Thyasira scotiana Zelaya, 2009

23. Thyasira scotiana Zelaya, 2009 View in CoL [ Figs 10I–J View FIGURE 10 ]

Thyasira scotiana Zelaya, 2009: 275 View in CoL , figs 12–20

Material examined. • 1 spm, Stn. 2; • 15 spms, Stn. 3; • 5 spms, Stn. 6; • 8 spms, Stn. 7; • 101 spms, Stn. 8; • 16 spms, Stn. 11; • 57 spms, Stn. 13; • 1 spm, Stn. 14; • 4 spms, Stn. 15.

Type locality. South Orkney Islands.

Bathymetric distribution. 15–850 m.

Substrate. Soft bottom.

Geographical distribution. ANTARCTICA: Antarctic Peninsula (?). SUBANTARCTICA: -. SCOTIA ARC: South Orkney Islands, South Shetland Islands. SOUTH AMERICA-.

Remarks. Surprisingly, the species was quite common in the Ardley Cove area in depths between 50 and 100 m. The maximum shell height of our material was about 5.5 mm. Although the maximum dimensions are smaller, both the shell shape and the dimensions of the prodissoconch are consistent with the description by Zelaya (2009). The most similar species is T. falklandica , which is more robust, much heavier and has an inflated shell (Zelaya 2009). The latter was occasionally found on King George Island by Arnaud et al. (1986), Rauschert (1991) and Passos et al. (2007) and must most probably also be assigned to T. scotiana .

References. Arnaud et al. (1986), Rauschert (1991), Passos et al. (2007), Zelaya (2009), Engl (2012).