Opistognathus ctenion, Japanese whitespotted jawfish

Opistognathus ctenion Fujiwara, Motomura & Shinohara, 2023

Japanese whitespotted jawfish
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Classification / Names Common names | Synonyms | Catalog of Fishes(genus, species) | ITIS | CoL | WoRMS | Cloffa

Teleostei (teleosts) > Ovalentaria/misc (Various families in series Ovalentaria) > Opistognathidae (Jawfishes)
Etymology: Opistognathus: Greek, opisthe = behind + Greek, gnathos = jaw (Ref. 45335); to the very elongate upper jaw of the type species of the genus, Opistognathus nigromarginatus (Ref. 128653); ctenion: Name 'ctenion' from the Greek diminutive meaning 'small comb', in reference to the low gill raker numbers in the new species, one of the lowest recorded for Indo-Pacific species of Opistognathus.

Environment: milieu / climate zone / depth range / distribution range Ecology

Marine; demersal; depth range 35 - 37 m (Ref. 129318). Subtropical

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Northwest Pacific: Japan.

Size / Weight / Age

Maturity: Lm ?  range ? - ? cm
Max length : 3.1 cm SL male/unsexed; (Ref. 129318)

Short description Identification keys | Morphology | Morphometrics

Dorsal spines (total): 11; Dorsal soft rays (total): 16; Anal spines: 2; Anal soft rays: 17; Vertebrae: 32. This species is distinguished from its congeners by the following set of characters: posterior end of upper jaw rigid, without flexible lamina; D XI, 16-18; anterior dorsal-fin spines very stout and straight, and their distal ends not transversely forked; A II, 17; gill rakers 6 or 7 + 13 or 14 = 20 or 21; vertebrae 10 + 22 = 32; longitudinal scale rows c. 40-50; lateral line terminating below 4th-6th soft ray of dorsal fin; 4th and 5th mandibular pore positions usually included 2 and 6-7 pores, respectively; absence of body scales anterior to vertical below 4th or 5th dorsal-fin spine; vomerine teeth 2; body reddish-brown with 3 or 4 longitudinal rows of c. 8-10 whitish blotches; cheek and opercle with 5 or 6 whitish blotches; snout, suborbital region, and both jaws without blotches or stripes; spinous dorsal fin with ocellus between 2nd to 5th spines; dorsal-fin soft-rayed portion with two reddish-orange stripes; pectoral-fin base with 1 or 2 whitish blotches; and caudal fin uniformly faint orange or reddish-yellow (Ref. 129318).
Body shape (shape guide): elongated; Cross section: compressed.

Biology     Glossary (e.g. epibenthic)

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Main reference Upload your references | References | Coordinator | Collaborators

Fujiwara, K., H. Motomura and G. Shinohara, 2023. Opistognathus ctenion (Perciformes, Opistognathidae): a new jawfish from southern Japan. ZooKeys 1179:353-364. (Ref. 129318)

IUCN Red List Status (Ref. 130435: Version 2025-2)

  Data deficient (DD) ; Date assessed: 17 September 2024

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans

  Harmless





Human uses

Fisheries: of no interest
FAO - Publication: search | FishSource |

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Internet sources

AFORO (otoliths) | Aquatic Commons | BHL | Cloffa | Websites from users | Check FishWatcher | CISTI | Catalog of Fishes: genus, species | DiscoverLife | ECOTOX | FAO - Publication: search | Faunafri | Fishipedia | Fishtrace | GloBI | Google Books | Google Scholar | Google | IGFA World Record | OneZoom | Open Tree of Life | Otolith Atlas of Taiwan Fishes | PubMed | Reef Life Survey | Socotra Atlas | TreeBase | Tree of Life | Wikipedia: Go, Search |