Radiata

[ rey-dee-ey-tuh, -ah-tuh ]

Phonetic (Standard)IPA

noun

, Biology.

(in some classification systems) a major grouping that includes more or less radially symmetrical animals, as coelenterates (jellyfish, sea anemones, corals), ctenophores (comb jellies), and echinoderms (starfish, sea urchins, sea cucumbers).

Origin of Radiata¹

1820–30; < New Latin, noun use of neuter plural of Latin radiātus radiate (adj.)

Both the vitelline membrane and the zona radiata are found in Raja, but in a much less developed condition than in Scyllium.

The stage of about the greatest development of both the vitelline membrane and zona radiata is represented on Pl.

The inner one is the zona radiata with a typical radiately striated structure.

Osseous fish have almost always a zona radiata, which it seems best to assume to be equivalent to that in Elasmobranchii.

In Petromyzon, a zona radiata appears to be present, which is divided in the adult into two layers, both of them perforated.

April 24, 2024gallimaufry

[gal-uh-maw-free ]

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