Thelodonti
Thelodontia2.gif
Ikan berperisai berasal dari Ordovisium tengah hingga zaman Frasnian di Akhir Devonian.

Referensi:
Long, JA (1993), Morphological Characteristics of Paleozoic Vertebrates used in biostratigraphy, in JA Long (ed.), Palaeozoic Vertebrate Biostratigraphy and Biogeography. Johns Hopkins Univ. Press, pp.3-24.
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

Sumber gambar : http://www.palaeos.com/Vertebrates/Units/050Thelodonti/050.600.html

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