In this study, we determined the mitogenome sequence of Neomysis japonica (Crustacea, Malacostraca, Mysida), which is the first complete mitogenome sequence in the order Mysida. The mitogenome of N. japonica is 17,652 bp in length and contains 13 protein-coding genes (PCGs), 22 transfer RNAs (tRNAs), 2 ribosomal RNAs (rRNAs), and a control region (CR). Mitogenome analysis of N. japonica revealed a novel gene order that included inversions in three PCGs and five tRNAs, compared with H. americanus, the ancestral pancrustacean ground pattern. The results will be useful for the detailed study of mitogenome evolution and the phylogenetic relationships among the orders in the class Malacostraca. As seen from the phylogenetic tree, N. japonica belongs to the order Mysida within Malacostraca.

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Paranebalia longipes (Willemoes-Suhm, 1875) is cosmopolitan and has been usually found in the algal and sponge debris on the sandy mud substrates. This species can be clearly distinguished from other species of Paranebalia by the presence of serration on posterior margin of pleopods, the number of articles on antennule and antenna, and number of teeth on flange of antennule fourth article. The genus Paranebalia is new to Korea. In this paper, we provide detail descriptions of the diagnostic characteristics and illustrations of the P. longipes. Additionally, type locality and world distribution of the genus Paranebalia are provided.

Nebalia dolsandoensis sp. nov. (Malacostraca: Phyllocarida: Leptostraca), is described from specimens taken from light traps in harbours with organic-rich muddy sand and seaweeds along the south coast of Korea. The new species is characterized based on the following unique combination of characteristics: an antennular flagellum with up to only nine articles in the mature female; the fourth article of the antennule has up to four distal spine-like setae; pleonites 3–7 have rounded denticles along the posterior dorsal margins; the protopod of pleopod 4 has an even posterior margin; the uropods are distinctly short, about 0.6 times as long as pleonite 7 and the anal somite combined; the anal plates have a noticeably broad lateral ‘shoulder’. In addition, a key to the species of the genus Nebalia Leach, 1814 and partial sequences of the mitochondrial cytochrome c oxidase subunit 1 (CO1) gene from the new species are provided.