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Issue: Vol. 655 No. 1: 21 Jun. 2024
Type: Article
Published: 2024-06-21
DOI: 10.11646/phytotaxa.655.1.3
Page range: 37-53
Abstract views: 2
PDF downloaded: 1

Orthoseira variabilis sp. nov., a new diatom from a snow patch in Potter Cove, King George Island, Antarctica

Instituto Multidisciplinario para la Investigación y el Desarrollo Productivo y Social de la Cuenca Golfo San Jorge, CONICET - UNPSJB, Ruta Provincial 1, Km 4, 9000, Comodoro Rivadavia, Argentina. Instituto de Desarrollo Costero, Universidad Nacional de la Patagonia San Juan Bosco, Ruta Provincial 1, Km 4, 9000, Comodoro Rivadavia, Argentina.
División Ficología “Dr. Sebastián A. Guarrera”, Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, Paseo del Bosque s/n, B1900FWA, La Plata, Argentina.
Departamento de Biología Costera, Instituto Antártico Argentino, 25 de mayo 1143, San Martín, Buenos Aires, Argentina. Museo Argentino de Ciencias Naturales “B. Rivadavia”, Av. A. Gallardo 470, C1405DJR, Buenos Aires, Argentina.
Departamento de Biología Costera, Instituto Antártico Argentino, 25 de mayo 1143, San Martín, Buenos Aires, Argentina. Departamento de Ciencias Básicas, Universidad Nacional de Luján, Ruta 5 y Av. Constitución, CP 6700, Luján, Buenos Aires, Argentina.
División Ficología “Dr. Sebastián A. Guarrera”, Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, Paseo del Bosque s/n, B1900FWA, La Plata, Argentina
centric diatom new species sympagic environment taxonomy valve morphology Algae

Abstract

A new species of diatom, Orthoseira variabilis sp. nov., is described here based on snow samples collected in Potter Cove area, King George Island/Isla 25 de Mayo, Antarctica. The new taxon was characterized by using light and electron microscopy. The proposed specific epithet “variabilis” refers to the high variability in several morphological features exhibited and so far not reported in other species of the genus, such as marginal spines present or absent, areola openings surrounded by small spinules or by a complete silica ring, caverns at the valve face/mantle junction shallow or sometimes inconspicuous, and internal slits between the carinoportulae variably developed. Contrary, all characters of the girdle elements such as arrangement of poroids, presence of fimbriae and ligula, and valvocopula internal thickening are constant. The morphology of O. variabilis is compared to similar species and brief comments on the ecology of this taxon and the associated diatom flora are also presented. This is the first Orthoseira species established from Antarctica and from a sympagic environment.

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