Moon Seong Yong, Youn Seok-Hyun, Venmathi Maran B A
Fisheries and Ocean Information Division, National Fisheries Research & Development Institute, Busan 619-705, Korea.
Marine Ecosystem Research Division, Korea Institute of Ocean Science & Technology, P. O., Box 29, Ansan, Seoul 425-600, Korea.
Zookeys. 2015 Apr 8(495):21-40. doi: 10.3897/zookeys.495.7862. eCollection 2015.
Two new species of benthopelagic copepods of the genus Stephos T. Scott, 1892, belonging to the family Stephidae G.O. Sars, 1902, are described based on specimens collected in the stagnant water flooding the burrows excavated by ocypodid crabs in two intertidal mud-flats, and from near-bottom shallow waters in Korea, respectively. They can be easily diagnosed based on the ornamentation of both the female genital double-somite and genital operculum; the morphology of the distal segment of the male right P5; the presence/absence of a tiny pointed process on the distomedial angle of second segment of female P5; and the condition (seta or spine) of the lateral armature element on the distal segment of female fifth legs, among other features. This is one of the few cases reported of calanoid copepods living as commensals of other invertebrates, and raises to six the number of members of the genus reported from Asia. This is also the first record of the family Stephidae in Korea.
基于分别在韩国两个潮间带泥滩中穴居蟹挖掘洞穴内的积水以及近底层浅水区采集的标本，描述了1892年由T. 斯科特建立的斯蒂芬哲水蚤属（Stephos）的两种新的底栖浮游桡足类动物，它们隶属于1902年由G.O. 萨斯建立的斯蒂芬哲水蚤科（Stephidae）。根据雌性生殖双节片和生殖盖的纹饰、雄性右第五胸足末节的形态、雌性第五胸足第二节远端内角上微小尖突的有无以及雌性第五胸足末节外侧武装元件的状况（刚毛或刺）等特征，可轻松对它们进行鉴别。这是所报道的少数几例哲水蚤类桡足动物作为其他无脊椎动物共栖者的情况之一，使亚洲已报道的该属成员数量增至六个。这也是斯蒂芬哲水蚤科在韩国的首次记录。
