class echinoidea

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Definition
  1. Noun:
    • A taxonomic class of marine animals: "Class Echinoidea" is the scientific classification for a group of echinoderms commonly known as sea urchins and sand dollars. These animals are characterized by a globular or flattened, rigid body covered with movable spines.
Usage Examples
  • Noun:
    • The Class Echinoidea includes both spherical sea urchins and flattened sand dollars.
    • Biologists study the evolution of skeletal structure within the Class Echinoidea.
Advanced Usage
  • In taxonomic hierarchy: Used in formal biological and zoological contexts to denote this specific class within the phylum Echinodermata.
    • The fossil record shows that Class Echinoidea has existed since the Ordovician period.
Variants and Related Words
  • Echinoidea (noun): The same term without "class"; often used interchangeably in scientific literature.
    • Research on Echinoidea focuses on their unique water vascular system.
  • Echinoid (noun/adjective): A member of the Class Echinoidea; relating to this class.
    • The beach was littered with echinoid tests (shells).
  • Sea urchin (noun): A common name for many members of this class with a spherical shape.
  • Sand dollar (noun): A common name for members of this class with a flattened, disc-like shape.
Synonyms
  • Sea urchins and sand dollars (common name grouping).
  • Echinoids (scientific/common term for members of the class).
Related Phrases
  • Echinoderm class: A broader phrase indicating its phylum-level grouping.
    • Class Echinoidea is one of the five extant classes of echinoderms.
Noun
  1. sea urchins and sand dollars

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