Yongdongaspis

Yongdongaspis Temporal range: Llandovery, ~436  Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓ Telychian
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Infraphylum:	Agnatha
Superclass:	† Cephalaspidomorphi
Class:	† Galeaspida
Order:	† Eugaleaspidiformes
Family:	† Yongdongaspididae Chen et al., 2022
Genus:	† Yongdongaspis Chen et al., 2022
Species:	†Y. littoralis
Binomial name
†Yongdongaspis littoralis Chen et al., 2022

Yongdongaspis, colloquially known as the Binhai Yongdong, ^{[1] [2]} is an extinct genus of galeaspid vertebrates within the monotypic family Yongdongaspididae. The type species is Y. littoralis and it was found in the Silurian-aged Huixingshao Formation of China. ^[3] This makes it the oldest known fish fossil discovered in Chongqing to date.

Discovery and naming

The holotype was excavated in July 2020 and was prepared in 2021, before being named as the new species Yongdongaspis littoralis in July 2022. ^[3]

Description

Based on the holotype, Yongdongaspis only grew to around 5 centimetres (2.0 in) long. ^{[2] [3]}

References

1. "Over 400-mln-yr-old fossil of fish found in China - China.org.cn". www.china.org.cn.
2. "They find remains of a fish that lived 400 million years ago". March 4, 2022.
3. Chen, Yang; Gai, Zhikun; Li, Qiang; Wang, Jianhua; Peng, Lijian; Wei, Guangbiao; Zhu, Min (April 2022). "A New Family of Galeaspids (Jawless Stem-Gnathostomata) from the Early Silurian of Chongqing, Southwestern China". Acta Geologica Sinica - English Edition. 96 (2): 430–439. Bibcode:2022AcGlS..96..430C. doi:10.1111/1755-6724.14909. S2CID   247063430.