鳞片的结块组成，位于一个带鳞片的后外侧角和随后的带鳞片的前外侧角，位于两对带鳞片（1, 2 和 2, 3）之间。第二种类型涉及在 pereonites 1 和 2 的亚后外侧区域中的锯齿状结构，pereonites 2 和 3 尖锐的前外侧边缘似乎提供了相应的 plectra。第三种类型涉及在 pereonites 1 和 2 的后腹侧边缘带有一对锯齿状结构的延伸；pereonites 2 和 3 的前腹外侧边缘似乎提供了相应的 plectra。所有三个器官都出现在 P. cf. 的两种性别中。粳稻。我们在潮间带等足类动物中发现了新的、假定的喘鸣器官，这表明即使是常见的鲈形目物种的生物学仍有许多需要了解。所有三个器官都出现在 P. cf. 的两种性别中。粳稻。我们在潮间带等足类动物中发现了新的、假定的喘鸣器官，这表明即使是常见的鲈形目物种的生物学仍有许多需要了解。所有三个器官都出现在 P. cf. 的两种性别中。粳稻。我们在潮间带等足类动物中发现了新的、假定的喘鸣器官，这表明即使是常见的鲈形目物种的生物学仍有许多需要了解。