Re-evaluation of the Palasteriscidae Gregory, 1900, and the early phylogeny of the Asteroidea (Echinodermata)

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Abstract

Foliaster transversus n.gen. and sp. (Echinodermata: Asteroidea) is assigned to the Ordovician through Devonian family Palasteriscidae. Platanaster is redescribed; both it and Foliaster are thought to have been suspension feeders that extended their arms into the water column. Ampullar basins in both were external; there are no podial pores. The strongly petaloid arm of Foliaster with widely separated podial basins is unique. Two competing phylogenies have been offered for the origin of stelleroids, one treating edrioasteroids as ancestral, the other favoring crinoids. In the latter hypothesis, the Palasteriscidae is the primitive asteroid family, and Platanaster is an example of the first true asteroids. -from Author

Original languageEnglish (US)
Pages (from-to)123-134
Number of pages12
JournalJournal of Paleontology
Volume68
Issue number1
DOIs
StatePublished - Jan 1 1994

ASJC Scopus subject areas

  • Palaeontology

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