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Hydroids

General information

Hydroids are plant-like organisms and belong to the Order „HYDROIDA“. The hydroids do not form a separate taxonomic group of animals, but include several subclasses of Hydrozoans. They are animals and closly related to jellyfish, sea anemones and corals. Many have an complicated lifecycle but generally they go through three stages. First as free swimming planktonic larvae that settles and forms sessile polyps. Second as a small jellyfish like stage where the polyps produce free swimming medusa; and third finnaly the medusa in turn produce planktonic larva.

Hydroids usually exist as colonies, the polyps are protected by a horny perisarc which. All hydroids are carnivorous animals, catching prey in the water column with the aid of stinging and grappling nematocysts. They will be found attached to seaweeds and rocks. They are not always easy to find as many are small or form seaweed like colonies.

Abietinaria

Aeginopsis

Aequorea

Agalma

Aglantha

Aglaophenia

Antennella

Apolemia

Bougainvillia

Candelabrum

Chelophyes

Clytia

Corymorpha

Cryptolaria

Cuspidella

Distichopora

Ectopleura

Errina

Eudendrium

Eutima

Eutonina

Forskalia

Gattya

Gonionemus

Gymnangium

Halecium

Halitholus

Hippopodius

Hydrallmania

Hydrozoa

Kirchenpaueria

Leuckartiara

Macrorhynchia

Millepora

Myrionema

Nemalecium

Nemertesia

Obelia

Oceania

Olindias

Pandea

Pedicellina

Pennaria

Physalia

Physophora

Plumularia

Polyorchis

Porpita

Rhysia

Sarsia

Sertularella

Sertularia

Solanderia

Solmissus

Sphaerocoryne

Staurocladia

Staurostoma

Stephanohelia

Stylactaria

Stylaster

Thuiaria

Thyroscyphus

Tiaropsis

Tima

Tubularia

Velella

Zanclea