A new species of Ampithoe (Amphipoda, Ampithoidae) from Korea, with a redescription of A.tarasovi.

An ampithoid species, previously known as A.tarasovi in Korea, is assigned as a new species, A.changbaensis sp. nov. based on the reexamination of the holotype of A.tarasovi. The new species shows different morphological characteristics compared to A.tarasovi, especially in male gnathopods 1 and 2. The type material of A.tarasovi is redescribed and illustrated here and a key to the Korean species of Ampithoe is provided.

The complete mitochondrial genome of Haustorioides koreanus Jo, 1988 (Crustacea: Amphipoda: Dogielinotidae).

The mitochondrial genome of a dogielinotid amphipod, Haustorioides koreanus, was completely sequenced for the first time. The total mitogenome length of H. koreanus was 14,839 bp with 13 protein-coding genes, two ribosomal RNA genes, and 22 transfer RNA genes. The phylogenetic tree confirmed that H. koreanus belongs to the families Hyalellidae in the same clade and to the suborder Senticaudata within Amphipoda. This is the first record of the complete mitochondrial genome sequence of the family Dogielinotidae.

Grandidierella gilesi Chilton, 1921 (Amphipoda, Aoridae), first encounter of non-indigenous amphipod in the Lam Ta Khong River, Nakhon Ratchasima Province, North-eastern Thailand.

The first record of the non-indigenous, alien amphipod Grandidierella gilesi in the Lam Ta Khong River is presented. Previously, this Indo-Pacific amphipod had only been reported in the Indian Ocean, the Andaman Sea, the Gulf of Thailand, the South China Sea and Australia. In Thailand, G. gilesi was previously reported in an isolated pond in Bangkok. The present study constitutes another record of this species in inland water. The characteristics and variation of G. gilesi, observed in this study, are also discussed. All the specimens described here are preserved at the Princess Maha Chakri Sirindhorn Natural History Museum, Prince of Songkla University, Songkla, Thailand.

The complete mitochondrial genome of Undinula vulgaris (Dana, 1849) (Crustacea: Calanoida: Calanidae).

The present study reports, for the first time, the complete mitochondrial genome (mitogenome) of Undinula vulgaris. The total mitogenome length of U. vulgaris was 15,303 bp with 13 protein-coding genes (PCGs), 2 ribosomal RNAs (rRNAs), 22 transfer RNAs (tRNAs), and 1 non-coding region. Phylogenetic analysis showed that U. vulgaris belonged to the same family. This is the second report of the complete mitogenome sequence of the family Calanidae.

The complete mitochondrial genome of a marbled eelpout Lycodes raridens (Perciformes: Zoarcidae).

In this study, the complete mitochondrial genome of the marbled eelpout, Lycodes raridens Taranetz & Andriashev, 1937 was sequenced using the primer walking method. The mitogenome was 16,569 bp in length and encoded with 13 protein-coding genes, 22 transfer RNA genes, two ribosomal RNA genes, and one Non-Coding Region. The overall nucleotide composition of L. raridens is 25.5%, 25.3%, 18.7%, and 30.5% for A, T, G, and C, respectively. Phylogenetic analysis using the ML method showed that L. raridens was clustered into one branch with L. ygreknotatus and L. toyamensis.

Discovery of a new genus and species of dogielinotid amphipod (Crustacea: Amphipoda: Dogielinotidae) from the Nipa palm in Thailand, with an updated key to the genera.

During a scientific survey, a new genus of the dogielinotid amphipoda was found in the Nipa palm (Nypa fruticans) in Bang Krachao Urban Oasis, Samut Prakan Province, Thailand. We placed this new genus, Allorchestoides gen. nov., within the family Dogielinotidae. The new taxa can be easily distinguished from the remaining genera by differences in the incisor of the left and right mandibles, apical robust setae of the maxilla 1, and the large coxa and strong obtuse palm in the female gnathopod 1. The type species of Allorchestoides gen. nov., Allorchestoides rosea n. sp., is described here in, with an updated key to the genera of the family Dogielinotidae.

Determination of complete mitogenome sequence for Eastern Asian population of Cheilonereis cyclurus (Harrington, 1897) (Polychaeta: Nereididae).

Complete mitogenome sequence for eastern Asian population of Cheilonereis cyclurus (Polychaeta: Nereididae) was determined for the first time. The length of circular genome of C. cyclurus is 14,917 bp including 13 protein-coding genes, two rRNA genes, 22 tRNA genes, and a non-coding region of 383 bp. The gene order of C. cyclurus is identical to that of the following four nereidid species: Hediste diadroma, Namalycastis abiuma, Paraleonnates uschakovi, Tylorrhynchus heterochaetus. The phylogenetic position of C. cyclurus compared to 16 selected polychaetes was conducted and present species is closely related to the clade containing Perinereis nuntia, P. aibuhitensis, and Platynereis dumerilii with high bootstrap value.

The complete mitochondrial genome of Echinoecus nipponicus Miyake, 1939 (Crustacea: Decapoda: Pilumnidae), a symbiont of sea urchins.

The mitochondrial genome of a crab symbiotic with sea urchins, Echinoecus nipponicus, was completely sequenced for the first time. The total mitogenome length of E. nipponicus was 16,173 bp including 13 protein-coding genes, 2 rRNA genes, and 22 tRNA genes. The phylogenetic tree confirmed that E. nipponicus belonged to the subsection Heterotremata within Brachyura. This is the first record of the complete mitogenome for the subfamily Eumedoninae.