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The family Myctophidae plays a crucial role in marine pelagic fish communities. Ceratoscopelus townsendi, as a member of the genus Ceratoscopelus, is an important food source for numerous oceanic economic fish. It also serves as a biological pump connecting the upper and lower ocean layers, playing a key role in the active oceanic carbon cycle and food web of the Northwest Pacific. However, genomic research on this species is limited. To enrich the Myctophidae genomic database and improve species identification accuracy, we sequenced, assembled, and annotated the complete C. townsendi mitochondrial genome and conducted a phylogenetic analysis. The results showed that the total mitochondrial genome length was 17780 bp, containing 37 coding genes and 1 non-coding region. These genes were distributed across light (L) and heavy (H) strands, with gene overlaps and intergenic regions. Its genome structure was consistent with that of other Myctophidae species. Base composition analysis revealed an AT bias, with the top five most frequent codons being CCC (P), CCU (P), CUC (L), CUU (L), and CAC (H). The total length of protein-coding genes accounted for 57.9% of the genome, with codon usage preferences and distinct base biases across genes. tRNA genes were distributed on both H and L strands, with some duplications, while rRNA genes occupied specific regions with characteristic base compositions. Ka/Ks ratios of 13 protein-coding genes in the mitochondrial genomes of Myctophidae were all lower than 1, indicating purifying selection. Phylogenetic analysis showed that C. townsendi clustered closely with C. maderensis and was closely related to Bolinichthys, thereby clarifying its phylogenetic position within Myctophidae. This study enriches mitochondrial genomic information for Myctophidae, providing important data to support future research on species identification, phylogenetics, and biodiversity within this family.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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