Definition of echinoid in English:
An echinoderm of the class Echinoidea; a sea urchin.
- Fossils include foraminiferans, brachiopods, echinoids, pelecypods, cephalopods, shark teeth, fish vertebrae, as well as asteroids, gastropods, a pterosaur, a nodosaurid, and decapods.
- We have interpreted it as a synapomorphy for asteroids, ophiuroids, echinoids, and holothuroids, to the exclusion of the crinoids.
- Sponges are preyed upon by gastropods, polychaetes, asteroids, echinoids, turtles, and fishes.
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Relating to or denoting echinoids.
- Seven horizons of echinoid aggregations, totaling approximately 3 % of the channel thickness, occur in the black shale.
- In the echinoid gene order, the tRNA gene cluster follows the putative control region.
- This implies that the ancestral polarity of the 4.6-kb inversion is the echinoid pattern.
Definition of echinoid in:
- British & World English dictionary
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