Checklist of water mites from mainland Portugal and its archipelagos Author Cantallo, Harold 0000-0001-7005-6462 Interdisciplinary Centre of Marine and Environmental Research (CIIMAR), University of Porto, Terminal de Cruzeiros do Porto de Leixões, Avenida General Norton de Matos, s / n, 4450 - 208, Matosinhos, Porto, Portugal. & https: // orcid. org / 0000 - 0001 - 7005 - 6462 Author Gomes, Nuno 0000-0002-5513-6875 Interdisciplinary Centre of Marine and Environmental Research (CIIMAR), University of Porto, Terminal de Cruzeiros do Porto de Leixões, Avenida General Norton de Matos, s / n, 4450 - 208, Matosinhos, Porto, Portugal. & Aquamuseu do Rio Minho, Vila Nova de Cerveira, 4920 - 290, Portugal. & https: // orcid. org / 0000 - 0002 - 5513 - 6875 Author Antunes, Carlos 0000-0003-2294-6174 Interdisciplinary Centre of Marine and Environmental Research (CIIMAR), University of Porto, Terminal de Cruzeiros do Porto de Leixões, Avenida General Norton de Matos, s / n, 4450 - 208, Matosinhos, Porto, Portugal. & Aquamuseu do Rio Minho, Vila Nova de Cerveira, 4920 - 290, Portugal. & https: // orcid. org / 0000 - 0003 - 2294 - 6174 Author Martins, Duarte 0000-0003-3736-5743 Interdisciplinary Centre of Marine and Environmental Research (CIIMAR), University of Porto, Terminal de Cruzeiros do Porto de Leixões, Avenida General Norton de Matos, s / n, 4450 - 208, Matosinhos, Porto, Portugal. & Faculdade de Ciências, Universidade do Porto, rua do Campo Alegre s / n, 4169 - 007 Porto, Portugal & https: // orcid. org / 0000 - 0003 - 3736 - 5743 Author Costa, Dimítri De Araújo 0000-0002-5399-2483 Interdisciplinary Centre of Marine and Environmental Research (CIIMAR), University of Porto, Terminal de Cruzeiros do Porto de Leixões, Avenida General Norton de Matos, s / n, 4450 - 208, Matosinhos, Porto, Portugal. & Aquamuseu do Rio Minho, Vila Nova de Cerveira, 4920 - 290, Portugal. & https: // orcid. org / 0000 - 0002 - 5399 - 2483 text Zootaxa 2022 2022-11-28 5213 4 336 370 journal article 198868 10.11646/zootaxa.5213.4.2 bf19faf6-6e2f-4f68-83c2-79c95be93fa0 1175-5326 7381432 685D4DC1-0C1E-4E76-BEEE-E54749603695 Unionicola crassipes ( Müller, 1776 ) Synonym: Hydrachna crassipes Müller, 1776 ( original designation ) Type material: Unknown, possibly lost. Type locality: Denmark (probably surroundings of Copenhagen) or Norway ( Müller 1776 ) . Geographical distribution: Palaearctic ( Gerecke et al. 2016 ). Distribution in Portugal : Centre: Beira Alta, in Santa Comba Dão, and Côa River, near 10 km to Vilar Formoso; South: Estremadura, in Colares-Sintra municipality; Alentejo, in Ribeira de Odivelas; Guadiana River-between Serpa and Beja municipalities ( Lundblad 1956 ; Valdecasas 1988 ). Ecological notes: In standing and slow-moving freshwater ecosystems, with ectoparasitic larvae of insectchironomids and on larval Trichoptera ( Gerecke et al. 2016 ), in clear water, on a sandy substrate; present in plants, such as Azolla spp. Batrachium spp. , Carex spp. , Juncus spp. , Myriophyllum spp. , Nymphea spp. , and Scirpus spp. ( Lundblad 1956 ) . Unionicola parvula Lundblad, 1954 Synonym: Unionicola ( Pentatax ) parvula Lundblad, 1954 ( original designation ) Type material: Deposited in NRM : Holotype one female ( Lundblad 1954 ), Lundblad No. Präp. 4120; Paratype : One male Lundblad No. Präp. 4381 ( Lundblad 1956 ). Type locality: France : Béziers ( Lundblad 1954 , 1956 ). Geographical distribution: France and Iberian Peninsula ( Gerecke et al. 2016 ; Lundblad 1956 ). Distribution in Portugal : Centre: Beira Alta, in Santa Comba Dão ( Lundblad 1956 ). Ecological notes: Freshwater, at slow-moderate flowing streams( Gerecke et al. 2016 ), on sandy substrate; present in Carex spp. plants ( Lundblad 1956 ). Unionicola hankoi Szalay, 1927 Type material: Paratype : One male deposited in NRM , Lundblad No. Präp. 4501 ( Lundblad 1956 ) . Type locality: Hungary : Balatonsee ( Lundblad 1956 ; Szalay 1927 ). Geographical distribution: Eastern and Southern Europe ( Gerecke et al. 2016 ; Tuzovskij & Semenchenko 2015 ). Distribution in Portugal : Centre: Beira Alta ( Valdecasas 1988 ), in Côa River, near 10 km to Vilar Formoso ( Lundblad 1956 ). Ecological notes: In lentic and lotic freshwater ecosystems ( Erman et al. 2010 ); Found in the mantle cavity (females) or the branchiae (deutonymph forms) of mollusc-unionids ( Gerecke et al. 2016 ); present in Myriophyllum spp. and Juncus spp. ( Lundblad 1956 ) .