This is the oldest jawed fish with known anatomy.
, paleontologists could identify fossils of extinct ancestors that date back hundreds of millions of years ago, called the Paleozoic era. These primitive sharks, known as acanthodians, were covered in spines. Unlike modern sharks, they evolved bony "armor" around their paired fins.
, cartilaginous sharks and rays, bony ray, and lobe-finned fish by having numerous pairs of spines on its fins and an exterior bony armor.Examination of Fanjingshania was performed by a team of researchers from the Chinese Academy of Sciences, Qujing Normal University, and the University of Birmingham.remains of Fanjingshania were recovered from bone bed samples of the Rongxi Formation at a site in Shiqian County of Guizhou Province, South China.
Fanjingshania has dermal shoulder girdle plates that fuse as a unit to the pectoral, prepectoral, and prepelvic spines. Furthermore, the ventral and lateral portions of the shoulder plates were discovered to extend to the posterior edge of the pectoral fin spine.The species has distinct trunk scales and crowns that are made up of a row of tooth-like elements adorned by discontinuous nodose ridges. Dentine development is unusually recorded in the scales.
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