The first record of redfieldiiform fish (Actinopterygii) from the Upper Triassic of Korea: Implications for paleobiology and paleobiogeography of Redfieldiiformes

Kim, Su Hwan; Lee, Yuong‐Nam; Park, Jin‐Young; Lee, Sung‐Jin; Lee, Hang-Jae

doi:10.1016/j.gr.2019.11.008

Cited by 4 publications

(5 citation statements)

References 43 publications

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“…The Amisan Formation is known to 1,000 m thick and consists of the lower sandstone units, the lower shale unit, the middle sandstone units, the middle shale unit, and the upper sandstone unit (Yang, 1999). Diverse fossils have been documented from the Amisan Formation, including plants (Kim, 1976, 1990, 2001; Kimura and Kim, 1984; Kim et al, 2002; Kim and Roh, 2008), bivalves (Kim et al, 2015), conchostracans (Kim and Lee, 2015), insects (Nam and Kim, 2014; Nam et al, 2017), and fishes (Kim et al, 2020). Of these, plant and conchostracan fossils have been used for age-dating the Amisan Formation.…”

Section: Geological Settingmentioning

confidence: 99%

A new titanopteranMagnatitan jongheonin. gen. n. sp. from southwestern Korean Peninsula

et al. 2022

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Titanopterans are spectacular, giant, predatory insects mainly known from the Triassic, but they are known from a few localities in Central Asia (including European Russia) and Australia. The Nampo Group is a nonmarine sequence, located on the southwestern Korean Peninsula, the age of which has remained controversial, due to lack of proper age-constraining fossils. Here, we report a new titanopteran Magnatitan jongheoni n. gen. n. sp. from the Amisan Formation, Nampo Group. The division of the radius anterior and radius posterior beyond the distal half of the fossil wing is a characteristic of the family Paratitanidae. This is the first discovery of a titanopteran fossil outside of Central Asia and Australia, suggesting a possible circum-Tethys oceanic distribution. Given the possibly widespread distribution of titanopterans, this group might have played a critical role as giant predatory insects in Triassic terrestrial ecology. Because titanopterans have never been found beyond the Triassic-Jurassic boundary, the occurrence of a titanopteran corroborates the Triassic age of the Nampo Group. UUID: http://zoobank.org/10177029-0044-424f-9816-e3fb057cfe85

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Section: Geological Settingmentioning

confidence: 99%

A new titanopteranMagnatitan jongheonin. gen. n. sp. from southwestern Korean Peninsula

et al. 2022

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“…3 c–e), it is reasonable to consider this structure as the crystalline lens. The possible crystalline lens is also recognizable in a specimen of Hiascoactinus 16 .…”

Section: Discussionmentioning

confidence: 82%

“…The Amisan Formation is interpreted as alluvial-fan to lacustrine-delta environments 13 , and its depositional age is generally considered Late Triassic or Late Triassic-Early Jurassic based on fossil records 14 , 15 . A single specimen of Redfieldiiformes, Hiascoactinus boryeongensis , was reported from the Amisan Formation, and it is distinguished from Megalomatia mainly by a single plate-like branchiostegal ray and the caudally positioned dorsal and anal fins in near opposition to each other 16 . Accordingly, Megalomatia represents a new taxon, not different ontogenetic stages of Hiascoactinus .…”

Section: Introductionmentioning

confidence: 99%

A new exceptionally well-preserved basal actinopterygian fish in the juvenile stage from the Upper Triassic Amisan Formation of South Korea

Kim,

Lee,

Nam

et al. 2024

Sci Rep

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The study of the large paraphyletic group of extinct ‘palaeoniscoid’ fishes has shed light on the diversity and evolutionary history of basal actinopterygians. However, only a little ontogenetic information about ‘palaeoniscoids’ is known because their records in the early stages of development are scarce. Here, we report on a growth series of ‘palaeoniscoids’ in the juvenile stage from the Upper Triassic Amisan Formation of South Korea. Fourteen specimens, including five counterpart specimens, represent a new taxon, Megalomatia minima gen. et sp. nov., exhibiting ontogeny and exceptional preservation with the eyes possibly containing the crystalline lens, the otoliths, and the lateral line canals without covering scales. This discovery allows us to discuss the adaptations and evolution of basal actinopterygians in more detail than before. The otoliths in situ of Megalomatia support the previous interpretation that basal actinopterygians have a sagitta as the largest otolith. The trunk lateral line canal, which runs under the scales instead of passing through them, represents a plesiomorphic gnathostome trait. Notably, the large protruded eyes suggest that Megalomatia probably has binocular vision, which would have played a significant role in targeting and catching prey with the primitive jaw structure. In addition, the firstly formed skeletal elements such as the jaws, pectoral girdle, and opercular series, and the posteroanterior pattern of squamation development are likely linked to the adaptation of young individuals to increase their viability for feeding, respiration, and swimming.

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“…Redfieldiiformes Berg, 1940 Redfieldiiformes are a clade of actinopterygians formed by at least 17 genera, known from the Lopingian to Early Jurassic, mostly in non-marine environments of Australia, Africa (Morocco, South Africa, Zambia and possibly Madagascar), Asia (South Korea), South America (Argentina), North America (USA) and putatively Europe (England, Germany, Ireland, Poland and Switzerland, see Gibson, 2018, Gouiric-Cavalli et al, 2017, Hutchinson, 1973a, Kim et al, 2020, Lombardo, 2013, Schaeffer, 1984, Schaeffer and Mc Donald, 1978, Sytchevskaya et al, 2009. Their general features include an elongated body covered with ganoid scales, the dorsal and anal fins located posteriorly, and a hemi-heterocercal caudal fin.…”

Section: Palaeontological Systematics Actinopterygii Cope 1887mentioning

confidence: 99%

Overview of the Late Triassic (Carnian) actinopterygian fauna from the Argana Basin (Morocco)

Khalloufi¹

2021

Comptes Rendus. Géoscience

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The first record of redfieldiiform fish (Actinopterygii) from the Upper Triassic of Korea: Implications for paleobiology and paleobiogeography of Redfieldiiformes

Cited by 4 publications

References 43 publications

A new titanopteranMagnatitan jongheonin. gen. n. sp. from southwestern Korean Peninsula

A new titanopteranMagnatitan jongheonin. gen. n. sp. from southwestern Korean Peninsula

A new exceptionally well-preserved basal actinopterygian fish in the juvenile stage from the Upper Triassic Amisan Formation of South Korea

Overview of the Late Triassic (Carnian) actinopterygian fauna from the Argana Basin (Morocco)

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