Onoba filostria ( Melvill & Standen, 1912 )

41. Onoba filostria ( Melvill & Standen, 1912) View in CoL [ Figs 15H–K View FIGURE 15 ]

Rissoa (Onoba) filostria Melvill & Standen, 1912: 349 View in CoL , fig. 9

Material examined. • 27 spms, Stn. 2; • 44 spms, Stn. 7; • 41 spms, Stn. 8; • 11 spms, Stn. 10; • 18 spms, Stn. 11; • 32 spms, Stn. 13; • 2 spms, Stn. 14.

Type locality. Scotia Bay (South Orkney Islands), 16 to 18 m depth.

Bathymetric distribution. 16–75 m.

Substrate. Hard and soft bottom.

Geographical distribution. ANTARCTICA: -. SUBANTARCTICA: -. SCOTIA ARC: South Georgia, South Orkney Islands, South Shetland Islands. SOUTH AMERICA: -.

Remarks. We found this species in depths between 35 and 70 m. Compared with the holotype, well-illustrated in Ponder (1983) in addition to the descriptions in Melvill & Standen (1912) and held in the National Museum Scotland, Edinburgh, we are confident in presenting here the first record of this species outside South Georgia and the South Orkney Islands. In our opinion, it is very likely that Onoba subantarctica wilkesiana ( Hedley, 1916) from the same locality as the present study and shown by Engl (2012) on plate 37, fig. 6, is also O. filostria . Onoba wilkesiana described by Hedley (1916) from Commonwealth Bay and illustrated in fig. 77 is by far not as strikingly thick-shelled as O. filostria and is in fact more reminiscent of a bulbous Onoba subantarctica ( Thiele, 1912) known from the Kerguelen Islands.

References. Ponder (1983), Ponder & Worsfold (1994), Engl (2012).