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单词 Asteroidea
释义

Asteroidea

/ˌastəˈrɔɪdɪə /
plural noun Zoology
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).

Origin

Modern Latin (plural), from Greek asteroeidēs 'starlike', from astēr 'star'.

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更新时间:2024/12/23 4:49:00