Ultrastructure of four Surirella taxa (Bacillariophyceae) from Qinghai Province, northwest China, with reference to the characteristics of portulae

JI-YAN LONG; BING LIU; PATRICK RIOUAL; BIN YANG; MIN ZHOU

doi:10.11646/phytotaxa.592.2.11

Issue: Vol. 592 No. 2: 18 April 2023

Type: Article

Published: 2023-04-18

DOI: 10.11646/phytotaxa.592.2.11

Page range: 163-177

Abstract views: 65

PDF downloaded: 4

**Ultrastructure of four Surirella taxa (Bacillariophyceae) from Qinghai Province, northwest China, with reference to the characteristics of portulae**

JI-YAN LONG⁺⁻
BING LIU⁺⁻
PATRICK RIOUAL⁺⁻
BIN YANG⁺⁻
MIN ZHOU⁺⁻

College of Biology and Environmental Sciences, Jishou University, Jishou 416000, China

Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, P.O. box 9825, Beijing 100029, China. CAS Center for Excellence in Life and Paleoenvironment, Beijing 100044, China.

College of Biology and Environmental Sciences, Jishou University, Jishou 416000, China

canal raphe fibula portula pseudoseptum Surirella liubingii Algae

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Abstract

During our investigations on the freshwater diatoms from Qinghai Province, China, four sympatric Surirella taxa belonging to the group Pinnatae were analysed. Based on morphological observations derived from light and scanning electron microscopy, three of these four taxa were identified as: S. minuta, S. lacrimula, and S. brebissonii var. kuetzingii. The fourth taxon is described as Surirella liubingii sp. nov., a new species with a unique combination of characteristics. These include the distribution pattern of its costa-stria bundles (CSBs) alternating with its over-fibula costae (OFCs), which is formed by the distinctly elevated CSBs on the valve face, mostly composed of three costae, and OFCs with a remarkedly lower position. Other characteristics include the presence of robust fibulae extending to the valve midline, the presence of only one portula between two adjacent fibulae, and a “pseudoseptum” extending internally from the valve margin. From the observations on these four Surirella taxa, we described and discussed two types of fibula (one in which the fibula nearly reaches the valve midline and one with short fibula) and two types of portula morphology (one with only one portula between two adjacent fibulae and the other with 2–4 portulae between two adjacent fibulae).

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