The complete mitochondrial genome sequence of <i>Praxillella</i> sp.: insights into phylogenetic relationships within Maldanidae

Gong Xiaopeng; Duan Chen; Ye Yingying; Chen Yongjiu

doi:10.12284/hyxb2026002

Volume 48 Issue 1

Jan. 2026

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Gong Xiaopeng，Duan Chen，Ye Yingying, et al. The complete mitochondrial genome sequence of Praxillella sp.: insights into phylogenetic relationships within Maldanidae[J]. Haiyang Xuebao，2026, 48(1)：97–108 doi: 10.12284/hyxb2026002

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Gong Xiaopeng，Duan Chen，Ye Yingying, et al. The complete mitochondrial genome sequence of Praxillella sp.: insights into phylogenetic relationships within Maldanidae[J]. Haiyang Xuebao，2026, 48(1)：97–108 doi: 10.12284/hyxb2026002

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The complete mitochondrial genome sequence of Praxillella sp.: insights into phylogenetic relationships within Maldanidae

doi: 10.12284/hyxb2026002

1.
Marine Science and Technology College, Zhejiang Ocean University, Zhoushan 316022, China
2.
National Engineering Research Center For Marine Aquaculture, Zhejiang Ocean University, Zhoushan 316022, China

Received Date: 2025-07-29
Rev Recd Date: 2025-10-24
Publish Date: 2026-01-25

Abstract

Abstract

Species of the family Maldanidae are widely distributed across various marine environments, ranging from shallow to deep-sea habitats. However, due to the fragility of their bodies during collection, obtaining intact specimens is often uneasy, and morphological research is difficult to conduct fully. As a result, there are differing viewpoints and ongoing debates among researchers regarding their taxonomic classification. To clarify the evolutionary relationships within Maldanidae, this study assembled and analyzed the complete mitochondrial genome (mitogenome) of Praxillella sp. using second-generation genome sequencing data. The mitogenome of Praxillella sp. is 15539 bp in length, with a base composition of A (33.7%), T (32.6%), G (13.6%), and C (20%), showing a pronounced AT bias. Similar to most metazoans, the genome contains 13 protein-coding genes (PCGs), 22 tRNA genes (including a duplicated tRNA-M), two rRNA genes, and a control region (CR). The codon usage is mainly driven by natural selection. The topological structures of the ML tree and the Bayesian tree constructed based on 13 PCGs are almost all consistent, but the position of P. praetermissa within the subfamily Euclymeninae being uncertain. Phylogeny based on the 13 PCGs overall supports the monophyly of Maldaninae, in contrast, no monophyletic clade is formed within Euclymeninae, being paraphyletic with Nicomachinae, Among the 14 analyzed Maldanid species, four types of gene order are identified, three of which involve changes in tRNA arrangements, driven by tandem duplication and random loss mechanisms. The results offer novel insights into in clarification of taxonomy and phylogenetic relationships of Praxillella sp. in Maldanidae.
- Praxillella sp.,
- Maldanidae,
- mitogenome,
- gene rearrangement,
- phylogenetic relationships

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References(54)

References

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