There are 1,774 species of crustaceans recorded in Ireland.
Crustaceans are arthropods of the subphylum Crustacea. Most are aquatic, such as shrimp, barnacles, lobsters, crayfish, krill, but some are also adapted for land living, such as woodlice and crabs.
Class Branchiopoda (water fleas, etc.)
Order Anomopoda
Family Bosminidae
Bosmina sp.
Family Chydoridae 41 species, including: Kurzia latissima
Family Eurycercidae
Eurycercus lamellatus
Eurycercus glacialis
Family Ilyocryptidae
Ilyocryptus sordidus
Family Daphniidae
12 species, including: Ceriodaphnia quadrangula Daphnia longispina Daphnia pulex Simocephalus vetulus
Family Macrothricidae 8 species
Order Ctenopoda
Family Sididae 3 species, including: Sida crystallina Latona setifera
Family Holopediidae 1 species
Order Haplopoda
Family Leptodoridae 1 species
Order Onychopoda
Family Polyphemidae 1 species Polyphemus pediculus
Family Cercopagididae 2 species
Family Podonidae 4 species
Class Malacostraca
Order Leptostraca
Family Nebaliidae 2 species, including: Nebalia bipes
Order Stomatopoda
Family Nannosquillidae 1 species
Family Squillidae 1 species
Order Amphipoda
Family Aoridae 15 species, including: Aora gracilis Lembos websteri Microdeutopus anomalus
Family Ampeliscidae 15 species, including: Ampelisca aequicornis Ampelisca brevicornis Ampelisca diadema Ampelisca spinipes Ampelisca tenuicornis Ampelisca typica
Family Ampithoidae 6 species, including: Amphitholina cuniculus Ampithoe gammaroides Ampithoe helleri Ampithoe rubricata Sunamphitoe pelagica
Family Calliopiidae
Calliopius laeviusculus
Family Caprellidae (skeleton shrimps, ghost shrimps)
11 species, including: Caprella acanthifera Caprella equilibra Caprella linearis (linear skeleton shrimp) Caprella mutica (Japanese skeleton shrimp) Phtisica marina Pariambus typicus
Family Cheirocratidae 1 species: Cheirocratus sundevalli
Family Corophiidae 14 species, including: Chelicorophium chelicorne Corophium arenarium Corophium crassicorne Corophium curvispinum Corophium volutator Ericthonius punctatus
Family Crangonyctidae 1 species: Crangonyx pseudogracilis
Family Eusiridae 6 species
Family Calliopidae 1 species
Family Dexaminidae 8 species, including: Dexamine spinosa
Family Eulimnogammaridae
Eulimnogammarus obtusatus
Family Gammaridae 15–16 species, including:
Echinogammarus marinus Echinogammarus pirloti Echinogammarus stoerensis Gammarus duebeni Gammarus finmarchicus Gammarus lacustris Gammarus locusta Gammarus pulex Gammarus tigrinus Gammarus zaddachi
Family Gammarellidae 2 species
Family Megaluropidae 1 species: Megaluropus agilis
Family Talitridae (landhoppers, sandhoppers, sand fleas)
6 species: Arcitalitrus dorrieni (lawn shrimp) Orchestia gammarellus Orchestia mediterranea Pseudorchestoidea brito Talitrus saltator Talorchestia deshayesii
Family Melphidippidae 2 species
Family Haustoriidae 1 species: Haustorius arenarius
Family Hyperiidae
7 species, including: Hyperia galba
Family Hyalidae 6 species, including: Hyale pontica Hyale prevostii Hyale stebbingi
Family Ischyroceridae 14 species, including: Ischyrocerus anguipes Jassa falcata (scud) Parajassa pelagica Siphonoecetes kroyeranus
Family Leucothoidae 4 species, including: Leucothoe lilljeborgi
Family Colomastigidae 1 species
Family Cressidae
Cressa dubia
Family Stenothoidae 10 species, including: Stenothoe marina
Family Lysianassidae 42 species, including: Lysianassa ceratina Orchomenella nana
Family Synopiidae 2 species
Family Argissidae 1 species
Family Iphimediidae 6 species
Family Stegocephalidae 1 species
Family Acanthonotozomellidae 1 species
Family Epimeriidae 1 species
Family Liljeborgiidae 3 species
Family Pardaliscidae 1 species
Family Melitidae 13 species, including: Melita palmata Abludomelita obtusata Maerella tenuimana
Family Niphargidae 3 species: Microniphargus leruthi Niphargus kochianus subsp. irlandicus Niphargus wexfordensis
Family Oedicerotidae 11 species, including: Perioculodes longimanus Pontocrates altamarinus Pontocrates arenarius Monocorophium acherusicum Synchelidium maculatum
Family Pleustidae 5 species
Family Amphilochidae 5–6 species, including: Amphilochus neapolitanus
Family Cyproideidae 1 species
Family Phoxocephalidae 8–9 species, including: Harpinia antennaria
Family Photidae 8 species, including: Gammaropsis nitida Gammaropsis maculata
Family Pontoporeiidae
7 species: Ampelisca aequicornis Bathyporeia elegans Bathyporeia guilliamsoniana Bathyporeia nana Bathyporeia pelagica Bathyporeia pilosa Bathyporeia tenuipes
Family Urothoidae 4 species: Urothoe brevicornis Urothoe elegans Urothoe marina Urothoe poseidonis
Family Isaeidae 2 species, including: Microprotopus maculatus
Family Microprotidae 1 species
Family Cheluridae 1 species
Family Dulichiidae 2 species
Family Podoceridae 3 species
Family Phtisicidae 2 species
Family Mimonectidae 2? species
Family Scinidae 10 species
Family Lanceolidae 5 species
Family Vibiliidae 4 species
Family Cystisomatidae 4 species
Family Dairellidae 1 species
Family Phronimidae 1 species
Family Phrosinidae 3 species
Family Pronoidae 1species
Family Brachyscelidae 1 species
Family Tryphanidae 1 species
Family Platyscelidae 1 species
Order Bathynellacea
Family Bathynellidae 1 species: Antrobathynella stammeri
Order Cumacea (hooded shrimp, comma shrimp)
Family Bodotriidae
9 species, including: Bodotria scorpioides Cumopsis fagei Cumopsis goodsiri Vaunthompsonia cristata
Family Diastylidae 12 species, including: Diastylis rugosa Diastylis bradyi Diastylis laevis Diastylis rathkei
Family Leuconidae 2 species
Family Nannastacidae 6 species
Family Pseudocumatidae 2 species: Pseudocuma longicorne Pseudocuma simile
Family Lampropidae 2 species
Order Euphausiacea
Family Bentheuphausiidae 1 species
Family Euphausiidae 13 species
Order Decapoda Family Aristeidae 1 species
Family Benthesicymidae 2 species
Family Solenoceridae 1 species
Family Sergestidae 3 species
Family Stenopodidae 1 species
Family Pasiphaeidae 4 species
Family Oplophoridae 9 species
Family Bresiliidae 1 species
Family Nematocarcinidae 2 species
Family Palaemonidae 6 species
Family Processidae 2 species
Family Lithodidae 2 species
Family Chirostylidae 3 species
Family Homolidae 1 species
Family Cymonomidae 1 species
Family Glyphocrangonidae 1 species
Family Laomediidae 1 species
Family Polychelidae 8 species
Family Akanthophoreidae
Akanthophoreus gracilis
Family Alpheidae (snapping shrimp, pistol shrimp, alpheid shrimp) 3 species, including: Alpheus macrocheles
Family Astacidae (freshwater crayfish) 1 species: Austropotamobius pallipes (white-clawed crayfish, Atlantic stream crayfish)
Family Atelecyclidae
1 species: Atelecyclus rotundatus (circular crab, round crab, old man's face crab)
Family Thiidae 1 species
Family Axiidae 2 species, including: Calocaris macandreae
Family Callianassidae 2 species, including: Callianassa subterranea (mud shrimp, ghost shrimp)
Family Calliopiidae
Apherusa jurinei
Family Cancridae
2 species, including: Cancer pagurus (edible crab, brown crab)
Family Corystidae
1 species: Corystes cassivelaunus (masked crab, helmet crab, sand crab)
Family Crangonidae 11 species, including: Crangon allmanni Crangon crangon (brown shrimp, common shrimp, bay shrimp, sand shrimp) Pontophilus spinosus
Family Diogenidae (left-handed hermit crabs)
1 species: Diogenes pugilator (small hermit crab, south-claw hermit crab)
Family Epialtidae
Pisa tetraodon
Family Galatheidae
10 species, including: Galathea intermedia Galathea nexa Galathea squamifera (black squat lobster, Montagu's plated lobster) Galathea strigosa Munida rugosa (rugose squat lobster, plated lobster)
Family Goneplacidae
1 species: Goneplax rhomboides (angular crab)
Family Grapsidae (marsh crabs, shore crabs, talon crabs)
2 species, including: Eriocheir sinensis (Chinese mitten crab, Shanghai hairy crab)
Family Hippolytidae (broken-back shrimp, anemone shrimp) 13 species, including: Hippolyte varians (chameleon shrimp)
Family Inachidae
Inachus dorsettensis (scorpion spider crab) Inachus leptochirus Inachus phalangium (Leach's spider crab) Macropodia rostrata (common spider crab, long-legged spider crab, long-legged crab) Macropodia tenuirostris (slender spider crab)
Family Leucosiidae
5 species, including: Ebalia tuberosa (Pennant's nut crab) Ebalia tumefacta (Bryer's nut crab)
Family Majidae
17 species, including: Eurynome aspera Eurynome spinosa Maja brachydactyla Maja squinado (European spider crab, spiny spider crab, spinous spider crab)
Family Nephropidae (lobsters)
Homarus gammarus (European/common lobster) 3 species, including: Nephrops norvegicus (Norway lobster, Dublin Bay prawn, langoustine, scampi)
Family Paguridae
11 species, including: Anapagurus chiroacanthus Anapagurus hyndmanni Anapagurus laevis Cestopagurus timidus Pagurus bernhardus (common hermit crab, soldier crab) Pagurus cuanensis Pagurus prideaux Pagurus pubescens
Family Parapaguridae 1 species
Family Oregoniidae
Hyas araneus (great spider crab) Hyas coarctatus
Family Palaemonidae
Palaemon elegans Palaemon serratus (common prawn) Palaemonetes varians (common ditch shrimp, river shrimp, Atlantic ditch shrimp)
Family Palinuridae 2 species, including: Palinurus elephas (European spiny lobster, crayfish, cray, common spiny lobster, Mediterranean lobster, red lobster)
Family Pandalidae 5 species, including: Pandalus montagui (pink shrimp, Aesop shrimp, Aesop prawn)
Family Pilumnidae
Pilumnus hirtellus (bristly crab, hairy crab)
Family Pinnotheridae 2 species, including: Pinnotheres pisum (pea crab)
Family Pirimelidae 1 species: Pirimela denticulata
Family Porcellanidae (porcelain crab) 2 species: Pisidia longicornis (long-clawed porcelain crab) Porcellana platycheles (broad-clawed porcelain crab)
Family Portunidae (swimming crabs)
14 species, including: Carcinus maenas (European green crab, European shore crab) Liocarcinus corrugatus (wrinkled swimming crab) Liocarcinus depurator (harbour crab, sandy swimming crab) Liocarcinus holsatus (flying crab) Liocarcinus marmoreus (marbled swimming crab) Liocarcinus navigator (arch-fronted swimming crab) Liocarcinus pusillus (dwarf swimming crab) Necora puber (velvet crab) Portumnus latipes (pennant's swimming crab)
Family Geryonidae 3 species
Family Thoridae (broken-back shrimp, anemone shrimp) Eualus cranchii Eualus occultus Eualus pusiolus
Family Upogebiidae 2 species: Upogebia deltaura Upogebia stellata
Family Xanthidae (mud crabs, pebble crabs, rubble crabs)
6 species, including: Xantho hydrophilus Xantho pilipes (Risso's crab)
Order Isopoda
Family Anthuridae
Cyathura carinata
Family Arcturidae 3 species, including: Astacilla longicornis
Family Armadillidiidae (pill bugs, roly polies, doodle bugs) 7 species, including:
Armadillidium album Armadillidium vulgare (pill-bug, pill woodlouse, roly-poly, doodle bug, potato bug, carpenter)
Family Asellidae
Asellus aquaticus (waterlouse, aquatic sowbug, water hoglouse) Proasellus meridianus (one-spotted waterlouse, one-spotted water-slater)
Family Atylidae
Nototropis swammerdamei Nototropis falcatus
Family Cirolanidae
10 species, including:
Eurydice pulchra (speckled sea louse) Eurydice affinis
Family Idoteidae
8 species, including: Idotea balthica Idotea chelipes Idotea granulosa Idotea linearis Idotea neglecta Idotea pelagica
Family Janiridae 10 species, including: Ianiropsis breviremis Jaera albifrons Jaera forsmani Jaera nordmanni Janira maculosa
Family Ligiidae 1 species: Ligia oceanica (sea slater, common sea slater, sea roach)
Family Limnoriidae (gribble worms) 2 species, including: Limnoria lignorum (gribble)
Family Munnidae 4 species, including: Munna kroyeri
Family Oniscidae 1 species: Oniscus asellus (common woodlouse)
Family Philosciidae 1 species: