Definition of Class hydrozoa

1. Noun. Coelenterates typically having alternation of generations; hydroid phase is usually colonial giving rise to the medusoid phase by budding: hydras and jellyfishes.


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Literary usage of Class hydrozoa

Below you will find example usage of this term as found in modern and/or classical literature:

1. A manual of the sub-kingdom cœlenterata by Joseph Reay Greene (1861)
"THE class hydrozoa. SECTION I. MORPHOLOGY AND PHYSIOLOGY OF HYDROZOA. ... The Hydra, or fresh-water polype, is the type; ,of the class Hydrozoa (Jig. ..."

2. A Laboratory Manual for Elementary Zoölogy by Libbie Henrietta Hyman (1919)
"class hydrozoa 3 (2). Solitary or colonial; cylindrical or columnar, ... class hydrozoa 6 (5). Without a velum, and more complex in structure, usually with ..."

3. Outlines of Physiology, Human and Comparative by John Marshall (1868)
"... to form part of the new class Hydrozoa. The Polypi are split up and separated in three directions ; the order of coralline polyps form the class Polyzoa ..."

4. An Introduction to the Classification of Animals by Thomas Henry Huxley (1869)
"... e of the class Hydrozoa. HALLUX (hallex or allex, the great toe), the innermost of the five normal digits of a vertebrate foot. ..."

5. Chambers's Encyclopædia: A Dictionary of Universal Knowledge for the People by Chambers, W. and R., publ (1876)
"HY'DRA, THE, or Fresh-water Polype, is the type of the class HYDROZOA, which, ... On minutely examining the H., or any member of the class Hydrozoa, ..."

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