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Apristurus manocheriani, n. sp., teeth of holotype, A: upper anterior tooth, B: upper lateral tooth, C: lower anterior tooth, D: lower lateral tooth.
Source publication
A new species of catshark, Apristurus manocheriani n. sp., is described from 8 specimens collected from seamounts in the southwest Indian Ocean (SWIO). The new species is placed in the Apristurus spongiceps subgroup and is only the second known species in this subgroup occurring in the western Indian Ocean. Geographically, A. manocheriani is known...
Contexts in source publication
Context 1
... numerous and large (Fig. 3); similar in upper and lower jaw; upper anteriors with long, robust, central cusp, flanked by one or two acutely pointed lateral cusps on each side, less than one-half height of central cusp; upper laterals with long central cusp flanked by two successively smaller cusps on each side, about one-half or less than height of preceding ...
Context 2
... numerous and large (Fig. 3); similar in upper and lower jaw; upper anteriors with long, robust, central cusp, flanked by one or two acutely pointed lateral cusps on each side, less than one-half height of central cusp; upper laterals with long central cusp flanked by two successively smaller cusps on each side, about one-half or less than height of preceding ...
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Citations
... We compiled a list of 545 valid shark species based on both the literature (e.g., Ebert et al., 2021;Weigmann, 2016) and an exhaustive review of recently described species (e.g., Cordova & Ebert, 2021;Ebert & Jang, 2022;Ebert et al., 2021;Fricke et al., 2023;Ito et al., 2022;Long et al., 2021;Weigmann et al., 2023;White et al., 2021White et al., , 2023aWhite et al., , 2023b. The molecular dataset is composed of 16 genes, including 13 mitochondrial coding genes: cytochrome B, cytochrome oxidase 1, 2, and 3, nicotinamide adenine dinucleotide 1, 2, 3, 4, 4L, 5, and 6, ATP synthase subunit 6 and 8, two mitochondrial ribosomal genes: 12S and 16S, and one nuclear coding gene: recombination activating gene 1. ...
Estimating how traits evolved and impacted diversification across the tree of life represents a critical topic in ecology and evolution. Although there has been considerable research in comparative biology, large parts of the tree of life remain underexplored. Sharks are an iconic clade of marine vertebrates, and key components of marine ecosystems since the early Mesozoic. However, few studies have addressed how traits evolved or whether they impacted their extant diversity patterns. Our study aimed to fill this gap by reconstructing the largest time-calibrated species-level phylogeny of sharks and compiling an exhaustive database for ecological (diet, habitat) and biological (reproduction, maximum body length) traits. Using state-of-the-art models of evolution and diversification, we outlined the major character shifts and modes of trait evolution across shark species. We found support for sequential models of trait evolution and estimated a small to medium-sized lecithotrophic and coastal-dwelling most recent common ancestor for extant sharks. However, our exhaustive hidden traits analyses do not support trait-dependent diversification for any examined traits, challenging previous works. This suggests that the role of traits in shaping sharks' diversification dynamics might have been previously overestimated and should motivate future macroevolutionary studies to investigate other drivers of diversification in this clade.
... The anal-fin insertion of the embryo is immediately forward of the ventral caudal-fin origin confirming that this species belongs to the genus Apristurus. The genus Apristurus is the second-most diverse group of sharks and the most diverse genus of oviparous sharks, comprising 40 valid nominal taxa (Cordova & Ebert, 2021;Weigmann, 2016;White et al., 2017). Eight of these species are known to occur in Deng et al., 1983; bigfin catshark Apristurus platyrhynchus (Tanaka, 1909); and freckled catshark Apristurus sinensis Chu & Hu, 1981. ...
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The milk-eye catshark Apristurus nakayai Iglésias, 2012 was known from three specimens in the southwestern Pacific Ocean. Six specimens were recently collected from the South China Sea. It belongs to the brunneus group, and superficially resembles A. platyrhynchus Tanaka, 1909. Apristurus nakayai differs from A. platyrhynchus by the following characters: iris shiny white when fresh; body brownish black to black; second dorsal-fin insertion above or slightly in front of the anal-fin insertion; denticles absent inside mouth; and maturing at about 400 mm TL in both sexes. The occurrence of Apristurus nakayai from the South China Sea represents the first record in the northern Hemisphere, and a substantial distributional range extension (ca. 4665 km).
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