There are 75 species of echinoderm (phylum Echinodermata) recorded in Ireland.
Class Asteroidea (sea stars)
Order Forcipulatida
Family Asteriidae
Asterias rubens (common sea star) Leptasterias muelleri (northern sea star) Marthasterias glacialis (spiny sea star) Stichastrella rosea
Order Paxillosida
Family Astropectinidae
Astropecten irregularis (sand sea star)
Family Luidiidae
Luidia ciliaris (seven-armed sea star) Luidia sarsi
Order Spinulosida
Family Echinasteridae
Henricia oculata (bloody Henry starfish) Henricia sanguinolenta (northern henricia, bloody henry)
Order Valvatida
Family Asterinidae
Anseropoda placenta Asterina gibbosa (starlet cushion star) Asterina phylactica
Family Poraniidae
Porania pulvillus
Order Velatida
Family Solasteridae
Crossaster papposus (common sunstar) Solaster endeca (purple sunstar, northern sunstar, smooth sun star)
Class Crinoidea (sea lilies, feather stars)
Order Comatulida (feather stars)
Family Antedonidae
Antedon bifida (rosy feather star) Antedon petasus Leptometra celtica
Class Echinoidea (sea urchins)
Order Camarodonta
Family Parechinidae
Paracentrotus lividus (purple sea urchin) Psammechinus miliaris (green sea urchin / shore sea urchin)
Order Clypeasteroida (sand dollars)
Family Echinocyamidae
Echinocyamus pusillus (pea urchin)
Order Echinoida
Family Echinidae
Echinus esculentus (European edible sea urchin)
Order Spatangoida (heart urchins)
Family Loveniidae
Echinocardium cordatum (sea potato) Echinocardium flavescens (yellow sea potato) Echinocardium pennatifidum
Class Holothuroidea (sea cucumbers)
Order Apodida
Family Synaptidae
Labidoplax digitata Leptosynapta bergensis Leptosynapta inhaerens
Order Holothuriida
Family Holothuriidae
Holothuria forskali (black sea cucumber / cotton-spinner)
Order Dendrochirotida
Family Cucumariidae
Aslia lefevrei Cucumaria frondosa (orange-footed sea cucumber) Leptopentacta elongata Ocnus lacteus Ocnus planci Paracucumaria hyndmani (Hyndman's sea apple) Pawsonia saxicola (sea gherkin) Thyonidium drummondii
Family Phyllophoridae
Neopentadactyla mixta Thyone fusus Thyone roscovita
Class Ophiuroidea (brittle stars)
Order Ophiurida
Family Amphiuridae (long-armed burrowing brittle stars)
Amphipholis squamata (brooding snake star, dwarf brittle star) Amphiura brachiata Amphiura chiajei Amphiura filiformis Amphiura securigera
Family Ophiactidae
Ophiactis balli Ophiopholis aculeata (crevice brittle star, daisy brittle star)
Family Ophiocomidae
Ophiocomina nigra (black brittle star / black serpent star) Ophiopsila annulosa
Family Ophiothricidae
Ophiothrix fragilis (common brittle star)
Family Ophiuridae
Ophiocten affinis Ophiura albida (serpent’s table brittle star) Ophiura ophiura (serpent star)
References
Koehler R., 1921 Echinodermes. Faune de France n°1 240 p., 153 fig.PDF(11 Mo) Identification
External links Marine species identification portal Ask About Ireland: Sea Stars Sea Urchins on naturesweb.ie