Jinjuichthys
| Jinjuichthys Temporal range:
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|---|---|
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| Hypothetical restoration of Jinjuichthys as an ichthyodectiform | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Order: | †Ichthyodectiformes (?) |
| Family: | †Chuhsiungichthyidae |
| Genus: | †Jinjuichthys Kim et. al., 2014 |
| Species: | †J. cheongi
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| Binomial name | |
| †Jinjuichthys cheongi Kim et. al., 2014
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Jinjuichthys is an extinct genus of ray-finned fish, possibly an ichthyodectiform, from the Early Cretaceous (Albian) of South Korea.
Discovery and naming
[edit]The generic name Jinjuichthys means 'fish of Jinju' based on the city with the same name to which its type locality Jinju Formation belongs, while the specific name cheongi references the Korean geologist Cheong Chang Hi in honor of his contributions to the understanding of the biogeography of Korea. The holotype (PSU V 1011) is a relatively complete skeleton that lacks the caudal region, with an estimated standard length of 18.7 centimetres (7.4 in), while the paratype (PSU V 1012) consists of the caudal skeleton and caudal fin (the posterior part).[1]
Classification
[edit]Jinjuichthys is included within the family Chuhsiungichthyidae which has been traditionally placed within the order Ichthyodectiformes.[1] However, Alvarado-Ortega (2024) questioned the placement of Bardackichthys and members of Chuhsiungichthyidae (especially Jinjuichthys and Mesoclupea) within ichthyodectiforms based on phylogenetic analysis and various anatomical differences. The uroneural (modified neural arch) of Jinjuichthys is preserved in dorsal position, unlike that of ichthyodectiforms which is preserved in lateral position. Jinjuichthys also differed from other ichthyodectiforms by having three or four longitudinal cavities instead of two, lacking the saber-like rays in the pelvic and pectoral fin, and possibly lacking the ethmopalatine, a cranial suture connecting the ethmoid and palatine bone.[2]
References
[edit]- ^ a b Kim, Haang-Mook; Chang, Mee-Mann; Wu, Feixiang; Kim, Yang-Hee (January 2014). "A new ichthyodectiform (Pisces, Teleostei) from the Lower Cretaceous of South Korea and its paleobiogeographic implication". Cretaceous Research. 47: 117–130. doi:10.1016/j.cretres.2013.11.007. Retrieved 27 February 2025 – via Elsevier Science Direct.
- ^ Alvarado-Ortega, Jesús (2024-12-29). "Amakusaichthys benammii sp. nov., a Campanian long-nose ichthyodectiform fish from the Tzimol Quarry, Chiapas, southeastern Mexico". Palaeontologia Electronica. 27 (3): 1–37. doi:10.26879/1444. ISSN 1094-8074.