One of the mysteries of the English language finally explained.
A class of echinoderms that comprises the starfishes.
- ‘True starfish are classified in the Asteroidea, a group of echinoderms.’
- ‘The body outline is similar to the Asteroidea, in that they have five arms joined to a central disk (calyx).’
- ‘Members of the Asteroidea are often called ‘true starfish’ and are closely related to the Ophiuroidea, having a common ancestor in the Ordovician.’
- ‘Together, the two ancient fossils demonstrate that the class Asteroidea was established by early in the Ordovician.’
- ‘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.’’
Modern Latin (plural), from Greek asteroeidēs ‘starlike’, from astēr ‘star’.
Top tips for CV writingRead more
In this article we explore how to impress employers with a spot-on CV.