Early Devonian genus first appearances

Jaekelopterus is an extinct genus of eurypterid, a group of extinct aquatic arthropods. Fossils of Jaekelopterus have been discovered in deposits of Middle Silurian to Early Devonian age, from the Wenlock epoch to Emsian stage.' There are three known species:' the type species J. rhenaniae from Devonian brackish to fresh water strata in the Rhineland, J. howelli from Devonian estuarine strata in Wyoming, and J. marylandicus from Silurian deposits in Maryland. The generic name combines the name of German paleontologist Otto Jaekel, who described the type species, and the Greek word () mean

Pteraspis (from 'wing' or 'fin' and 'shield') is an extinct genus of pteraspidid heterostracan jawless fish. It existed from the Lochkovian to Eifelian epochs of the Devonian period in areas that are now the Americas and Europe.

Aviculopecten is an extinct genus of bivalve mollusc that lived from the Early Devonian to the Late Triassic in Asia, Australia, Europe, North America, and South America.