Gandhia gen. nov.—A New Diatom Genus with Unusual Morphology Split Off from the Genus Navicula Bory
Author:
Kulikovskiy Maxim S.1, Thacker Mital2ORCID, Glushchenko Anton M.1, Kuznetsova Irina V.1, Iurmanov Anton A.1, Karthick Balasubramanian2ORCID, Kociolek John Patrick3ORCID
Affiliation:
1. K.A. Timiryazev Institute of Plant Physiology RAS, IPP RAS, 35 Botanicheskaya St., 127276 Moscow, Russia 2. Biodiversity & Palaeobiology Group, Agharkar Research Institute, Department of Botany, Pune 411004, Savitribhai Phule Pune University, Pune 411007, India 3. Museum of Natural History, Henderson Building, 15th and Broadway, Department of Ecology and Evolutionary Biology, University of Colorado, Boulder, CO 80309, USA
Abstract
A new naviculoid diatom genus, Gandhia gen. nov., was described based on a detailed morphological investigation using light and scanning electron microscopy. Gandhia obtecta (Jüttner and Cox) Kulikovskiy, Glushchenko, Iurmanov, M.Thacker, B.Karthick and Kociolek comb. nov. was previously described as a member of the genus Navicula Bory sensu lato. This species differs from other species in the genus Navicula s.l. by the presence of an internal siliceous lamina covering the alveoli and forming the image of longitudinal lines on either side of the axial area, visible in LM. The presence of this siliceous lamina is similar to laminae in genera such as Pinnularia and Gomphoneis. This unusual morphology is not typical for Navicula sensu stricto, as previously noted by other scientists. Additional investigation of Gandhia obtecta comb. nov. and Gandhia ramosissimoides (H.P. Gandhi) Kulikovskiy, Glushchenko, M.Thacker, B.Karthick and Kociolek comb. nov. from waterbodies of the Western Ghats and the Himalayan region was conducted. Comparison with other species with the same morphological features included two additional species in the genus, namely, Gandhia jakovljevicii (Hustedt) Kulikovskiy, Glushchenko, M.Thacker, B.Karthick, and Kociolek comb. nov. and Gandhia lucida (Pantocsek) Kulikovskiy, Glushchenko, M.Thacker, B.Karthick and Kociolek comb. nov. We discuss the biogeographic patterns of the species, including disjuncts between Europe and Asia.
Funder
Russian Science Foundation framework of state assignment of the Ministry of Science and Higher Education of the Russian Federation Department of Science and Technology Karnataka Forest Department
Subject
Plant Science,Ecology,Ecology, Evolution, Behavior and Systematics
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