The complete mitochondrial genome of the deep-water cartilaginous fish Hydrolagus affinis (de Brito Capello, 1868) (Holocephali: Chimaeridae)

Abstract

Cartilaginous fishes are a highly vulnerable vertebrate group but remain poorly studied, especially those occupying deep-water ecological niches. Here, we describe the complete mitogenome of the deep-water chimaeriform Hydrolagus affinis (de Brito Capello, 1868) (Holocephali: Chimaeridae). The mitogenome has 19,437 nucleotides and the same overall content, i.e. 13 protein-coding genes, 22 transfer RNA, 2 ribosomal RNA genes, as available for all cartilaginous fishes mitogenomes. Phylogenetic reconstructions including 615 cartilaginous fishes mitogenomes place the H. affinis within the family Chimaeridae but suggest that Hydrolagus and Chimera are not reciprocally monophyletic, highlighting the need for additional molecular data to improve phylogenetic reconstruction.

Shedding light on the Chimaeridae taxonomy: the complete mitochondrial genome of the cartilaginous fish Hydrolagus mirabilis (Collett, 1904) (Holocephali: Chimaeridae)

“…The paraphyletic status of Hydrolagus and Chimaera was also recovered, as recently reported by Gomes-dos-Santos et al. ( 2020 ). The newly sequenced H. mirabilis mitogenome ranges in the percentage of sequence divergence from 12.8% (unc p -distance) from H. affinis to 15.4% from H. lemures .…”

“…Mitogenomes have been a powerful tool used to elucidate phylogenetic relationships, both at deep and at shallow evolutionary nodes (e.g. Inoue et al 2010;Gomes-dos-Santos et al 2020).…”

A mitochondrial genome assembly of the opal chimaera, Chimaera opalescens Luchetti, Iglésias et Sellos 2011, using PacBio HiFi long reads

“…However, as previously observed (Gomes-dos-Santos et al. 2020 , 2021 ), neither Hydrolagus nor Chimera genera were recovered as monophyletic, which highlights the importance of revising the taxonomy. Indeed, previous authors had already suggested that the distinction between Chimera and Hydrolagus based on the presence or absence of a notch separating the anal from the caudal fin, respectively, needed revision (Didier et al.…”

Complete mitochondrial genome of Hydrolagus mitsukurii (Jordan & Snyder, 1904)

“…The recent studies revealed the paraphyletic status of the genus Hydrolagus and Chimera (Gomes-dos-Santos et al. 2020 ; Gomes-dos-Santos et al. 2021 ; Vilas-Arrondo et al.…”