Elizabeth C. Ruck; Patrick Kociolek:

Preliminary Phylogeny of the Family Surirellaceae (Bacillariophyta)

2004. 236 pages, 5 figures, 5 tables, 65 plates, 14x23cm, 470 g
Language: English

(Bibliotheca Diatomologica, Band 50)

ISBN 978-3-443-57041-5, paperback, price: 86.00 €

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Synopsis top ↑

The diatom family Surirellaceae Kützing (1844) currently includes seven genera: Surirella Turpin, Campylodiscus Ehrenberg ex Kützing, Cymatopleura Smith, Plagiodiscus Grunow & Eulenstein, Hydrosilicon Brun, Stenopterobia de Brébisson ex Van Heurck and Petrodictyon Mann (Round et al. 1990). A cladistic analysis using morphological data for 25 taxa was used to construct a preliminary phylogeny and investigate the evolutionary relationships at both the family and genus levels. Results from this analysis indicate that the family Surirellaceae is not monophyletic. The monophyly of the genera Cymatopleura and Stenopterobia was supported, while the genera Surirella and Campylodiscus were found to be polyphyletic. Mapping of character evolution has identified several instances of homoplasy including the circumferential raphe (the diagnostic feature of the family Surirellaceae) and the position of the two valves of a frustule being perpendicular to one another (a diagnostic feature for the genus Campylodiscus). In order to produce a more natural system of classification, a revision of the family Surirellaceae, especially within the genera Surirella and Campylodiscus, is reaquired.

Contents top ↑

Abstract 5
Introduction 7
Questions to be addressed 7
Nomenclatural background of the Surirellaceae 8
Early ideas on Surirellaceae evolution 9
Material and methods 14
Terminal Taxa 14
Terminology 15
Ingroup taxa descriptions 18
Surirella 18
Campylodiscus 34
Cymatopleura 40
Plagiodiscus 44
Hydrosilicon 45
Stenopterobia 46
Petrodictyon 53
Outgroup taxa descriptions 55
Nitzschia 55
Simonsenia 57
Auricula 58
Entomoneis 61
Cladistic analysis 62
Character descriptions 63
Results 69
Discussion 70
Conclusion 79
Literature cited 79
Plates 92
Figures 222
Tables 232