A re-description of Fragilaria fonticola Hustedt and its varieties, with three new combinations and one new species from India

ANBUKKARASU VIGNESHWARAN; CARLOS E. WETZEL; DAVID M. WILLIAMS; BALASUBRAMANIAN KARTHICK

doi:10.11646/phytotaxa.453.3.2

Issue: Vol. 453 No. 3: 23 July 2020

Type: Article

Published: 2020-07-23

DOI: 10.11646/phytotaxa.453.3.2

Page range: 179–198

Abstract views: 69

PDF downloaded: 5

**A re-description of Fragilaria fonticola Hustedt and its varieties, with three new combinations and one new species from India**

ANBUKKARASU VIGNESHWARAN⁺⁻
CARLOS E. WETZEL⁺⁻
DAVID M. WILLIAMS⁺⁻
BALASUBRAMANIAN KARTHICK⁺⁻

Biodiversity and Palaeobiology Group, Agharkar Research Institute, Pune, Maharashtra-411004, India Department of Botany, Savitribai Phule Pune University, Pune, Maharashtra-411007, India

Luxembourg Institute of Science and Technology (LIST), Environmental Research and Innovation Department (ERIN), 41 rue du Brill, L-4422 Belvaux, Luxembourg

Department of Life Sciences, the Natural History Museum, Cromwell Road, London SW7 5BD, United Kingdom Department of Life Sciences, The Natural History Museum, Cromwell Road, London, SW75BD, UK

Biodiversity and Palaeobiology Group, Agharkar Research Institute, Pune, Maharashtra-411004, India Department of Botany, Savitribai Phule Pune University, Pune, Maharashtra-411007, India

Algae Bacillariophyta morphology Koyna type material Synedra Western Ghats

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Abstract

Tabularia (Kützing) D.M. Williams & Round has received some attention since its separation from Synedra. The present study investigates Fragilaria fonticola Hustedt and its varieties based on the analysis of the type materials. The combinations were proposed as Tabularia fonticola (Hustedt) C.E. Wetzel & D.M. Williams comb. nov. (≡ Fragilaria fonticola Hustedt), Tabularia angusta (Hustedt) C.E. Wetzel & D.M. Williams comb. nov. et stat. nov. (≡ Fragilaria fonticola var. angusta Hustedt), Tabularia chandolensis (Gandhi) A. Vigneshwaran, D.M. Williams & B. Karthick comb. nov. (≡ Synedra chandolensis Gandhi) and the new species, Tabularia koynensis sp. nov. is also described from the Koyna River basin, Western Ghats, India. The detailed morphological features were analysed under light and scanning electron microscopy. Tabularia koynensis has linear valves outline with square to rounded ends. Striae short, radiate towards ends. This new species compared with T. sinensis, T. fasciculata, T. tabulata, T. kobayasii and Fragilaria longissima, which differ in size, valve shape, striae density and ultrastructure.

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