:Yongdongaspis

{{Short description|Extinct genus of jawless vertebrates}}

{{Speciesbox

| fossil_range = Llandovery,
~{{fossilrange|436}} Telychian

| grandparent_authority = Chen et al., 2022

| parent_authority = Chen et al., 2022

| taxon = Yongdongaspis littoralis

| authority = Chen et al., 2022

}}

Yongdongaspis, colloquially known as the Binhai Yongdong,{{Cite web|url=http://www.china.org.cn/arts/2022-03/05/content_78089072.htm|title=Over 400-mln-yr-old fossil of fish found in China - China.org.cn|website=www.china.org.cn}}{{Cite web|url=https://www.americanjournal.news/they-find-remains-of-a-fish-that-lived-400-million-years-ago/|title=They find remains of a fish that lived 400 million years ago|date=March 4, 2022}} 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.{{cite journal |last1=Chen |first1=Yang |last2=Gai |first2=Zhikun |last3=Li |first3=Qiang |last4=Wang |first4=Jianhua |last5=Peng |first5=Lijian |last6=Wei |first6=Guangbiao |last7=Zhu |first7=Min |title=A New Family of Galeaspids (Jawless Stem-Gnathostomata) from the Early Silurian of Chongqing, Southwestern China |journal=Acta Geologica Sinica - English Edition |date=April 2022 |volume=96 |issue=2 |pages=430–439 |doi=10.1111/1755-6724.14909|bibcode=2022AcGlS..96..430C |s2cid=247063430 }} This makes it the oldest known fish fossil discovered in Chongqing to date.