radiata
(Science: zoology) An extensive artificial group of invertebrates, having all the parts arranged radially around the vertical axis of the body, and the various organs repeated symmetrically in each ray or spheromere.
It includes the coelenterates and the echinoderms. Formerly, the group was supposed to be a natural one, and was considered one of the grand divisions of the animal kingdom.
Origin: NL, fr. Radiatus, p. P. See Radiate.
Dictionary > Radiata
You will also like...

Still Water Animals
Animals living in aquatic habitats have diversified and evolved through time. They eventually occupy ecological niches a..

Independent Assortment and Crossing Over
This tutorial describes the independent assortment of chromosomes and crossing over as important events in meiosis. Read..

Vascular Plants: Ferns and Relatives
Ferns and their relatives are vascular plants, meaning they have xylem and phloem tissues. Because of the presence of va..

Lotic Communities & Animals
A running water environment offers numerous microhabitats for many types of animals. Similar to plants, animals in lotic..

Soils
Nutrients in the soil are essential to the proper growth of a land plant. This tutorial deals with the properties of soi..

Ecosystem Succession
If the balance of nature is left untouched, landscapes can change dramatically over time. A previous ecosystem is supers..