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A class of echinoderms that comprises the starfishes.
- ‘A traditional hypothesis of the Echinodermata using only extant taxonomic groups places the Asteroidea and Ophiuroidea as sister groups based on the shared derived characteristic of a five-rayed body plan.’
- ‘The phylogeny and taxonomy of the Asteroidea led Gregory to begin his paper with a note of frustration: ‘The classification of the Palaeozoic starfishes has long been in chaos.’’
- ‘The body outline is similar to the Asteroidea, in that they have five arms joined to a central disk (calyx).’
- ‘True starfish are classified in the Asteroidea, a group of echinoderms.’
- ‘Together, the two ancient fossils demonstrate that the class Asteroidea was established by early in the Ordovician.’
- ‘Members of the Asteroidea are often called ‘true starfish’ and are closely related to the Ophiuroidea, having a common ancestor in the Ordovician.’
Modern Latin (plural), from Greek asteroeidēs ‘starlike’, from astēr ‘star’.