Priscomyzon

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Priscomyzon Temporal range: Late Devonian PreꞒ Ꞓ O S D C P T J K Pg N Famennian
holotype
Line drawing reconstruction
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Hyperoartia
Order:	Petromyzontiformes
Genus:	Priscomyzon Gess et al., 2006
Type species
Priscomyzon riniensis Gess et al., 2006

Priscomyzon riniensis is an extinct lamprey that lived some 360 million years ago during the Famennian (Late Devonian) in a marine or estuarine environment in South Africa. This small agnathan is anatomically similar to the Mazon Creek lampreys, but is some 35 million years older. Its key developments included the first known large oral disc, circumoral teeth and a branchial basket.