Hydrozoa - Wikipedia
Hydrozoa (hydrozoans; from Ancient Greek ὕδωρ (húdōr) 'water' and ζῷον (zôion) 'animal') is a taxonomic class of individually very small, predatory animals, some solitary and some colonial, most of which inhabit saline water.
Hydroid | Characteristics & Life Cycle | Britannica
Hydroid, any member of the invertebrate class Hydrozoa (phylum Cnidaria). Most hydroids inhabit marine environments, but some hydroids have invaded freshwater habitats. Hydroids may be either solitary or colonial, and there are about 3,700 known species.
Hydrozoa - The World Hydrozoa Database - World Register of …
2 天之前 · The Class Hydrozoa is the most diverse group of cnidarians. Although marine species vastly outnumber freshwater ones, the genus Hydra may nevertheless be the best known hydrozoan.
Hydrozoa Information | Aquatic Invertebrates - Earth Life
2023年10月31日 · Hydrozoa is a class of aquatic invertebrates that are closely related to corals, jellyfish, and sea anemones. They belong to the phylum Cnidaria, which also includes other gelatinous zooplankton like jellyfish and box jellies. Their …
ADW: Hydrozoa: INFORMATION
The Hydrozoa is a subgroup of cnidarians containging approximately 3700 species. It is a diverse group with a variety of life cycles, growth forms, and specialized structures. Like many cnidarians, hydrozoans have both polyp and medusa stages in their life cycle.
28.2D: Class Cubozoa and Class Hydrozoa - Biology LibreTexts
2024年11月23日 · Class Hydrozoa. Hydrozoa includes nearly 3,200 species; most are marine, although some freshwater species are known. Animals in this class are polymorphs: most exhibit both polypoid and medusoid forms in their lifecycle, although this is variable.
ADW: Hydrozoa: CLASSIFICATION
Confused by a class within a class or an order within an order? Please see our brief essay.
Hydrozoa - New World Encyclopedia
Hydrozoa is a diverse and wide-ranging taxonomic class (sometimes superclass) of marine and freshwater invertebrates within the phylum Cnidaria, whose members are characterized by a life cycle that always includes the presence of planula larva, and the medusa, if present, having a velum, or muscular projection from the subumbrellar margin ...
Hydrozoa - Encyclopedia.com
2018年5月23日 · Hydrozoa is a class within the phylum Cnidaria, which includes sea anemones, corals, and jellyfish. The vast majority are marine species, but freshwater hydrozoans are known, for example, Cordylophora lacustris and Craspedacusta sowerbyi.
Class Hydrozoa - Plymouth State University
Hydrozoa consist of several marine organisms existinting in all three layers of the marine habitat. Some Hydrozoans live on the the surface (velella and Physalia) floating with large sail like structures above water for locomotion and long tentacles with nematocytes or stinging cells below the surface to catch food.