Four new isopods, Amakusanthura intermediasp. nov., Apanthura laevipedatasp. nov., Idarcturus trispinosussp. nov., and Neastacilla paralongipectussp. nov., are reported from the sublittoral zones in Korean waters. Amakusanthura intermediasp. nov. differs from its congeners by the following features: the uropodal exopod is sinuous distally and with pointed apex; the maxillipedal endite is present and reaching to the distal end of fused palp articles I and II; and the propodal palm of pereopod I is stepped. Apanthura laevipedatasp. nov. can be distinguishable from its related species by the following characteristics: the eye is lacking; the propodal palm of pereopod I is not stepped; and the uropodal exopod is not sinuous. Idarcturus trispinosussp. nov. is diagnosed by the following features: the cephalon has three dorsal spines and a pair of lateral spines; pereonite IV has two pairs of small dorsolateral spines, four pairs of dorsal spines, and one posterior spine; and the pleotelson has three pairs of wings laterally. Neastacilla paralongipectussp. nov. can be distinguished by the following characteristics: the body is smooth and lacking dorsal spines or tubercles; pereonite IV is approximately 5.4× longer than pereonites II and III together; and the pleotelson has two pairs of lateral wings. In this paper, detailed descriptions and illustrations of the four species are presented. A key to the genera of the family Arcturidae and keys to the species of the four genera are also provided.

中文翻译：

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来自韩国的四种新的等足类动物（甲壳纲，等足类）

四个新的等足动物Amakusanthura intermediasp。11月，Apanthura laevipedatasp。11月，Idarcturus trispinosussp。十一月，和Neastacilla paralongipectussp。据报道，来自韩国水域的沿海沿岸地区。Amakusanthura intermediasp。十一月 与同类动物的区别在于以下特征：尾足外突向远端弯曲且具有尖尖；存在最大足端的白蚁，并到达融合的纸浆物品I和II的远端；脚架我的脚掌被踩下。Apanthura laevipedatasp。十一月 可以通过以下特征与相关物种区别开：眼睛缺乏；我没有踩过脚足类动物的掌掌；尾足外足不弯曲。Idarcturus trispinosussp。十一月 通过以下功能诊断：头部有三个背棘和一对侧棘。钙霞石IV具有两对小背棘，四对背棘和一个后棘。褶皱侧面有三对翼。Neastacilla paralongipectussp。十一月 具有以下特征：身体光滑，没有背脊或结节；钙橄榄石IV比钙橄榄石II和III长约5.4倍；褶皱有两对侧翼。在本文中，对这四个物种进行了详细的描述和说明。还提供了Arcturidae科的一个属的钥匙以及这四个属的一个种类的钥匙。褶皱侧面有三对翼。Neastacilla paralongipectussp。十一月 具有以下特征：身体光滑，没有背脊或结节；钙橄榄石IV比钙橄榄石II和III长约5.4倍；褶皱有两对侧翼。在本文中，对这四个物种进行了详细的描述和说明。还提供了Arcturidae科的一个属的钥匙以及这四个属的一个种类的钥匙。褶皱侧面有三对翼。Neastacilla paralongipectussp。十一月 具有以下特征：身体光滑，没有背脊或结节；钙橄榄石IV比钙橄榄石II和III长约5.4倍；褶皱有两对侧翼。在本文中，对这四个物种进行了详细的描述和说明。还提供了Arcturidae科的一个属的钥匙以及这四个属的一个种类的钥匙。介绍了这四个物种的详细说明和插图。还提供了Arcturidae科的一个属的钥匙以及这四个属的一个种类的钥匙。介绍了这四个物种的详细说明和插图。还提供了Arcturidae科的一个属的钥匙以及这四个属的一个种类的钥匙。