Hydrozoa (hydrozoans; from Ancient Greek ὕδωρ (húdōr; "water") and ζώα (zóa; "animals")) is a taxonomic class of individually very small, predatory animals, some solitary and some colonial, most of which inhabit saline water.

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.

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.

6 days ago · The Class Hydrozoa is morphologically the most diverse group of cnidarians. Although marine species vastly outnumber freshwater ones, the freshwater genus Hydra may nevertheless represent the best-known hydrozoan.

Hydrozoa (hydrozoans, from ancient Greek ὕδρα, hydra, "sea serpent" and ζῷον, zoon, "animal") are a taxonomic class of individually very small, predatory animals, some solitary and some colonial, most living in salt water.

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 ...

Oct 31, 2023 · 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.

Apr 2, 2021 · The hydrozoans (Hydrozoa) are animals that belong to an order of the phylum Cnidaria that includes almost entirely colonial organisms. These can be fixed to the substrate, or moving freely through the waters.

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.

Hydrozoans, also known as Hydrozoa, are a diverse and fascinating group of small marine animals belonging to the phylum Cnidaria. They are found in oceans all around the world, from shallow coastal waters to the deep sea.