Parexus
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Bacaan lanjut
EARLY DEVONIAN (EMSIAN) ACANTHODIAN FAUNAS OF THE WESTERN USA
CAROLE J. BURROW Journal of Paleontology; September 2007; v. 81; no. 5; p. 824-840; DOI: 10.1666/pleo06-009.1
http://www.jstor.org/pss/2808450

Sumber gambar
http://www.btinternet.com/~vendian/FOSSILWEB/new_page_22.htm

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