Ptomacanthus
pto.JPG
Ptomacanthus hidup sekitar hidup sekitar 410 juta tahun lalu. Hanya ada satu spesies yaitu
Ptomacanthus anglicus

Bacaan lanjut

http://thedragonstales.blogspot.com/2009/01/ptomacanthus-braincase-causing-stir.html
http://www.sciencecentric.com/news/article.php?q=09011937-new-piece-the-jigsaw-puzzle-human-origins
http://www.paleoworld.ucoz.ru/news/2009-01-17

Sumber gambar
WAYNE HERBERT QUARRY Geological Conservation Review Volume 16: Fossil Fishes of Great Britain

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