Two Late Ordovician asteroids (Echinodermata) with characters suggestive of early ophiuroids

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Jugiaster n. gen. is based on the Upper Ordovician asteroid (Echinodermata) Petraster speciosus; in addition, a second Upper Ordovician occurrence, Phyrtosaster casteri, new gen. and sp., is described. Both species exhibit mouth frame characters suggestive of those long considered typical of early ophiuroids, thereby demonstrating the adaptive versatility and complexity of asterozoan diversification. Jugiaster specimens also exhibit delicate ambulacral column articulation. The new fossils indicate the need for much further study before early asterozoan history will be well understood.

Original languageEnglish (US)
Pages (from-to)1476-1485
Number of pages10
JournalJournal of Paleontology
Issue number6
StatePublished - Nov 2007

ASJC Scopus subject areas

  • Palaeontology


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