Hydrozetes confervae (Schrank, 1781)

Synonyms: Acarus confervae Schrank, 1781 (original designation); Hydrozetes terrestris Berlese, 1910

Type material: Unknown, possibly lost.

Type locality: Austria (Schrank 1781) .

Geographical distribution: Holarctic (Davids et al. 2006), remarkably Europe (GBIF 2022).

Distribution in Portugal: North: International Minho River (Cantallo et al. 2021), in Vila Nova de Cerveira, and Valença (São Pedro da Torre) municipalities.

Material examined: 1 undetermined sex adult; Vila Nova de Cerveira, Portugal; 41º56′12.768″N, 8º45′9.108″W; October 2019; coll. by C. Antunes and E. Martins; catalogue number NatMIP -CAOr-0003 .

1 undetermined sex adult; São Pedro da Torre, Portugal; 41º59′27″N, 8º40′50.76″W; 11 May 2020; coll by C. Antunes and E. Martins; catalogue number NatMIP-CAOr-0005 .

Ecological notes: In lakes, ponds and slow-moving waters, as well as present in duckweed Lemna spp. (Davids et al. 2006); found also in the main river stretch and in the guts of European flounder P. flesus .

Remarks: First record mentioned for Portugal (Cantallo et al. 2021), and also represents the first occurrence for Northern Europe.

Hydrozetes lemnae (Coggi, 1897)

Synonym: Notaspis lemnae Coggi, 1897 (original designation)

Type material: Possibly not deposited at scientific collection.

Type locality: Italy, in the area around Bologna, Italy (Coggi 1897) .

Geographical distribution: Semi-cosmopolitan (Palaearctic, Nearctic, Ethiopic, Eastern, Australian, and Neotropical geographical zones) (Subías 2018).

Distribution in Portugal: North: International Minho River (Cantallo et al. 2021), in the tributary section “Rio Mouro, Ponte do Curto” (Monção municipality, 42º4′29.27″N, 8º23′39.12″W).

Material examined: 1 undetermined sex adult; Ponte do Curto, Portugal, 42º4′29.27″N, 8º23′39.12″W; September 2020; coll. by Aquamuseu Team; NatMIP-CAOr-0011 .

Ecological notes: Freshwater, feeding on submerged plant fragments (Pérez-Íñigo 1997). Present in macrophytes (Cantallo et al. 2021).

Remarks: First record mentioned for Portugal (Cantallo et al. 2021).