Cambrian and Ordovician echinoderms from eastern Australia

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Abstract
The edrioasteroid Cambraster tastudorum sp. nov. and the ctenocystoid carpoid Ctenocystis jagoi sp. nov. are described from the medial Middle Cambrian of northern Tasmania. A poorly-preserved Tasmanian eocrinoid of probable Tremadocian age from Beaconsfield is assigned to the Macrocystellidae and an equally poorly-preserved rhombiferan of Middle Ordovician age from Ida Bay is assigned to the Echinoencrinitidae. Dissociated plates of Cambraster and at least two other echinoderm species, one probably belonging to Gogia, are noted in the early Middle Cambrian First Discovery Limestone Member of the Coonigan Formation in western New South Wales. Described from northwestern Queensland are the eocrinoid Ridersia watsonae gen. et sp. nov., the oldest isorophid edrioasteroid and the first from the Late Cambrian, the oral surface of Edriodiscus primotica (Henderson & Shergold) necessitating the new generic name as an edrioasteroid and a further edrioasteroid from the same locality tentatively assigned to Stromatocystites.

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