18. Altenaeum narchii (Passos & Domaneschi, 2006) [Figs 9F–J]

Mysella narchii Passos & Domaneschi, 2006: 390, figs 1–5

Material examined. • 28 spms, Stn. 2; • 43 spms, Stn. 4; • 4 spms, Stn. 5; • 26 spms, Stn. 7; • 115 spms, Stn. 8; • 2 spms, Stn. 9; • 2 spms, Stn. 10; • 45 spms, Stn. 11; • 20 spms, Stn. 13; • 9 spms, Stn. 14; • 12 spms, Stn. 15.

Type locality. In front of the Brazilian Antarctic Station, Admiralty Bay on King George Island, South Shetland Islands, 5–25 m.

Bathymetric distribution. 0–100 m.

Substrate. Hard and soft bottom.

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

Remarks. The main morphological differences to A. charcoti have already been mentioned in the previous species and have been worked out by Passos & Domaneschi (2006). There also seem to be ecological differences. Altenaeum narchii can be found very frequently in the intertidal, but also colonises deeper areas, often together with A. charcoti . We found A. narchii in a depth between 0 and 90 m. It was the fifth most common species in the intertidal. The species is already known from the Maxwell and Admiralty Bays.

References. Passos & Domaneschi (2006), Bick & Arlt (2013).