Ireland

Freshwater fish found exclusively in Ireland include Killarney Shad Alosa killarnensis (Inland Fisheries Ireland), the Coomasaharan Char Salvelinus fimbriatus (Ittiofauna WM), the Blunt-snouted Irish Char Salvelinus obtusus (Ittiofauna WM), Cole’s Char Salvelinus colii (Wikipedia), Trevelyan's Char Salvelinus trevelyani (p. 6 of Wiley pdf), and Scharffe's Char Salvelinus scharffi (BHL). Three additional species of char are restricted to Lough Melvin on the border of Ireland and the United Kingdom: the Sonaghen Trout Salmo nigripinnis (Ittiofauna WM) (TroutConcert WM), the Gillaroo Trout Salmo stomachius (FishBase), and the Melvin Char Salvelinus grayi (Ittiofauna WM).

Deep-sea marine fish known only from Irish seas include a deepwater cardinalfish Microichthys grandis (Wageningen Univ.) and several snailfishes: Careproctus aciculipunctatus (fig. 1 at ResearchGate), Careproctus merretti (fig. 15 at ResearchGate), Paraliparis abyssorum (fig. 3 at ResearchGate), and Paraliparis bipolaris (GBIF).

Invertebrates unique to Ireland include the Durrow Pearl Mussel Margaritifera durrovensis (Invertebrate Ireland Online), an amphipod crustacean Niphargus wexfordensis (HCRS), a marine amphipod Ischyrocerus fractus (ResearchGate), a burrowing worm anemone Edwardsia delapiae (Habitas), a scuttle fly Megaselia killarneyensis (p. 22 of RES WM pdf), a midge Limnophyes platystylus (p. 125 of IBS WM pdf), an undescribed parasitic wasp "Mesoleptus hibernica" (BBC WM), the platygastrid wasps Platygaster hibernica (p. 36 of IBS WM pdf) and Synopeas hibernicum (p. 38 of BS WM pdf), and a potworm Grania mira (Taylor & Francis) (GBIF).

Endemic vascular plants include the Poulsallagh Sea-lavender Limonium pseudotranswallianum (iNaturalist). Sometimes considered full species are the Fringed Rockcress Arabis brownii (Donegal Wildlife WM) (GBIF) which is usually treated as a subspecies of Arabis hirsuta and Hart’s Saxifrage Saxifraga hartii (colnect) (Ivydene Gardens) which is restricted to Arranmore Island is usually considered a subspecies of the Irish Saxifrage Saxifraga rosacea. The Irish Marsh Orchid Dactylorhiza kerryensis (iNaturalist) in some classifications appears to be restricted to Ireland. Endemic microspecies include Maura Scannell's Whitebeam Sorbus scannelliana (IUCN), the dandelions Taraxacum amarellum (p. 2 of BSBI pdf) (iNaturalist) and Taraxacum webbii (flickr) and Taraxacum dooguei (BSBI pdf), Taraxacum elegantifrons (p. 14 of BSBI pdf), Taraxacum gaelorum (p. 6 of BSBI pdf), Taraxacum hibernicola (p. 14 of BSBI pdf), Hart's Hawkweed Hieracium hartii (BHL), Hieracium argentatum (HerbariaUnited), Scully's Hawkweed Hieracium scullyi (HerbariaUnited), and the Kerry Hawkweed Hieracium sparsifrons (JSTOR) (NBDC).

Fungi known only from Ireland includes Entoloma jennyae (IUCN).

For more information on Ireland's endemic flora and fauna see Ireland's CBD report (CBD pdf). A list of currently recognized vascular plants endemic to the island of Ireland can be found at (p. 31 of NRL WM pdf).