- Pycnosteus
"Pycnosteus" is an
extinct genus ofjawless fish from theDevonian .Sources
* "Fishes of the World" by Joseph S. Nelson
* "Vertebrate Fossils and the Evolution of Scientific Concepts" by W. Sargeant
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Pycnosteus
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Psammosteidae — Taxobox name = Psammosteidae status = fossil image caption = Drepanaspis gemuendina and Tiaraspis subtilis fossil range = Early to Late Devonian regnum = Animalia classis = Agnatha ordo = Heterostraci familia = Psammosteidae subdivision ranks =… … Wikipedia
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