Echinoidea

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Echinoidea

[‚ek·ə′noid·e·ə]
(invertebrate zoology)
The sea urchins, a class of Echinozoa having a compact body enclosed in a hard shell, or test, formed by regularly arranged plates which bear movable spines.
References in periodicals archive ?
Differences in morphology and life history traits of the echinoid Echinometra lucunter from different habitats.
Sensitivity to light and the reactions to changes in light intensity of the echinoid Diadema antillarum (Philippi).
Distribution and abundance of the echinoid Diademasetosum (Echinodermata) on sediment-stressed coral reefs in Singapore.
13]C detected among the five echinoids of two different biotopes may suggest that E.
Hal' Dixon (1941-2005) and the fossil echinoids of Jamaica.
purpuratus in California, and increasingly frequently among other echinoid species, during the last several decades (Ward and Lafferty, 2004).
It is Paleocene in age and associated with shallow marine environment due to abundance of coralline algae, gastropods, pelecypods, echinoid fragments and other skeletal debris.
Sand dollar echinoids, members of the order Clypeasteroida, first appeared in the fossil record of the Gulf of Mexico coastal plain in the early part of the Middle Eocene.
Irregular echinoids have played an important role in benthic marine communities since the Jurassic Period and are important to paleontologists given their sturdy skeletal structure, sediment-dwelling habits, widespread distribution, and considerable diversity.
Differencial survivorship, reproduction, growth and nutrient allocation in the regular echinoid Lytechinus variegatus (Lamarck) fed natural diets.