(Figs 8, 16 H, 17 H, 19 H)
Material examined. New Zealand Antarctic Expedition TAN0402: Stn 241, Tangaroa, 4 March 2004, 66° 54 ' 77 ''– 66 ° 55 '01''S, 163 ° 13 ' 65 ''– 163 ° 13 ' 69 ''E (off Buckle Island, Balleny Islands), 70– 78 m.
Description. Monosiphonic, unbranched stems, up to 130 mm high, divided into internodes. Angle between cauline apophyses and stem ca. 45 °. Cauline apophyses with two axillary nematophores, each emerging through simple perisarc hole (Fig. 8 B–C).
Hydrocladia bifurcated (Fig. 8 A). First hydrocladial internode with two similar prongs (Fig. 8 A). Mesial inferior nematophore emerging from strongly marked swelling at proximal third of internode (Fig. 8 D–E); with large, claw-shaped nematoteca (Fig. 8 D–F). Hydrotheca elongate, situated on middle or distal half of internode (Fig. 8 D–E). Abcauline wall straight or slightly convex (Fig. 8 D). Hydrothecal aperture circular, roughly perpendicular to long axis of internode (Fig. 8 A, D).
Gonothecae fusiform, with subterminal aperture.