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Type: Article
Published: 2015-09-23
Page range: 101–119
Abstract views: 19
PDF downloaded: 1

Achnanthes citronella, A. trachyderma comb. nov. (Bacillariophyta) and allied taxa pertaining to the same morphological group

CRIOBE-USR 3278 CNRS-EPHE-UPVD Laboratoire d’Excellence ‘CORAIL’, F-66000 Perpignan, France
Botanic Garden Meise, B-1860 Meise, Belgium
Hustedt Diatom Study Centre, Alfred Wegener Institut für Polar- und Meeresforschung in der Helmholtz Gemeinschaft, D-27570 Bremerhaven, Germany
Environmental Research and Innovation Department (ERIN), Luxembourg Institute of Science and Technology (LIST), L-4422 Belvaux, Luxembourg
Achnanthes citronella A. trachyderma comb. nov. Achnanthales morphology Indo-Pacific Basin SEM Algae

Abstract

Several diatoms in the family Achnanthaceae (Bacillariophyta), mainly from marine environments, have species with strongly apiculate, lemon-shaped valves. Some of them originally described under the genus Cocconeis (i.e., C. trachyderma or C. citronella), while others were first described as Stauroneis species [i.e. Stauroneis apiculata or S.(?) obesa]. Afterwards, Cocconeis citronella has been recombined within Achnanthes by Hustedt. The type material of C. citronella from Albert Mann’s collection, housed in the Smithsonian Institution (US), has been examined with light microscope; some ambiguities are pointed out and new details added to the original description. The intricate history of the latter taxon is redrawn and comparison with allied taxa are tentatively addressed. Cocconeis trachyderma is lectotypified and recombined as Achnanthes trachyderma comb. nov. Stauroneis apiculata and S.(?) obesa are recombined as Achnanthes apiculata comb. nov. and Achnanthes obesa comb. nov. respectively. The examination with light and scanning electron microscope of several marine samples from the Society Archipelago details the unique morphology of Achnanthes trachyderma which, until recently, has been often misidentified as Achnanthes citronella due to certain similarities between both taxa.