We collected an undescribed laophontid copepod from a coarse sand habitat on the east coast of Korea and named it Quinquelaophonte enormis sp. nov. We compared the detailed morphological characteristics of the new species with those of congeneric species. Among them, the new species shows a superficial resemblance to the Californian species Quinquelaophonte longifurcata Lang, 1965. However, the two species are easily distinguishable by the setation of the syncoxa on the maxilliped and the fourth swimming leg. The new species has the variable setation on the second to fourth swimming legs. The variations appear among individuals or between the left and right rami of a pair of legs in a single specimen. Although complex chaetotaxical polymorphism occur in this new species, we used myCOI and Cytb to confirm that the new species is not a species complex. Also, partial sequences of 18S and 28S ribosomal RNA genes were used to analyze the position of the new species within the family Laophontidae. The new speciesis the fourteenth Quinquelaophonte species in the world and the second species in Korea.

中文翻译：

---

Quinquelaophonte enormis sp. 11月，一种来自韩国的新型间质桡足类（Harpacticoida：Laophontidae）

我们从韩国东海岸的粗沙栖息地收集了一种未描述的 laophontid 桡足类动物，并将其命名为 Quinquelaophonte enormis sp。十一月 我们比较了新物种与同类物种的详细形态特征。其中，新种表现出与加利福尼亚物种 Quinquelaophonte longifurcata Lang，1965 年的表面相似。然而，这两个物种很容易通过上颌骨和第四游动腿上的同步点来区分。新物种在第二到第四游泳腿上具有可变的设置。变异出现在个体之间或单个标本中一对腿的左右支之间。尽管在这个新物种中出现了复杂的趋向性多态性，我们使用 myCOI 和 Cytb 来确认新物种不是物种复合体。此外，还使用 ​​18S 和 28S 核糖体 RNA 基因的部分序列来分析新物种在老凤蝶科中的位置。该新种为世界第14种、韩国第2种。