Definition

1. Noun:
   • A taxonomic genus of echinoderms: A category in biological classification (genus) that includes one or more species of echinoderms, which are marine animals characterized by radial symmetry (usually five-part), a calcareous endoskeleton, and a water vascular system. Examples include starfish, sea urchins, and sea cucumbers.

Usage Examples

• Noun:
  • Acanthaster is a well-known echinoderm genus that includes the crown-of-thorns starfish.
  • The fossil record contains many extinct echinoderm genera.
  • Scientists identified a new echinoderm genus from deep-sea hydrothermal vents.

Advanced Usage

• In taxonomic hierarchy: The term is used in scientific literature to specify the genus-level classification within the phylum Echinodermata.
  • The study focused on the comparative morphology of several echinoderm genera.

Variants and Related Words

• Echinoderm (n): Any member of the phylum Echinodermata.
  • Sea urchins and sand dollars are both echinoderms.
• Echinodermata (n): The phylum name for all echinoderms.
• Genus (n): A principal taxonomic category ranking above species and below family.

Synonyms

• Genus of echinoderms: (Formal synonym)
• Echinoderm taxon (at genus level): (Technical synonym)

Notes on Meaning

• This is a specialized compound noun used almost exclusively in scientific (zoological and paleontological) contexts. It refers specifically to the rank in biological taxonomy, not to the animals themselves in a general sense. The plural form is echinoderm genera.

Noun

1. a genus of echinoderms