There are 302 species of cnidarians (phylum Cnidaria) recorded in Ireland.[1]
The cnidarians' distinguishing feature is cnidocytes, specialized cells that they use mainly for capturing prey. Their bodies consist of mesoglea, a non-living jelly-like substance, sandwiched between two layers of epithelium that are mostly one cell thick. They have two basic body forms: swimming medusae and sessile polyps, both of which are radially symmetrical with mouths surrounded by tentacles that bear cnidocytes. Both forms have a single orifice and body cavity that are used for digestion and respiration. Many cnidarian species produce colonies that are single organisms composed of medusa-like or polyp-like zooids, or both (hence they are trimorphic).[2][3][4]
Cnidarians found in Ireland and Irish waters include sea pens, sea anemones, hydroids, sea jellies ("jellyfish") and corals.
Class Anthozoa
Order Actiniaria (sea anemones)
Family Actiniidae
Actinia fragacea (strawberry anemone)
Actinia equina (beadlet anemone)
Actinia fragacea (strawberry anemone)
Anemonia viridis (snakelocks anemone)
Anthopleura ballii (red speckled anemone)
Aulactinia verrucosa (gem anemone)
Urticina eques
Urticina felina (northern red anemones, dahlia anemone)
Family Actinostolidae
Stomphia coccinea
Stomphia coccinea
Family Aiptasiidae
Aiptasia mutabilis
Family Capneidae
Capnea sanguinea
Family Edwardsiidae
Edwardsia claparedii
Edwardsia delapiae
Edwardsia timida
Edwardsiella carnea
Scolanthus callimorphus
Family Gonactiniidae
Gonactinia prolifera
Family Halcampidae
Halcampa chrysanthellum
Family Halcampoididae
Halcampoides elongatus
Family Haloclavidae
Mesacmaea mitchellii
Peachia cylindrica
Family Hormathiidae
Calliactis parasitica living on the shell of a common whelk, occupied by soldier crab.
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