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 Hydrodroma despiciens ( Müller, 1776 ) Synonym: Hydrachna despiciens Müller, 1776 ( original designation ) Type material: Neotype deposited in NRM , catalogue number NHRS-GULI000050084 ( GBIF 2022 ; NRM 2022 ). Type locality: Denmark : Gribsö ( GBIF 2022 ; NRM 2022 ), based on neotype . Geographical distribution: Europe ( Więcek et al. 2020 ). Distribution in Portugal : South: Alentejo, in Ribeira de Odivelas, and Guadiana River-between Serpa and Beja municipalities ( Lundblad 1956 ). Ecological notes: Freshwater environments with low alkalinity; feeds of dead aquatic insects and the adult stage individuals have a preference for Chironomidae (Diptera) egg masses ( Di Sabatino et al. 2010 ); present in plants, such as Batrachium spp. , Myriophyllum spp. , Nymphea spp. , and Scirpus spp. ( Lundblad 1956 ) ; Adapted to acidic marshes environments ( Więcek et al. 2013 ). Remarks: The old records of Hydrodroma despiciens constitute a species complex that has been demonstrated by morphological taxonomy and supported molecular data ( Gerecke 2017 ; Więcek et al. 2020 ). Therefore, it is likely that the Lundblad records for Portugal may be Hydrodroma pilosa but this has not yet been confirmed (Pers. comm., H. Smit). We point out that there is a male in the NRM collection, Lundblad No. Präp. 4242 from the Rio Guadiana near Serpa (Pers. comm., G. Lindberg)