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Fragilariforma rakiuriensis C.Kilroy & K.Sabbe

Type slide

Deceit Peaks, Stewart Island, New Zealand, M. Charteris, 10 November 1997. CHR 565732.

Isotypes: BM 101033; BRM Zu 5/44; CAS 221054; NIWA diatom collection, Christchurch, New Zealand (#A6/426).

Institution holding the type material

Known distribution

New Zealand

Stewart Island: Deceit Peaks, open rocky stream at 500 m, pH 5; Table Hill, flowing and standing water, pH 5.2-5.6, EC 100 µS/cm.

Australia

Tasmania: Western Lakes, e.g. Sappho Lake, pH c. 6.1, EC 16 µS/cm.

Etymology

Meaning "from Rakiura", one of the Māori names for Stewart Island.

Description

Valves 11-55 µm long, (5.5-)6.5-9 µm wide. Girdle view: narrowly rectangular. Colonies linear. Open girdle bands 2-4, with rows of poroids on edges facing epitheca. Valve view: lanceolate, constricted centrally, with distinctly protracted apices, to rhombic with narrow protracted apices. Constricted-rhombic transition at 22.5-29 µm long. Striae 11-14 in 10 µm, fine, continuous across valve and mantle, approx. parallel but usually irregular, axial break only occasional; areolae not visible in LM. Marginal spines simple tapering hollow tubes on interstriae, absent at apices. Mantle plaques usually absent.

NOTE: abridged to satisfy the publisher's copyright requirements .

Notes

Funding from TFBIS  (Terrestrial and Freshwater Biodiversity Information System), administered by the New Zealand Department of Conservation , is gratefully acknowledged.

Reference

Kilroy C, Sabbe K, Bergey EA, Vyverman W, Lowe R 2003. New species of Fragilariforma (Bacillariophyceae) in New Zealand and Australia. New Zealand Journal of Botany 41: 535-554.