exocycloida
Definition
- Noun:
- A taxonomic order of echinoderms: "Exocycloida" is the scientific name for an order of sea urchins characterized by a flattened, disc-like shape. These are commonly known as sand dollars or heart urchins.
Usage Notes
- "Exocycloida" is a highly specialized, technical term used almost exclusively in scientific contexts, particularly in zoology, marine biology, and taxonomy. It is not used in everyday conversation.
- As a taxonomic order name, it is always capitalized.
Examples
- Noun:
- The fossil record shows that Exocycloida have existed for millions of years.
- Marine biologists classified the newly discovered species within the order Exocycloida.
Advanced Usage
- In formal scientific writing, the term may be used in its taxonomic hierarchy.
- The class Echinoidea includes the orders Camarodonta and Exocycloida.
Variants and Related Words
- Exocycloid (adj): Pertaining to or characteristic of the order Exocycloida.
- The exocycloid test (shell) is highly adapted for life on the seafloor.
- Clypeasteroida (n): A synonymous order name often used in modern taxonomy for the same group of flat sea urchins.
- Sand dollar (n): The common name for many living species within Exocycloida.
- Heart urchin (n): Another common name for species in this order, referring to their shape.
Synonyms
- Clypeasteroida: The more modern, alternative scientific name for the same taxonomic order.
- Flat sea urchins: A descriptive, non-technical term.
Related Phrases
- Irregular echinoids: A broader category of sea urchins, including Exocycloida, that have bilateral symmetry adapted for burrowing or living on sediment.
Noun
-
flat sea urchins
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