Everything about Hyperoartia totally explained
Hyperoartia is a group of
jawless fishes that includes the modern
lampreys and their
fossil relatives, the jawless fishes of the
class Anaspida. Example of hyperoartian from early in their fossil record are
Endeiolepis and
Euphanerops, fishes with hypocercal tails that lived during the Late
Devonian Period. Some
paleontologists still classify these forms among the
jawless armored fishes.
The only hyperoartians surviving today are lampreys, classified in the Petromyzontiformes. The discovery of the fossil
Priscomyzon, pushed back the oldest known occurrence of true lampreys to the Late
Devonian. The evidence of phylogeny, however, suggests that the lamprey lineage diverged much earlier from other vertebrates, rather than arising from
ostracoderm fishes. The origin of Hyperoartia may therefore extend back to the early
Paleozoic, if not earlier.
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