The mitogenome sequence of sea slug, Chromodoris orientalis (Nudibranchia, Chromodorididae), has been decoded for the first time by coverage genome sequencing method. The overall base composition of C. orientalis mitogenome is 30.5% for A, 14.7% for C, 18.0% for G and 36.9% for T, and has low GC content 32.6%. The assembled mitogenome, consisting of 14,266 bp, has unique 13 protein-coding genes, 22 transfer RNAs, and two ribosomal RNAs genes. The C. orientalis mitogenome has the common mitogenome gene order and feature of Nudipleura (a clade of sea slugs and sea snails). The complete mitogenome of C. orientalis provides essential and important DNA molecular data for further phylogenetic and evolutionary analysis for sea slugs and sea snails.

The mitogenome sequence of Halichondria sp. was determined for the first time in this study. Specimens were identified as a new species belonging to genus Halichondria and more detailed taxonomic study is ongoing. Circular complete mitogenome is 19,687 bp in length, containing 14 proteincoding genes (PCGs), 2 ribosomal RNAs (rRNAs), and 25 transfer RNAs (tRNAs). Nucleotide composition of mitogenome consists of 28.9% A, 15.1% C, 21.9% G, 34.1% T, revealing high content of A þ T similar to the other Suberitid sponges. Results will be useful for inferring phylogenetic relationships among the members of Halichondriid.

(2017) The complete mitochondrial genome of sponge Halichondria okadai (Demospongiae, Suberitida, Halichondriidae) from Korea water, Mitochondrial DNA Part B, 2:2, 873-874,

The mitogenome of Pseudosuberites sp. (Suberitida, Suberitidae) has been determined first in the genus Pseudosuberites . Assembled mitogenome was 23,502 bp in length, including 14 protein-coding genes, 25 transfer RNA, and 2 ribosomal RNA genes. The order and structure are the same as those of other species belonging to the same family Suberitidae. Pseudosuberites sp. was clustered with Suberites domucula within the family Suberitidae. The mitogenome of Pseudosuberites sp. will be valuable for inferring phylogenetic relationships among members of suberitids.