PhytoKeys (Sep 2024)

Ulnaria shun-biseriata sp. nov. (Bacillariophyta) from the Shun River in Hunan Province, China

  • Yan Zheng,
  • Bing Liu,
  • Patrick Rioual,
  • Ji-Yan Long,
  • Min Zhou

DOI
https://doi.org/10.3897/phytokeys.246.130942
Journal volume & issue
Vol. 246
pp. 315 – 327

Abstract

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A new species, Ulnaria shun-biseriata sp. nov., was found in the Shun River of Hunan Province, southern China, and its morphology was described based on light and scannning electron microscope obervations. Ulnaria shun-biseriata is characterized by its lanceolate valve outline, apiculate valve apices, slightly undulate valve margins, mostly biseriate striae, variable central area, and closed valvocopula. Many abnormal valves of U. shun-biseriata were observed in the samples investigated and the most frequent morphological abnormalities consisted of a lack of symmetry relative to the apical axis caused by a unilateral expansion in the middle part of the valve.