actinozoa
Definition
- Noun:
- A taxonomic class of marine animals: Actinozoa refers to a large class of sedentary marine coelenterates (cnidarians) characterized by a polyp form, including organisms such as sea anemones and corals. In this class, the medusoid (free-swimming jellyfish) stage in the life cycle is entirely absent or suppressed.
Usage Examples
- Noun:
- The vibrant reef was built by various species of actinozoa.
- Biologists study actinozoa to understand coral reef ecosystems.
Advanced Usage
- In taxonomic context: The term "Actinozoa" is used in scientific classification, though it is sometimes considered synonymous with or replaced by the class Anthozoa in modern taxonomy.
- The fossil record provides evidence for early actinozoa.
Variants and Related Words
- Anthozoa (n): The modern taxonomic class name that largely corresponds to the historical group Actinozoa.
- Sea pens and blue corals are members of Anthozoa.
- Actinozoan (n/adj): Pertaining to or a member of the Actinozoa.
- The actinozoan polyp is a fundamental body plan.
Synonyms
- Anthozoans: Marine cnidarians that are exclusively polypoid.
- Corals and anemones: Common names for prominent members of this group.
Related Phrases
- Sedentary marine life: A descriptive phrase for the lifestyle of actinozoa.
- Polyp phase: Refers to the dominant life stage of actinozoa, as opposed to a medusa phase.
Noun
-
a large class of sedentary marine coelenterates that includes sea anemones and corals; the medusoid phase is entirely suppressed
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