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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 fragacea (strawberry anemone)

Family Actinostolidae

Stomphia coccinea
Stomphia coccinea

Family Aiptasiidae


Family Capneidae


Family Edwardsiidae


Family Gonactiniidae


Family Halcampidae


Family Halcampoididae


Family Haloclavidae


Family Hormathiidae

Calliactis parasitica living on the shell of a common whelk, occupied by soldier crab.
Calliactis parasitica living on the shell of a common whelk, occupied by soldier crab.

Family Metridiidae


Family Sagartiidae


Order Alcyonacea (soft corals)



Family Alcyoniidae

Alcyonium digitatum (dead man's fingers)
Alcyonium digitatum (dead man's fingers)

Family Gorgoniidae

Eunicella verrucosa
Eunicella verrucosa

Family Plexauridae


Order Ceriantharia (tube-dwelling anemone)



Family Arachnactidae

Arachnanthus sarsi, photographed off Rathlin Island
Arachnanthus sarsi, photographed off Rathlin Island

Family Cerianthidae

Pachycerianthus multiplicatus (firework anemone)
Pachycerianthus multiplicatus (firework anemone)

Order Corallimorpharia



Family Corallimorphidae


Order Pennatulacea (sea pens)



Family Virgulariidae


Order Zoantharia



Family Epizoanthidae


Family Parazoanthidae

Isozoanthus sulcatus in Lough Hyne
Isozoanthus sulcatus in Lough Hyne

Class Hydrozoa



Order Anthoathecata (athecate hydroids)



Family Bougainvilliidae

Bougainvillia muscus
Bougainvillia muscus

Family Candelabridae


Family Corymorphidae


Family Corynidae


Family Eudendriidae

Spanish shawl feeding on Eudendrium ramosum
Spanish shawl feeding on Eudendrium ramosum

Family Hydractiniidae

Clava multicornis
Clava multicornis

Family Hydridae (hydras)


Family Pandeiidae


Family Porpitidae (chondrophores)

Velella velella colony
Velella velella colony

Family Tubulariidae

Tubularia indivisa (oaten pipes hydroid)
Tubularia indivisa (oaten pipes hydroid)

Order Leptomedusae (thecate hydroids)



Family Aequoreidae


Family Aglaopheniidae


Family Campanulariidae


Family Haleciidae


Family Halopterididae


Family Kirchenpaueriidae


Family Lafoeidae


Family Plumulariidae


Family Sertulariidae


Order Limnomedusae



Family Olindiidae

Craspedacusta sowerbii
Craspedacusta sowerbii

Order Siphonophorae (siphonophores)



Family Apolemiidae

Apolemia uvaria (string jellyfish)
Apolemia uvaria (string jellyfish)

Family Physaliidae

Portuguese man-o'-war
Portuguese man-o'-war

Class Scyphozoa (true sea jellies)



Order Rhizostomae



Family Rhizostomatidae

Rhizostoma pulmo
Rhizostoma pulmo

Order Semaeostomeae (flag-mouth sea jellies)



Family Cyaneidae

Cyanea capillata (lion's mane jelly)
Cyanea capillata (lion's mane jelly)

Family Pelagiidae


Family Ulmaridae


Order Scleractinia (stony corals, hard corals)



Family Caryophylliidae

Caryophyllia smithii
Caryophyllia smithii

Family Oculinidae

Zigzag coral
Zigzag coral

Class Staurozoa



Order Stauromedusae (stalked jellies)



Family Craterolophidae


Family Kishinouyeidae


Family Lucernariidae


References


  1. https://www.npws.ie/sites/default/files/publications/pdf/IWM38.pdf [bare URL PDF]
  2. "Species Browser".
  3. "Home" (PDF).
  4. "Sea Anemones and Corals - OceanAddicts".
  5. "Common Hydra (Hydra vulgaris) - Detail - Biodiversity Maps".
  6. "Craspedacusta sowerbyi - Detail - Biodiversity Maps".
  7. "Coral reefs in Irish Waters".





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