Fragilariforma cassieae C.Kilroy & E.A.Bergey
CHR 565730, Jordan Stream headwaters (Jordan Saddle, Canterbury, South Island, New Zealand), surface sediment samples from pool, C. Kilroy, 13 November 1999.
Isotypes: BM 101032; BRM Zu 5/43; CAS 221053; NIWA diatom collection, Christchurch, New Zealand (sample/slide #226).
Institution holding the type material
New Zealand: Jordan Saddle, Bealey Spur, Goat Pass, (Arthur's Pass National Park); Lake Hochstetter (Westland); St Arnaud Range (Nelson Lakes); Deceit Peaks, Table Hill, Rakeahua Valley, Little Mt Anglem (Stewart Island).
Australia: Clarence Lagoon, Lake Picone (Tasmania).
EtymologyNamed after Dr Vivienne Cassie Cooper in honour of her outstanding contribution to diatom research in New Zealand.
Valves (6-)11-27 μm long, 6.2-9 μm wide. Girdle view: rectangular. Zig-zag colonies. Plastids small, discoid. Open girdle bands, 3-5, with rows of poroids on edges facing epitheca. Valve view: rhombic with narrow protracted apices, to rhombic with slightly concave sides, to rhombic. Striae 15-18 in 10 μm, distinctly punctate, continuous across valve and mantle, often with narrow break along axial area, sometimes central only. Striae radiate centrally to parallel towards apices. Areolae 26-29 in 10 μm. Rimoportula absent. Marginal spines on interstriae, tapering hollow tubes deflected outwards. Apical spines absent. Apical pore fields, ~40 poroids in longitudinal rows, extending onto valve surface. Mantle plaques often present along mantle margin.
NOTE: description abridged to satisfy publisher's copyright requirements.