Tachidius discipes Giesbrecht 1881

Tachidius discipes Giesbrecht, 1881 References and records from Norway

Tachidius brevicornis (Müller), Lilljeborg, 1853 – Boeck (1865): 257; Sars (1911): 328 – 330; Brehm (1917): 609 – 623.

Trachidius brevicornis, Lilljeborg, 1853 – Sars (1863b): 54.

Tachidius arcticus sp. nov. – Olofsson (1917): 36.

Tachidius spitzbergiensis sp. nov. – Olofsson (1917): 32 – 34.

Tachidius spitzbergiensis Olofsson (1917) – Olofsson (1918): 183 – 646.

Tachidius discipes Giesbrecht, 1881 – Scott (1903): 10 – 11.

Olofsson (1917, 1918) considered T. spitzbergiensis a distinct, valid species, morphologically very close to T. discipes but still clearly distinguishable. Olofsson (1917, 1918) recorded it from freshwater habitats in the Advent Bay and from brackish-water habitats at Billen Bay and a brackish lagoon near Nordenskiold Glacier (Svalbard, Spitsbergen). The description of T. arcticus by Olofsson (1917) is based on material consisting of a single male specimen found in a brackish-water habitat at Green Harbour, Svalbard. This species is also considered a junior subjective synonym of T. discipes.

This species was recorded from Spitsbergen (Brehm 1917), but without further indications about the exact locality. Sars (1863b, 1911) reported this species from the Norwegian mainland, a shallow creek of the Oslofjord and brackish waters in many other places on the South and West coasts of Norway. This species seems to be tolerant of a wide range of salinity and is reported from Norway (marine habitat) by several other authors – Oslofjord (Boeck 1865), Bogfjord – Northern Norway (Scott 1903).