Jiangxialepis

Jiangxialepis; Temporal range: Telychian PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Infraphylum:	Agnatha
Class:	† Galeaspida
Order:	† Eugaleaspidiformes
Family:	† Shuyuidae
Genus:	† Jiangxialepis ; Liu et al., 2021
Type species
	Jiangxialepis retrospina; Liu et al., 2021
Other species
	Jiangxialepis jiujiangensisShan et al., 2023 Jiangxialepis rongiLiu et al., 2023

Last updated February 04, 2026

Jiangxialepis is an extinct genus of eugaleaspidiform fish that lived in what is now China during the Telychian stage of the Llandovery epoch.

Description

Jiangxialepis retrospina, the type species, is distinguished from other shuyuids by the presence of a middle dorsal spine, its anterior end of the median dorsal opening slightly disrupting the rostral margin of the head shield, its large and oval-shaped orbital openings, its pineal opening being level with the centre of the orbital opening, and its seven lateral transverse canals on each side.^[1]Jiangxialepis jiujiangensis differs from J. retrospina because it possesses narrow spine-shaped inner cornual processes as well as a sharp and posteriorly positioned median dorsal spine.^[2]Jiangxialepis rongi, meanwhile, is distinguished from both the other two Jiangxialepis species by its broader headshield and the serrated margin of the headshield and median dorsal opening.^[3]

References

↑ Liu, Yi-Long; Huang, Lie-Bin; Zong, Rui-Wen; Gong, Yi-Ming (16 February 2021). "The oldest eugaleaspiform (Galeaspida) from the Silurian Fentou Formation (Telychian, Llandovery) of Wuhan, South China". Journal of Systematic Palaeontology . 19 (4): 253–264. doi:10.1080/14772019.2021.1883755. ISSN 1477-2019 . Retrieved 30 January 2026– via Taylor and Francis Online.
↑ Shan, Xianren; Zhao, Wenjin; Gai, Zhikun (April 2023). "A New Species of Jiangxialepis (Galeaspida) from the Lower Telychian (Silurian) of Jiangxi and its Biostratigraphic Significance". Acta Geologica Sinica - English Edition. 97 (2): 393–403. doi:10.1111/1755-6724.15009. ISSN 1000-9515 . Retrieved 31 January 2026– via Wiley Online Library.
↑ Liu, Wenyu; Shan, Xianren; Lin, Xianghong; Shen, Yiming; Liu, Yuhang; Zhang, Zehao; Gai, Zhikun (15 October 2023). "The first Eugaleaspiforme fish from the Silurian of the Tarim Basin reveals a close relationship between the Tarim and South China blocks at 438 mya". Palaeogeography, Palaeoclimatology, Palaeoecology . 628 111774. doi:10.1016/j.palaeo.2023.111774 . Retrieved 1 February 2026– via Elsevier Science Direct.

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[1] Liu, Yi-Long; Huang, Lie-Bin; Zong, Rui-Wen; Gong, Yi-Ming (16 February 2021). "The oldest eugaleaspiform (Galeaspida) from the Silurian Fentou Formation (Telychian, Llandovery) of Wuhan, South China". Journal of Systematic Palaeontology . 19 (4): 253–264. doi:10.1080/14772019.2021.1883755. ISSN 1477-2019 . Retrieved 30 January 2026– via Taylor and Francis Online.

[2] Shan, Xianren; Zhao, Wenjin; Gai, Zhikun (April 2023). "A New Species of Jiangxialepis (Galeaspida) from the Lower Telychian (Silurian) of Jiangxi and its Biostratigraphic Significance". Acta Geologica Sinica - English Edition. 97 (2): 393–403. doi:10.1111/1755-6724.15009. ISSN 1000-9515 . Retrieved 31 January 2026– via Wiley Online Library.

[3] Liu, Wenyu; Shan, Xianren; Lin, Xianghong; Shen, Yiming; Liu, Yuhang; Zhang, Zehao; Gai, Zhikun (15 October 2023). "The first Eugaleaspiforme fish from the Silurian of the Tarim Basin reveals a close relationship between the Tarim and South China blocks at 438 mya". Palaeogeography, Palaeoclimatology, Palaeoecology . 628 111774. doi:10.1016/j.palaeo.2023.111774 . Retrieved 1 February 2026– via Elsevier Science Direct.

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