Characterization of the complete mitochondrial genome of Lysmata vittata (Decapoda: Hippolytidae)

Abstract Lysmata vittata is widely distributed in the Indian and Pacific oceans. In this study, we sequenced the mitochondrial genome of L. vittata using Illumina HiSeq. The complete mitochondrial genome of L. vittata was 20,837 bp in length, including 13 protein-coding genes, 22 transfer RNA genes, and two ribosomal RNA genes. The contents of the four bases in the mitochondrial DNA were A (31.68%), T (32.36%), C (21.65%), and G (14.31%). Phylogenetic analysis of 41 shrimp showed that L. vittata was clustered with other Hippolytidae shrimp.

The red-striped shrimp Lysmata vittata (Decapoda: Hippolytidae) is a popular shrimp in the marine aquarium trade (Marin et al. 2012). It is widely distributed in the Indian and Pacific oceans, including along the coasts of Japan, China, Indonesia, Australia, and eastern Africa (Wang and Sha 2018;Alves et al. 2019). The species is commonly found at depths of 2 to 50 m and lives in large groups among rocks, algae, and sponges (Alves et al. 2019). Research on this species remains limited, although several studies have investigated its mating, larval development, gonadal development, and diet (Yang and Kim 2010;Chen et al. 2019). The complete mitochondrial genome (mitogenome) of L. vittata is an important resource for evolutionary research. In this study, we report on the complete mitogenome of L. vittata and analyze its phylogenetic relationships within Hippolytidae.
The mitogenome of L. vittata was 20,837 bp in length (GenBank accession number: MW285083.1), which is larger than that of other species belonging to the Lysmata genus. This may be due to the 4-kb noncoding sequence between cox1 and cox2 in the L. vittata mitogenome, which is much longer than that of other species of Lysmata. The tRNA-Leu divided this noncoding sequence into two sequences.One was 1712 bp length with A þ T content of 71.67%, and the other was 2270 bp length with A þ T content of 72.82%. The L. vittata mitogenome contained 13 protein-coding, 22 tRNA, and two rRNA genes. Of the 37 genes, 22 were encoded by the heavy strand and 15 genes, including four protein-coding (ND1, ND4, ND4L, and ND5), two rRNA, and nine tRNA genes, were encoded by the light strand. The A, G, C, and T contents of the heavy strand were 34.36%, 11.74%, 17.03%, and 36.87%, respectively, with a high A þ T content of 71.24%. All protein-coding genes had ATN as the start codon. Ten protein-coding genes (ND1, ND2, ND3, ND4L, ND6, Cox2, Cox3, ATP8, ATP6, and Cytb) contained a TAA stop codon, one protein-coding gene (Cox1) contained a TAG stop codon, and two protein-coding genes (ND4 and ND5) contained an incomplete T-stop codon. 16S rRNA and 12S rRNA were 1 467 bp (72.26% AT content) and 821 bp (67.07% AT content) in length, respectively. All tRNA genes ranged from 51 to 77 bp in size.
Based on the 13 complete concatenated protein-coding genes of 41 shrimp from the GenBank database, a phylogenetic tree was constructed using the maximum-likelihood (ML) method and Jones-Taylor-Thornton (JTT) matrix-based model, with a bootstrap of 1 000 replicates (Figure 1). The phylogenetic tree showed that L. vittata was clustered with L.
amboinensis. However, Saron marmoratus and Rhynchocinetes durbanensis were clustered together. This result was similar to the results of previous research (Terossi et al. 2017;Wang et al. 2021), which all proved that Hippolytidae can be considered as a polyphyletic taxon. In conclusion, our study described the complete mitogenome of L. vittata and analyzed its phylogenetic position within Hippolytidae. This research should contribute to further investigations on the molecular evolution and conservation of this species.

Disclosure statement
No potential conflict of interest was reported by the author(s).

Data availability statement
The data that support the findings of this study are openly available in NCBI at https://www.ncbi.nlm.nih.gov/, reference number MW285083.