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11 December 2019 Three New Species of Ulnaria (Kützing) Compère (Bacillariophyta) from China, with Reference to the Fine Structure of Their Valvocopula
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Three new species of Ulnaria (Kützing) Compère are described based on light and scanning electric microscopy observations. Ulnaria oxybiseriata D.M. Williams & Bing Liu, sp. nov., has linear-lanceolate to lanceolate valves with apiculate and produced ends, biseriate striae, and a central area mostly forming an incomplete fascia surrounded by shortened striae on one side. Ulnaria jinbianensis S. Blanco & Bing Liu, sp. nov., bears linear-lanceolate valves with rostrate to subrostrate ends in larger valves and cuneate ends in smaller valves, uniseriate stria, and a central area forming a rectangular to trapezoid fascia. Ulnaria dongtingensis Bing Liu, sp. nov., possesses a narrow-lanceolate valve outline with produced rostrate to capitate ends, uniseriate stria, and a central area forming almost square fascia. The valvocopula of all three new species bears the same ultrastructure: 1) a complete valvocopula is a closed ring with the same shape as the valve outline, closely attached to the mantle interior surrounding the valve margin; 2) each valvocopula present a row of poroids which bisects the pars interior and exterior; 3) valvocopula with sawtooth-shaped projections attached to the valve over virgae internally; and 4) the valvocopula closed and hyaline at both apices. All three species were found in alkaline freshwater (around pH 8) with moderate conductivity (c. 102-221 µS/cm).

© Publications scientifiques du Muséum national d'Histoire naturelle, Paris.
Bing Liu, David M. Williams, Saúl Blanco, Zhu-Xiang Liu, and Dan Liu "Three New Species of Ulnaria (Kützing) Compère (Bacillariophyta) from China, with Reference to the Fine Structure of Their Valvocopula," Cryptogamie, Algologie 40(11), 119-139, (11 December 2019).
Received: 14 November 2018; Accepted: 15 May 2019; Published: 11 December 2019

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