Echinoidea
Definition
- Noun:
- A class of marine animals: "Echinoidea" is the scientific name for a class of echinoderms commonly known as sea urchins, sand dollars, and related forms. They are characterized by a globular or flattened body covered with a rigid shell (test) and movable spines.
Usage Examples
- Noun:
- The Echinoidea are important grazers in many marine ecosystems.
- Fossil records show that the class Echinoidea has existed for hundreds of millions of years.
Advanced Usage
- In taxonomic classification: The term is used in formal biological and zoological contexts to categorize and discuss this specific group of echinoderms.
- The phylogenetic study focused on the evolutionary relationships within the Echinoidea.
Variants and Related Words
- Echinoid (n): An individual animal belonging to the class Echinoidea.
- The researcher examined the test of a fossil echinoid.
- Echinoderm (n): The larger phylum (Echinodermata) to which the Echinoidea belong, also including starfish and sea cucumbers.
Synonyms
- Sea urchins and sand dollars: This is the common descriptive name for the group, though "Echinoidea" is the precise scientific term.
Related Phrases / Collocations
- Class Echinoidea: The full taxonomic designation.
- The specimen was definitively assigned to the class Echinoidea.
- Echinoidea fauna: Refers to the population or variety of these animals in a particular region.
- The Echinoidea fauna of the coral reef is particularly diverse.
Noun
-
sea urchins and sand dollars
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