Species Diversity
Online ISSN : 2189-7301
Print ISSN : 1342-1670
First Pacific Record of the Rare Scaleless Dragonfish Grammatostomias circularis (Teleostei: Stomiiformes: Stomiidae) from the Ogasawara Islands, Japan
Kota Obata Hisashi Imamura
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JOURNAL OPEN ACCESS

2024 Volume 29 Issue 1 Pages 73-79

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Abstract

A single specimen of a scaleless dragonfish in the genus Grammatostomias Goode and Bean, 1896 (Teleostei: Stomiiformes: Stomiidae) was collected off the Ogasawara Islands, Japan at a depth between 40–780 m. The specimen conformed to G. circularis Morrow, 1959 in having the following characters: dorsal-fin rays 21; anal-fin rays 23; pectoral-fin rays 9; the first pectoral-fin ray not isolated; and entire luminous loop on lateral body surface very thin, almost circular and without zigzags. The likelihood of the distribution pattern of small areas of luminous tissue on the head being diagnostic for each species of Grammatostomias is briefly considered. Grammatostomias circularis has previously been recorded only from the Atlantic, the present specimen representing the first record of the species from the Pacific Ocean, and first record of a species of Grammatostomias from Japan.

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© 2024 The Japanese Society of Systematic Zoology. This is an open access article distributed under a Creative Commons Attribution 4.0 License (CC BY, https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium or format, provided the original work is properly cited. The contents of this article are licensed under the CC BY 4.0, unless indicated otherwise in a credit line to the material.

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