Family Rhodacaridae Oudemans, 1902 Minirhodacarellus Shcherbak, 1980 • Minirhodacarellus minimus (Karg, 1961) • Original name: Rhodacarellus minimus Karg, 1961. • In: Zoologischer Anzeiger, 166: 128. • Combinations/variations used in Irish literature: Rhodacarus minimus (Karg) (Purvis, 1982). Irish Records: Dune at seashore (Purvis, 1982). Counties: Wexford. Rhodacarellus Willmann, 1935 • Rhodacarellus epigynialis Sheals, 1956 • Original name: Rhodacarellus epigynialis Sheals, 1956. • In: Entomologist’s Monthly Magazine, 92: 102. Irish Records: Pasture (Curry, 1969a; Valarasan, 1971; Piotrowska, 2009); small mammal nests (unpublished data). Counties: Cork, Dublin, Kildare, Wexford. • Rhodacarellus perspicuus Halaśkova, 1958 • Original name: Rhodacarellus epigynialis perspicuus Halaśkova, 1959 • In: Acta Societatis Entomologicae Cechosloveniae, 56: 98. Irish Records: Pasture (Little & Bolger, 1995, Piotrowska, 2009; unpublished data). Counties: Cork, Galway, Kildare. • Rhodacarellus silesiacus Willmann, 1936 • Original name: Rhodacarellus silesiacus Willmann, 1936. • In: Zoologischer Anzeiger, 113: 282. Irish Records: Pasture (Curry, 1969a, 1970, 1971; Valarasan, 1971; Ganley, 1976; Purvis, 1978; Curry et al., 1980; Bolger, 1980; Bolger & Curry, 1980; Piotrowska, 2009); manure on soil surface (Curry, 1979); pasture on peat (Whelan, 1976, 1978, 1985); soil in sugar beet crop (McCafferty & Evans, 1977; Curry & Purvis, 1982); Iris bog at seashore (Purvis, 1982); soil in barley crop (Emmanuel et al., 1985b); winter wheat crop (Kelly & Curry, 1985); nest of Lasius flavus and pasture (Arroyo et al., 2015). Counties: Carlow, Dublin, Galway, Kildare, Limerick, Meath, Wexford. Rhodacarus Oudemans, 1902 • Rhodacarus agrestis Karg, 1971 • Original name: Rhodacarus agrestis Karg, 1971. • In: Die Tierwelt Deutschlands, 59: 322. Irish Records: Pasture (Ganley, 1976). Counties: Dublin. • Rhodacarus calcarulatus Berlese, 1920 • Original name: Rhodacarus calcarulatus Berlese, 1920. • In: Redia, 14: 164. Irish Records: Pasture (Ganley, 1976). Counties: Dublin. • Rhodacarus clavulatus Athias-Henriot, 1961 • Original name: Rhodacarus clavulatus Athias-Henriot, 1961. • In: Acarologia, 3: 502. • Combinations/variations used in Irish literature: Rhodacarus ancorae Karg (Purvis, 1982). Irish Records: Dune, pasture, Iris bog, bracken bed, gorse bank and Salix ditch at seashore (Purvis, 1982). Counties: Wexford. • Rhodacarus coronatus Berlese, 1921 • Original name: Rhodacarus coronatus Berlese, 1921. • In: Redia, 14: 165. Irish Records: Pasture (Ganley, 1976). Counties: Dublin. • Rhodacarus pallidus Hull, 1918 • Original name: Rhodocarus pallidus Hull, 1918. • In: Transactions of the Natural History Society of Northumberland, Durham and Newcastle -upon -Tyne, 5: 57. • Combinations/variations used in Irish literature: Rhodacarus roseus var. pallidus Hull (Halbert, 1920). Irish Records: Seashore in the lichen zone (Halbert, 1920); soil in saltmarsh (Healy, 1975; Speight & Healy, 1977); soil in sugar beet crop (Curry & Purvis, 1982); soil in barley crop (Emmanuel, 1977; Emmanuel et al., 1985b); pasture (Purvis & Curry, 1980). Counties: Dublin, Kildare. • Rhodacarus roseus Oudemans, 1902 • Original name: Rhodacarus roseus Oudemans, 1902. • In: Tijdschrift voor entomologie, 45: 50. Irish Records: In marshy area near lake (Halbert, 1920); upper seashore (Halbert, 1920); on decaying roots (Halbert, 1920); pasture (Curry, 1969a, 1971; Valarasan, 1971; Ganley, 1976; Purvis, 1978; Bolger, 1980; unpublished data); pasture on peat (Whelan, 1976, 1978, 1985); fungal sporocarp (O’Connell, 1994); pasture, rough grazing, broadleaved and coniferous forest (Arroyo et al., 2009); Machair grassland (Arroyo & Bolger, 2011); nest of Lasius flavus and pasture (Arroyo et al., 2015); arable soil (Bolger, in press); soil under Leyland cypress, Monterey pine, Sitka spruce, Norway spruce and pasture (unpublished data); soil in ash and mixed broadleaved woodlands (Little & Bolger, 1995; unpublished data); soil under ash and Scots pine (Arroyo et al., 2012, 2013a); soil under birch, oak, lodgepole pine (unpublished data). Counties: Donegal, Dublin, Galway, Kerry, Kildare, Laois, Limerick, Mayo, Meath, Offaly, Roscommon, Waterford, Wexford, Wicklow. • Rhodacarus strenzkei Willmann, 1957 • Original name: Rhodacarus strenzkei Willmann, 1957. • In: Abhandlungen Naturwissenschaftlicher Verein zu Bremen, 35: 166. Irish Records: Dune, pasture, Iris bog, bracken bed and gorse bank at seashore (Purvis, 1982). Counties: Wexford.

Published as part of Bolger, Thomas, Arroyo, Julio & Piotrowska, Katarzyna, 2018, A catalogue of the species of Mesostigmata (Arachnida, Acari, Parasitiformes) recorded from Ireland including information on their geographical distribution and habitats, pp. 1-220 in Zootaxa 4519 (1) on pages 111-118, DOI: 10.11646/zootaxa.4519.1.1, http://zenodo.org/record/2609574