{"id":2000104281,"date":"2026-03-05T13:32:00","date_gmt":"2026-03-05T11:32:00","guid":{"rendered":"https:\/\/new.igihe.com\/?p=2000104281"},"modified":"2026-03-05T12:33:10","modified_gmt":"2026-03-05T10:33:10","slug":"ancient-fish-fossils-push-back-timeline-of-vertebrate-evolution-by-millions-of-years","status":"publish","type":"post","link":"https:\/\/new.igihe.com\/english\/ancient-fish-fossils-push-back-timeline-of-vertebrate-evolution-by-millions-of-years\/","title":{"rendered":"Ancient fish fossils push back timeline of vertebrate evolution by millions of years"},"content":{"rendered":"\n

The discoveries, including the tiny Eosteus chongqingensis and the predatory Megamastax amblyodus (the largest early vertebrate found so far, before the Devonian), reveal critical stages in the evolution of nearly all modern vertebrates.<\/p>\n\n\n\n

Published in Nature on March 4, 2026, the studies resolve long-standing questions about the early evolution of bony fishes, the ancestors of 98% of living vertebrates, including humans.<\/p>\n\n\n\n

Fossils unearthed in southern China provide a rare view of the ancestral anatomy that underpins modern fish and, eventually, terrestrial vertebrates.<\/p>\n\n\n\n

Eosteus, measuring just three centimeters, combines features of modern bony fish with traits seen in extinct cartilaginous fish and armored placoderms.<\/p>\n\n\n\n

Its \u201cmosaic\u201d anatomy places it at the base of the bony fish lineage, just before the major split into ray-finned and lobe-finned fishes.<\/p>\n\n\n\n

Meanwhile, Megamastax, over one meter long and dating roughly 423 million years ago, was the largest known vertebrate of the Silurian period, an era marked by the recovery from ice age extinctions, stabilized warm climates, and high sea levels.<\/p>\n\n\n\n

High-resolution CT scans revealed complex tooth cushions in its jaws, solving a decades-old mystery about isolated fossil teeth and demonstrating that early vertebrates could reach substantial sizes, supporting sophisticated predator-prey ecosystems long before the so-called \u201cAge of Fishes.\u201d<\/p>\n\n\n\n

Together, these findings position southern China as a cradle of early vertebrate evolution, mapping the emergence of jaws, teeth, and complex anatomy that paved the way for the vertebrate lineage leading to humans.<\/p>\n\n\n\n

\"\"
Life reconstruction of the biggest Silurian vertebrate Megamastax amblyodus.
Credit Image by NICE PaleoVislab, IVPP<\/figcaption><\/figure>\n","protected":false},"excerpt":{"rendered":"

Chinese paleontologists have uncovered the world\u2019s oldest complete bony fish fossils, dating back 436 million years, shedding light on the origins of jaws and teeth in vertebrates.<\/p>\n","protected":false},"author":3,"featured_media":2000104282,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[14],"tags":[75],"byline":[160],"hashtag":[],"class_list":["post-2000104281","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-environment","tag-homenews","byline-theophile-niyitegeka"],"bylines":[{"id":160,"name":"Th\u00e9ophile Niyitegeka","slug":"theophile-niyitegeka","description":"","image":{"id":0,"url":"https:\/\/secure.gravatar.com\/avatar\/?s=96&d=mm&f=y&r=g","alt":"Default avatar","title":"Default avatar","caption":"","mime_type":"image\/jpeg","sizes":[]},"user_id":3}],"contributors":[{"id":160,"name":"Th\u00e9ophile Niyitegeka","slug":"theophile-niyitegeka","description":"","image":{"id":0,"url":"https:\/\/secure.gravatar.com\/avatar\/?s=96&d=mm&f=y&r=g","alt":"Default avatar","title":"Default avatar","caption":"","mime_type":"image\/jpeg","sizes":[]},"user_id":3}],"featured_image":{"id":2000104282,"url":"https:\/\/new.igihe.com\/english\/wp-content\/uploads\/2026\/03\/fol.jpg","alt":"","caption":"Life reconstruction of the biggest Silurian vertebrate Megamastax amblyodus.\nCredit Image by NICE PaleoVislab, IVPP","mime_type":"image\/jpeg","width":700,"height":394,"sizes":{"thumbnail":{"url":"https:\/\/new.igihe.com\/english\/wp-content\/uploads\/2026\/03\/fol.jpg","width":150,"height":84},"medium":{"url":"https:\/\/new.igihe.com\/english\/wp-content\/uploads\/2026\/03\/fol.jpg","width":300,"height":169},"medium_large":{"url":"https:\/\/new.igihe.com\/english\/wp-content\/uploads\/2026\/03\/fol.jpg","width":700,"height":394},"large":{"url":"https:\/\/new.igihe.com\/english\/wp-content\/uploads\/2026\/03\/fol.jpg","width":700,"height":394},"full":{"url":"https:\/\/new.igihe.com\/english\/wp-content\/uploads\/2026\/03\/fol.jpg","width":700,"height":394}}},"_links":{"self":[{"href":"https:\/\/new.igihe.com\/english\/wp-json\/wp\/v2\/posts\/2000104281","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/new.igihe.com\/english\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/new.igihe.com\/english\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/new.igihe.com\/english\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/new.igihe.com\/english\/wp-json\/wp\/v2\/comments?post=2000104281"}],"version-history":[{"count":1,"href":"https:\/\/new.igihe.com\/english\/wp-json\/wp\/v2\/posts\/2000104281\/revisions"}],"predecessor-version":[{"id":2000104283,"href":"https:\/\/new.igihe.com\/english\/wp-json\/wp\/v2\/posts\/2000104281\/revisions\/2000104283"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/new.igihe.com\/english\/wp-json\/wp\/v2\/media\/2000104282"}],"wp:attachment":[{"href":"https:\/\/new.igihe.com\/english\/wp-json\/wp\/v2\/media?parent=2000104281"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/new.igihe.com\/english\/wp-json\/wp\/v2\/categories?post=2000104281"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/new.igihe.com\/english\/wp-json\/wp\/v2\/tags?post=2000104281"},{"taxonomy":"byline","embeddable":true,"href":"https:\/\/new.igihe.com\/english\/wp-json\/wp\/v2\/byline?post=2000104281"},{"taxonomy":"hashtag","embeddable":true,"href":"https:\/\/new.igihe.com\/english\/wp-json\/wp\/v2\/hashtag?post=2000104281"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}