zoo-, zoa-, zo-, -zoic, -zoid, -zoite, -zoal, -zonal, -zooid, -zoon, -zoa, -zoan

(Greek: animal, animals; living beings; life)

An animal with spines or spine-like growths.
A large class of sedentary marine coelenterates which includes sea anemones and corals; the medusoid phase is entirely suppressed.

Coelenterates are invertebrate animals that include the hydras, jellyfish, sea anemones, and corals, all of which are characterized by a single internal cavity serving for digestion, excretion, and other functions and having tentacles on the oral (mouth) end.

Medusoid refers to the tentacled, usually bell-shaped, free-swimming sexual stage in the life cycle of a coelenterate; such as, a jellyfish.

actinozoa, anthozoa
Solitary or colonial coelenterates without any free-swimming medusa stage and with the coelenteron divided by mesenteries.

The group includes most of the common sea-anemones and corals.

Coelenterata consist of a rather large phylum of sedentary or free-swimming animals having a radially symmetrical sac-like body with a mouth at one end, usually surrounded by a ring of stinging tentacles.

The digestive cavity, known as the coelenteron, has only this opening, but repeated budding may give rise to a colony in which all the body-cavities are connected with each other.

The body-wall is diploblastic, that is, made of two layers of cells, ectoderm and endoderm with a gelatinous layer known as the mesogloea between them.

The individuals of a colony are known as polyps or hydroids. They form the asexual sedentary generation which alternates with a free-swimming sexual phase known as the medusa. The latter is a disc-shaped jelly-fish which breaks away from the parent colony and swims away. It produces gametes and after fertilization has taken place, a new polyp colony develops.

Included in the Coelenterata are corals and anemones in which the hydroid stage is dominant, jelly-fish in which the medusoid stage is dominant, and complex forms such as the Portuguese Man-of-war formed by a large floating colony of diverse polyps.

—A.W. Leftwich, A Dictionary of Zoology;
Crane Russak & Company; New York; 1964.
Of or pertaining to the Actinozoa.
Saltwater animals, such as corals, sea anemones, sea fans, etc.
agrizoology (s) (noun)
The study of wild animals and their influence on soil conditions and how they are affected by soil situations.
agrizoophobia (s) (noun) (no plural)
An exceptional or excessive fright of all wild animals: As a result of her agrizoophobia, Nancy never wanted to go to the zoo with her parents, or even with the others in her class at school, because she was so apprehensive that one of the animals might attack and kill her.
amorphozoa, amorphozoic
Animals without a mouth or regular internal organs; such as, the sponges.
A rarely used taxon of the animal kingdom erected in contrast to Parazoa (taxon of the animal kingdom at one time erected to contain the phylum Porifera) and which therefore contained all animals except Protozoa and Porifera.
antherozoids, antherozooids
Motile male gametes produced in antheridia; spermatozoids.
Another name for the Zoophytes called Actinozoa, including sea-anemones, coralline polypes, etc.
Any of the solitary or colonial sessile (permanently attached or fixed and not free-moving, as corals and mussels) marine coelenterates of the class Anthozoa, including the corals, sea anemones, and sea pens, in which the body is in the shape of a polyp (having a cylindrical body and an oral opening usually surrounded by tentacles).
Of or pertaining to the Anthozoa.
An individual animalcule of a compound Zoophyte.
See actinozoa.

Related "animal" units: anima-; faun-; therio-.

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