Surirella suiningensis Bing Liu & D.M. Williams, 2022
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publication ID |
https://dx.doi.org/10.3897/phytokeys.201.79626 |
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persistent identifier |
https://treatment.plazi.org/id/1C8F581F-CFCE-50B3-89E4-441817CD6A05 |
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treatment provided by |
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scientific name |
Surirella suiningensis Bing Liu & D.M. Williams |
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sp. nov. |
Surirella suiningensis Bing Liu & D.M. Williams sp. nov.
Figs 5 View Figure 5 , 6 View Figure 6 , 7 View Figure 7 , 8 View Figure 8
Holotype.
Holotype BM! 81893, specimen circled on slide, illustrated as Fig. 5B View Figure 5 ; isotype JIU! G202107, specimen circled on slide, illustrated as Fig. 5A View Figure 5 .
Type locality.
China. Hunan Province: the course of Wu River, a sampling point at Changpu Town, Suining County, 26°34.59'N, 110°09.19'E, 300 m a.s.l., collected by Bing Liu, March 22, 2021.
Description.
LM (Fig. 5 View Figure 5 ). Valves narrowly ovate, heteropolar, with downward deflecting head and foot poles; headpole broadly rounded whereas footpole narrowly rounded. Valve dimensions (n = 8): 148-173 μm long, 49-55 μm wide (measured at widest valve part). Valve face appearing smooth, without undulations and costae. Valve midline straight, downward deflecting at each apex. Fibulae very distinctive, parallel in valve middle part, radiate at two apices, 20-24 in 100 μm. Fibulae extending from mantle towards midline, spanning 70-80% of half valve width except near each apex where few fibulae nearly meet at median line.
SEM (Figs 6 View Figure 6 - 8 View Figure 8 ). Valve smooth, canal raphe system located around valve margins, slightly raised (Fig. 6A View Figure 6 ). Median line slightly raised, continuous from pole to pole, downward deflecting at both apices (Fig. 6A View Figure 6 ). Valve surface producing shallow troughs and higher crests (Fig. 6A, B View Figure 6 ), and troughs alternating with crests from pole to pole. Costae (thickened siliceous ribs) absent (Fig. 6B View Figure 6 ). Each trough corresponding to its internal fibula, each crest composed of c. 16-27 uniseriate striae (Fig. 6B, E View Figure 6 ). Distal raphe endings curved (Fig. 6C, D View Figure 6 ). Mantle with same pattern as valve surface, troughs align with each other (Fig. 6E View Figure 6 ). Internally, fibulae evident, extending from mantle to median line, spanning 70-80% of half valve width. Striae uniseriate, 47-51 in 10 μm. External openings of areolae slit-like (Fig. 6B View Figure 6 ) while internal openings rounded and rimmed (Fig. 7D View Figure 7 ). One portula and 16-27 uniseriate striae located between two adjacent fibulae (Fig. 7B View Figure 7 ). Sinking of mantle against fibulae present (Fig. 7C View Figure 7 ). Raphe continuous at one apex whereas interrupted at other apex (Figs 7E View Figure 7 , 8B View Figure 8 ). Valvocopula open (Fig. 8A, C View Figure 8 ) and rimmed areolae internally (Fig. 8D View Figure 8 ).
Etymology.
Named after Suining County of Hunan Province, where the species was found.
Ecology and distribution.
Epilithic in a mountain river with oligotrophic waters. Surirella suiningensis was found in the same sampling site with S. wufluminensis , for the environmental parameters, see above.
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.
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