A new species of <Emphasis Type="Italic">Penopus</Emphasis> (Teleostei: Ophidiidae) from the Ryukyu Trench,the West Pacific,with remarks on <Emphasis Type="Italic">Penopus microphthalmus</Emphasis> |
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Authors: | Jørgen G Nielsen Shinpei Ohashi |
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Institution: | (1) Natural History Museum of Denmark, Universitetsparken 15, 2100 Copenhagen, Denmark;(2) Chair of Marine Biology and Biodiversity (Systematic Ichthyology), Graduate School of Fisheries Sciences, Hokkaido University, 3-1-1 Minato-cho, Hakodate Hokkaido, 041-8611, Japan |
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Abstract: | The bathyal genus Penopus (Ophidiidae) is revised based on 23 specimens. One specimen from the Ryukyu Trench represents a new species, Penopus
japonicus. The remaining 22 specimens were found on both sides of the Atlantic Ocean, and neither 28 meristic and morphometric characters
nor several morphological characters show any differences between the two populations. This supports Séret (1988), who considered Penopus macdonaldi Goode and Bean 1896 a junior synonym of Penopus microphthalmus (Vaillant 1888). The new Japanese species can be separated from the Atlantic species by having fewer rays in the dorsal (117 vs. 135–158)
and anal (89 vs. 106–122) fins, the squamation of the head restricted to the middle part of the preopercle versus the squamation
covering the dorsum, preopercle and the opercle in part, a distinct spine behind the posterior nostril versus the spine hardly
visible and 9 spines on the hind margin of the preopercle versus 4–7 spines. |
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Keywords: | |
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