Pinnularia hupingensis Bing Liu & Rioual, 2024
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publication ID |
https://dx.doi.org/10.3897/phytokeys.237.116946 |
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persistent identifier |
https://treatment.plazi.org/id/DBA7073E-78DB-5FB8-B8CC-E8962E5C6CA1 |
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treatment provided by |
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scientific name |
Pinnularia hupingensis Bing Liu & Rioual |
| status |
sp. nov. |
Pinnularia hupingensis Bing Liu & Rioual sp. nov.
Figs 1 View Figure 1 , 2 View Figure 2 , 3 View Figure 3 , 4 View Figure 4 , 5 View Figure 5
Holotype.
Slide DIA202316, specimen circled on the slide, illustrated here as Fig. 2B View Figure 2 , deposited in the Herbarium of Jishou University (JIU), China. Registration: http://phycobank.org/104258.
Type locality.
China. Hunan Province, Shimen County, Huping Town, a sampling site (29°57'6"N, 110°45'37"E, 230 m a.s.l.) in a riffle of the Xie River, collected by Bing Liu, 14 March 2021.
Description.
LM (Figs 1 View Figure 1 , 2 View Figure 2 ). Living cells rectangular in girdle view (Fig. 1A-C View Figure 1 ), linear with rounded apices in valve view (Fig. 1D-G View Figure 1 ). Two girdle-appressed, plate-like chloroplasts per cell (Fig. 1D-G View Figure 1 ). Valves linear with weakly undulate valve margins and broadly rounded apices. Valve dimensions (n = 28): length 28-65 μm, width 6.3-8.4 μm. Axial area narrow, raphe slightly undulate, filiform. Central pores small and bent towards the primary side and distal raphe fissures hooked. Central area very large (ca. 4.5-11.2 μm long), hexagonal, reaching both margins, occupying ca. 1/5-1/8 of the valve length. Striae extremely divergent, strongly radiate in the valve centre, becoming strongly convergent halfway to the apices. Striae 13-14 in 10 μm measured in the middle part of the valve near the central area. Voigt faults sometimes present on the secondary side (Fig. 2A, E, G, H View Figure 2 , arrows). Apical hyaline areas well-developed.
SEM (Figs 3 View Figure 3 - 5 View Figure 5 ). Valves linear with broadly rounded apices and flat surface, curving smoothly into relatively deep mantles (Fig. 3A, B View Figure 3 ). The valve primary and secondary sides can be recognised by the presence of Voigt faults on the secondary side (Fig. 3A, B View Figure 3 ). Central area very large, with two central pores both bent towards the primary side (Fig. 3A-C View Figure 3 ). Internally, proximal raphe endings interrupted by the central nodule, both turning towards the primary side (Fig. 4A-C View Figure 4 ). The external distal raphe fissures curved (Fig. 3A, B, D, E View Figure 3 ) while the internal distal raphe fissures run into a small, knob-like helictoglossa (Fig. 4D, E View Figure 4 ). Apical hyaline areas present (Figs 3D, E View Figure 3 , 4D, E View Figure 4 ). Each alveolate stria comprises 3-5 rows of small rounded poroids externally (Fig. 3C-F View Figure 3 ) and internally, openings consist of elongate apertures (Fig. 4F View Figure 4 , two double-headed arrows). Valvocopula has the same outline as that of the valve and is composed of pars interior, suture and pars exterior (Fig. 5A, B View Figure 5 ). Pars exterior ornamented by a row of elongate poroids (Fig. 5A View Figure 5 , white arrows, Fig. 5B View Figure 5 , white wavy arrows). Valvocopula closed at one apex and open at the other (Fig. 5C, D View Figure 5 ).
Etymology.
The specific epithet hupingensis refers to Huping Town where the species was found.
Distribution and ecology.
Known only from the type locality in which it is a common species with ca. 4% relative abundance. The samples that included this species were scraped off surface of stones collected in the Xie River. Hence, this is a benthic, epilithic species. The associated taxa include Navicula reinhardtii Grunow, N. radiosa Kützing, Ulnaria hupingensis Bing Liu, U. xieriverensis Bing Liu and many unidentified Cymbella spp., Fragilaria spp., Gomphonema spp., amongst others. The following environmental parameters were measured in the field with three replications: Conductivity = 236.3 ± 1.2 μS cm-1; pH = 8.49 ± 0.02; Water temperature = 13.6 ± 0.1 °C.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.