class actinozoa

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class actinozoa

A sea anemone, a class actinozoa, sways gently in a shallow tide pool.

Definition
  1. Noun:
    • A taxonomic class of marine animals: "Class Actinozoa" refers to a large class of sedentary marine coelenterates (cnidarians) that includes organisms like sea anemones and corals. In their life cycle, the medusoid (free-swimming) phase is entirely absent or suppressed.
Usage Notes
  • The term "Class Actinozoa" is primarily used in formal biological and zoological classification. It is a scientific term and is not commonly used in everyday language.
  • In modern taxonomic systems, this group is often referred to as "Anthozoa." "Actinozoa" can be considered a synonymous or older classification.
Examples
  • Noun:
    • The study focused on the reproductive biology of various species within the class Actinozoa.
    • Sea anemones and stony corals are both members of the class Actinozoa.
Advanced Usage
  • In taxonomic hierarchy: The term is used to denote a specific rank (class) within the phylum Cnidaria.
    • The phylum Cnidaria is divided into several classes, including the class Actinozoa.
Variants and Related Words
  • Anthozoa (n): The modern class name often used synonymously with Actinozoa, encompassing sea anemones, corals, and sea pens.
  • Actinozoan (n/adj): (Noun) An individual organism belonging to the class Actinozoa. (Adjective) Relating to or characteristic of this class.
    • The actinozoan polyp is a common body form.
Synonyms
  • Anthozoa: The more commonly accepted modern synonym for this class of animals.
Related Terms
  • Cnidarian (n): A member of the phylum Cnidaria, which includes jellyfish, hydras, sea anemones, and corals. Actinozoa is a class within this phylum.
  • Polyp (n): The sedentary, cylindrical life stage characteristic of actinozoans, as opposed to the medusa stage.
  • Sessile (adj): Describes organisms that are fixed in one place and not free-moving, a key characteristic of most actinozoans.
class actinozoa

A sea anemone, a class actinozoa, sways gently in a shallow tide pool.

Noun
  1. a large class of sedentary marine coelenterates that includes sea anemones and corals; the medusoid phase is entirely suppressed

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