Copidognathus alvinus Bartsch, 1994

Type material: Holotype: MNHN 63 B 8 (Bartsch 1994); Paratype: One female: MNHN 63 B 7 (Bartsch 1994) .

Type locality: Portugal: Azores Archipelago: Lucky Strike hydrothermal field, 37°20′N, 32°17′W (Bartsch 1994).

Geographical distribution: Portugal: Azores Archipelago: Lucky Strike hydrothermal field (Bartsch 1994; GBIF 2022).

Distribution in Portugal: Azores Archipelago: Lucky Strike hydrothermal field (Bartsch 1994, 1996; GBIF 2022).

Ecological notes: Depth 1636 m, marine benthic (Bartsch 1994), common on rocky formations, associated with poriferans, hydrozoans, nematodes, polychaetes, molluscs, crustaceans and pycnogonids (Bartsch 1996).