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Two new freshwater species of the genus Achnanthidium (Bacillariophyta, Achnanthidiaceae) from Qingxi River, China
Yu, P.; You, Q.; Pang, W.; Wang, Q. (2022). Two new freshwater species of the genus Achnanthidium (Bacillariophyta, Achnanthidiaceae) from Qingxi River, China. PhytoKeys 192: 11-28. https://dx.doi.org/10.3897/phytokeys.191.78489
In: PhytoKeys. PENSOFT PUBL. ISSN 1314-2011; e-ISSN 1314-2003, more
Peer reviewed article  

Available in  Authors 

Keyword
    Bacillariophyceae [WoRMS]
Author keywords
    Diatoms; monoraphid; morphology; new species; taxonomy

Authors  Top 
  • Yu, P.
  • You, Q.
  • Pang, W., more
  • Wang, Q.

Abstract
    We describe two new Achnanthidium species, A. anhuense sp. nov. and A. qingxiense sp. nov., from Qingxi River, Anhui Province, China, based on light and scanning electron microscopy. Both species belong to the “A. pyrenaicum complex” of the Achnanthidium genus, based on their possession of transapically-elongated areolae and deflected external distal raphe fissures. A. anhuense sp. nov. has a slightly irregular linear-lanceolate valve with rounded or weakly protracted apices and a transapically rectangular or bow tie central area on the raphe valve. A. qingxiense sp. nov. has a linear-lanceolate valve with rounded apices and the axial area distinct expanded apices on the rapheless valve. Both species differ sufficiently from other similar species, based on valve outline, shape of the axial and central areas and striae density. These new species were all collected from stone substratum.

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