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Section through a hydroid. The majority of hydroids are colonial. The original polyp is anchored to a solid substrate and forms a bud which remains attached to its parent. This in turn buds and in this way a stem is formed. The arrangement of polyps and the branching of the stem is characteristic of the species.
Hydroid (botany), a type of vascular cell that occurs in certain bryophytes; Hydroid (zoology), a life stage for most animals of the class Hydrozoa; Garveia, a genus of cnidarians, including: Garveia annulata, the orange hydroid; Garveia arborea, the orange or hedgehog hydroid
A hydroid is a type of vascular cell that occurs in certain bryophytes. In some mosses such as members of the Polytrichaceae family, hydroids form the innermost layer of cells in the stem. At maturity they are long, colourless, thin walled cells of small diameter, containing water but no living protoplasm .
Aglaophenia pluma, the toothed feather hydroid or podded hydroid, is a colonial hydroid in the family Aglaopheniidae and is found worldwide. It lives from the shore to 120m under water. It lives from the shore to 120m under water.
Eucheilota bakeri, the bean clam hydroid, is a species [1] of hydroid in the family Lovenellidae, occurring in the Eastern Pacific: USA and Canada. [ 2 ] The life cycle includes both asexual and sexual stages; the species is capable of reproduction in both stages.
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.
The tubular hydroid resembles a long-stemmed narrow-petalled flower. The stem is encased in a sheath. The polyps are pink or orange and white, with an outer ring of long tentacles. There are short tentacles surrounding the mouth rising from a cluster of yellow bead-like bunches of reproductive sporosacs. [2]
Pennaria disticha, also known as the Christmas tree hydroid, is a species of athecate hydroid in the family Pennariidae. Colonies are common in the Mediterranean Sea growing on rocks close to the surface. This species has been used in research into prey capture.