Piona pusilla (Neuman, 1875)

Synonyms: Nesaea pusilla Neumann, 1875 (original designation); Piona tuberifera Viets, 1910; Piona rotunda disjuncta Viets, 1930

Type material: Possible type material of an adult specimen deposited in NRM, catalogue number NHRSGULI000079078 (GBIF 2022) .

Type locality: Sweden: Öland (GBIF 2022) .

Geographical distribution: Holarctic (Gerecke et al. 2016; Plazi.org 2022).

Distribution in Portugal: South: Alentejo, in Ribeira de Odivelas (Lundblad 1956).

Ecological notes: Slightly brackish to freshwater, at standing/lentic and temporary waters (Gerecke et al. 2016); present in plants, such as Batrachium spp., Myriophyllum spp., Nymphea spp. (Lundblad 1956) .