Eunophora berggrenii (Cleve) D.G.Mann, M.A.Harper & Levkov
SynonymsAmphora berggrenii Cleve
Type slideArthur's Pass, South Island, New Zealand.
Institution holding the type material
Known distributionKnown from subalpine sites in New Zealand and Tasmania.
EtymologyAfter S. Berggren, collector of the type material.
Frustules amphoroid, girdle view usually seen, with ~ straight dorsal margin and slightly biarcuate ventral margin, (40-)50-90 µm long, 9-12.8 µm deep. Striae 14-16.5 in 10 µm centrally, 15-19(-23) in 10 µm towards poles. Valves thickened centrally in broad zone linking raphe centre to distal mantle. Striae parallel on dorsal valve face, dorsal and ventral mantle, but irregular over most of ventral valve face; clearly punctate. Sternum a very narrow arcuate interruption of striae near central raphe. Raphe system biarcuate, central raphe endings widely separated. Helictoglossae marked thickenings close to the poles. External central raphe endings expanded, near junction between valve face and demarcated ventral mantle. Internal central raphe endings continuing beyond external endings as short central non-coaxial fissures. Girdle bands highly porose.
NOTE: abridged to satisfy the publisher's copyright requirements.
Images of the lectotype of this species are available here.
Harper MA, Mann DG, Patterson JE 2009. Two unusual diatoms from New Zealand: Tabularia variostriata a new species and Eunophora berggrenii. Diatom Research 24: 291-306.