New Zealand Journal of Botany abstracts
New species of Fragilariforma (Bacillariophyceae) from New Zealand
and Australia
Cathy Kilroy
National Institute of Water & Atmospheric Research Ltd
P.O. Box 8602
Christchurch, New Zealand
Email: c.kilroy@niwa.cri.nz
Koen Sabbe
Laboratory of Protistology & Aquatic Ecology
Department of Biology
University of Gent
Krijgslaan 281 - S8
B-9000 Gent, Belgium
Elizabeth A. Bergey
Oklahoma Biological Survey and Department of Zoology
University of Oklahoma
Norman, OK 73019, USA
Wim Vyverman
Laboratory of Protistology & Aquatic Ecology
Department of Biology
University of Gent
Krijgslaan 281 - S8
B-9000 Gent, Belgium
Rex Lowe
Department of Biological Sciences
Bowling Green State University
Bowling Green, OH 43403, USA
Abstract Two new species of Fragilariforma,
F. cassieae sp. nov. and F. rakiuriensis sp. nov., are described
from material from New Zealand, with reference to populations found in Australia.
The new species are similar in shape and size to Fragilariforma lata
and F. hungarica var. tumida but are separated on the basis
of areola and stria density, and shape. The distinguishing features of F.
cassieae are a rhombic shape with narrow protracted ends, and striae
with prominent areolae. In F. rakiuriensis, small forms are similar
in shape to F. cassieae, but larger cells are elongated with a constriction
at the centre. The striae are more widely spaced than in F. cassieae
with a slightly irregular appearance and fine, closely spaced areolae. We
discuss the relationships of the new species within the genus Fragilariforma,
and also discuss the possible existence of further related taxa in the material
examined, or marked shifts in form in their morphological progression during
cell division. The two species described represent further evidence of a
higher degree of endemism in Southern Hemisphere freshwater diatoms, and
particularly in New Zealand and Australia, than has previously been assumed.
Keywords diatom; Bacillariophyta; Fragilariforma
cassieae; Fragilariforma rakiuriensis; New Zealand; Tasmania;
Australia; endemism
B02050 Received 8 July 2002; accepted 17 April 2003; online publication
date 11 September 2003
New Zealand Journal of Botany, 2003, Vol. 41: 535-554
0028-825X/03/4103-0530 $7.00 © The Royal Society of New Zealand
2003
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