Ikan berperisai berasal dari Ordovisium tengah hingga zaman Frasnian di Akhir Devonian.

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Marss, T (1986), Squamation of the thelodont agnathan Phlebolepis. J. Vert. Paleontol. 6: 1-11
Sansom, IJ & DK Elliott (2002), A thelodont from the Ordovician of Canada, J. Vert. Paleontol. 22: 867–870

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