The diatom genus Oricymba in Vietnam and Laos with description of one new species, and a consideration of its systematic placement

Maxim Sergeevich Kulikovskiy; Anton Glushchenko; John Patrick Kociolek

doi:10.11646/phytotaxa.227.2.2

Issue: Vol. 227 No. 2: 23 September 2015

Type: Article

Published: 2015-09-23

DOI: 10.11646/phytotaxa.227.2.2

Page range: 120–134

Abstract views: 30

PDF downloaded: 1

**The diatom genus Oricymba in Vietnam and Laos with description of one new species, and a consideration of its systematic placement**

Maxim Sergeevich Kulikovskiy⁺⁻
Anton Glushchenko⁺⁻
John Patrick Kociolek⁺⁻

Department of Water Plant Taxonomy and Geography, I.D. Papanin Institute for Biology of Inland Waters, Russian Academy of Sciences, 152742 Yaroslavl, Nekouz, Borok; Russia

Department of Water Plant Taxonomy and Geography, I.D. Papanin Institute for Biology of Inland Waters, Russian Academy of Sciences, 152742 Yaroslavl, Nekouz, Borok; Russia Kaluga State University, 248023, Kaluga District, Stepan Rasin street 26, Russia

Museum of Natural History and 4Department of Ecology and Evolutionary Biology University of Colorado, Boulder, Colorado, 80309 USA

diatoms Oricymba new species morphology distribution Vietnam Laos Algae

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Abstract

Species from the genus Oricymba are studied from freshwater ecosystems of Vietnam and Laos. Three species were found in Vietnam, namely O. japonica, O. subovalis and O. perjaponica comb. nov. The two last species are new taxa for the diatom flora of Vietnam. A new species is described from Laos, O. voronkinae sp. nov., and its morphology is documented with light and scanning electron microscopy. Oricymba voronkinae sp. nov. represents the first documented occurrence of the genus Oricymba in Laos. Our findings provide new information about the morphology and species distribution of the genus Oricymba in Indochina. We discuss the systematic position of Oricymba within the Cymbellales.