cocconeis molesta kütz., c. diaphana w.sm. and c. dirupta w.greg. (bacillariophyta): type material, ambiguities and possible synonymies

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ID: 208140
2016
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Abstract
F.T. Kützing introduced Cocconeis molesta with only an uninformative description and a poor illustration: C. molesta has small, oblong valves and is an epiphyte. Another species, Cocconeis diaphana, described by William Smith, is said to have larger valves than C. molesta, with frustules that are relatively oblong. Smith described two forms: one with a distinct fascia on its raphe valve (var. β), the other without this feature. A third species, Cocconeis dirupta was described by Gregory, who expressed doubts that it differed from C. diaphana. Finally, Cocconeis molesta var. crucifera Grunow was first introduced in Van Heurck’s Atlas but was subsequently treated by Van Heurck as a synonym of C. molesta. No previous account has examined the type material of these species. In this paper, we undertake that task and examine type slides and raw material in order to discriminate these different taxa. We conclude by recognizing three species: Cocconeis molesta Kütz., C. diaphana W.Sm. and C. dirupta W.Greg. Cocconeis diaphana var. β is considered to be a synonym of C. dirupta and C. molesta var. crucifera is considered to be a synonym of C. molesta. Lectotypes are designated for C. diaphana and C. dirupta.
Reference Key
riaux-gobin2016europeancocconeis Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Catherine Riaux-Gobin;Pierre Compère;Richard W. Jordan;Michel Coste;Jovita C. Yesilyurt
Journal journal of life economics
Year 2016
DOI
10.5852/ejt.2016.204
URL
http://www.europeanjournaloftaxonomy.eu/index.php/ejt/article/view/329
Keywords Keywords not found

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