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- Petraster is a genus of extinct Asteroid echinoderm that lived from the upper Ordovician to the late Silurian. The genus has a large distribution range, fossils have been found in North America, and Australia. Based on related echinoderms, this creature was a slow moving, benthic carnivore that possibly hunted early clams and brachiopods. It also could have had a Planktonic childhood, and also could have regenerated its arms like modern day starfish. (en)
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- A specimen of Petraster kinahani (en)
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- *Coelaster americanus
*Palasterina kinahani
*Palasterina ramseyensis
*Palasterina rigidus
*Petraster angustior (Withers & )Keble, 1934
*Petraster crozonensis (Blake )et al., 2016
*Petraster richi (Withers & )Keble, 1934
*Petraster smythi (McCoy, 1874) (en)
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- *Uranaster (Gregory, 1899) (en)
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- Petraster is a genus of extinct Asteroid echinoderm that lived from the upper Ordovician to the late Silurian. The genus has a large distribution range, fossils have been found in North America, and Australia. Based on related echinoderms, this creature was a slow moving, benthic carnivore that possibly hunted early clams and brachiopods. It also could have had a Planktonic childhood, and also could have regenerated its arms like modern day starfish. (en)
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