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Typification and taxonomy of Gyrosigma tenuissimum (W. Sm.) J.W. Griffith & Henfr., comparison with Gyrosigma coelophilum N. Okamoto & Nagumo and description of two new taxa: Gyrosigma tenuissimum var. gundulae var. nov. and Gyrosigma baculum sp. nov. (Pleurosigmataceae, Bacillariophyta)
Sterrenburg, F.A.S.; De Haan, M.; Herwig, W.E.; Hargraves, P.E. (2014). Typification and taxonomy of Gyrosigma tenuissimum (W. Sm.) J.W. Griffith & Henfr., comparison with Gyrosigma coelophilum N. Okamoto & Nagumo and description of two new taxa: Gyrosigma tenuissimum var. gundulae var. nov. and Gyrosigma baculum sp. nov. (Pleurosigmataceae, Bacillariophyta). Phytotaxa 172(2): 71-80
In: Phytotaxa. Magnolia Press: Auckland. ISSN 1179-3155; e-ISSN 1179-3163, more
Peer reviewed article  
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Keywords
    Gyrosigma baculum W.E.Herwig & F.A.S.Sterrenburg, 2014 [WoRMS]; Gyrosigma coelophilum Okamoto & Nagumo, 2003 [WoRMS]; Gyrosigma tenuissimum (W.Smith) Griffith & Henfrey, 1856 [WoRMS]; Gyrosigma tenuissimum var. gundulae P.E.Hargraves & F.A.S.Sterrenburg, 2014 [WoRMS]
    Marine/Coastal
Author keywords
    Gyrosigma tenuissimum; Gyrosigma coelophilum; Gyrosigma tenuissimum var.gundulae; Gyrosigma baculum; typification
Authors  Top 
  • Sterrenburg, F.A.S.
  • De Haan, M., more
  • Herwig, W.E.
  • Hargraves, P.E.
Abstract
    Gyrosigma tenuissimum (W.Sm.) J.W. Griffith & Henfr. was examined in the original material and an emended description is presented. Its protologue contains an error of taxonomic significance: in the type material, the valve and raphe sternum do not show the considerable flexure described and illustrated in Smith (1853). A comparison with Gyrosigma coelophilum N. Okamoto & Nagumo revealed that the latter, although similar in several characters, differs sufficiently in others to warrant separate specific status. Descriptions of two new taxa are given: Gyrosigma tenuissimum var. gundulae var. nov. and Gyrosigma baculum sp. nov. Both show very fine longitudinal striae at or beyond the limit of ordinary light microscopy and are practically non-sigmoid.
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