Arcturidae Dana, 1849

Kim, Sung Hoon & Yoon, Seong Myeong, 2021, Four new species of isopods (Crustacea, Isopoda) from South Korea, ZooKeys 1010, pp. 133-164 : 133

Family Arcturidae Dana, 1849

Diagnosis

(modified after Poore 2001b). Body moderately cylindrical, geniculate between pereonites IV and V, occasionally straight; cephalon and fused pereonite I expanded ventrolaterally; pereonite IV at least 1.5 × longer than pereonite III; pleonites and pleotelson fused. Pereopod I gnathopod-like, immersed in lateral view by lateral plates of cephalon and pereonite I; pereopods II-IV slender, setose, directed anteriorly; pereopods V-VII ambulatory. Pleopod I, protopod elongated, much longer than wide; exopod of male with lateral excavation, and either a tuft of fine setae, long plumose setae, or both. Uropod biramous; endopod much smaller than exopod.

Remarks.

Classification of the genera of Arcturidae had difficult because many genera were inadequately and ambiguously described ( Kussakin 1972; King 2003b). To resolve this problem, Kussakin (1972) suggested using the structure of pereopods I-IV to diagnose genera and presented a key based on these features to eight Arctic and boreal genera. Since then Poore (2001b) transferred Antarcturus zur Strassen, 1903 and related genera Antarcturidae Poore, 2001. Parapleuroprion Kussakin, 1972 is now synonym of Arcturus Latreille, 1829 ( Boyko et al. 2008d). Arcturella G. O. Sars, 1897 is synonym of Astacilla Cordiner, 1793 ( Kensley et al. 2007; Rincón et al. 2018). Here we submit the key to all genera of Arcturidae .