Abstract
Epilithic diatoms form an important component of the benthos in freshwater rivers. As part of a study on the epilithic diatoms in rivers from Hunan and Guizhou Provinces, central China, two new Oricymba species, O. sinensis sp. nov. and O. fanjingensis sp. nov., were observed using light and scanning electron microscopy. Oricymba sinensis possesses a conspicuous dorsiventrality, which differs from other Oricymba species. Moreover, O. sinensis has very shallow grooves along either side of each marginal ridge and higher areola density than other Oricymba species. Oricymba fanjingensis has a unique combination of characters that includes apiculate apices of the valve, distinct grooves along either side of the marginal ridge, and a valve surface ridge parallel to its adjacent marginal ridge. This surface ridge is observed for the first time in Oricymba. The valve external and internal ultrastructure is clearly established for these two new species. In particular, their apical pore fields possess internal apertures of each pervalvar row of foramina that are covered by an undulate flap-like silica strip, which does not completely occlude the internal apertures. Some species of the genera Cymbella and Delicatophycus have a similar internal structure in the apical pore field. Thus, the ultrastructure of the apical pore fields should be considered an important distinguishing feature for Cymbelloid diatoms and is worth investigating systematically.
References
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<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;"><span lang="en-GB">Glushchenko, A.M. & Kulikovskiy, M.S. (2017) </span><span lang="en-GB"><em>Amphipleura vavilovii</em></span><span lang="en-GB">: A new diatom species of the family Amphipleuraceae from Laos[J]. </span><span lang="en-GB"><em>Inland Water Biology</em></span><span lang="en-GB"> 10 (1): 17–21. https://doi.org/10.1134/S1995082916040064 </span></span></span></span></p>
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<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;"><span lang="en-GB">Krammer, K. (2002) </span><span lang="en-GB"><em>Cymbella</em></span><span lang="en-GB">.</span><span lang="en-GB"><em> In: Diatoms of Europe, diatoms of the European inland waters and comparable habitats (Lange-Bertalot, H. Ed.). Vol. 3. </em></span><span lang="en-GB">Ruggell: A.R.G. Gantner Verlag K.G. pp. 1–584.</span></span></span></span></p>
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<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;"><span lang="en-GB">Le Cohu, R., Lange-Bertalot, H., Van de Vijver, B. & Tudesque, L. (2020) Analysis and critical evaluation of structural features in four Cymbellaceae taxa from New Caledonia. </span><span lang="en-GB"><em>Fottea </em></span><span lang="en-GB">20 (1): 75–85. https://doi.org/10.5507/fot.2019.017</span></span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;"><span lang="en-GB">Lyngbye, H.C. (1819) </span><span lang="en-GB"><em>Tentamen Hydrophytologiae Danicae Continens omnia Hydrophyta Cryptogama Daniae, Holsatiae, Faeroae, Islandiae, Groenlandiae hucusque cognita, Systematice Disposita, Descripta et iconibus illustrata, Adjectis Simul Speciebus Norvegicis</em></span><span lang="en-GB">. Hafniae, Typis Schultzianis, in commissis Librariae Gyldendaliae, Copenhague, 248 pp. </span></span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;"><span lang="en-GB">Liu, B., Blanco, S., Long, H., Xu, J. & Jiang, X. (2016) </span><span lang="en-GB"><em>Achnanthidium sinense sp. nov.</em></span><span lang="en-GB"> (Bacillariophyta) from the Wuling Mountains Area, China. </span><span lang="en-GB"><em>Phytotaxa</em></span><span lang="en-GB"> 284 (3): 194–202. http://dx.doi.org/10.11646/phytotaxa.284.3.4 </span></span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;"><span lang="en-GB">Liu, B., Williams, D.M., Li, Y. & Tang, Z.S. (2020) Two new species of </span><span lang="en-GB"><em>Cymbella</em></span><span lang="en-GB"> (Bacillariophyceae) from China, with comments on their valve dimensions. </span><span lang="en-GB"><em>Diatom Research</em></span><span lang="en-GB"> 35: 99–111. https://doi.org/10.1080/0269249X.2020.1733100</span></span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;"><span lang="en-GB">Liu, B., Zhou, Y.Y., Blanco, S. & Williams, D.M. (2022) Three new species of </span><span lang="en-GB"><em>Delicatophycus</em></span><span lang="en-GB"> M.J. Wynne (Bacillariophyta) from China, all possessing apical pore fields. </span><span lang="en-GB"><em>Fottea</em></span><span lang="en-GB"> 22 (1): 137–151. http://dx.doi.org/10.5507/fot.2021.020</span></span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;"><span lang="en-GB">Radhakrishnan, C., Kulikovskiy, M., Glushchenko, A., Kuznetsova, I., Kociolek, P. & Karthick, B. (2018) </span><span lang="en-GB"><em>Oricymba sagarensis</em></span><span lang="en-GB"> (Gandhi) comb. nov., an endemic diatom from the Western Ghats, India. </span><span lang="en-GB"><em>Phytotaxa</em></span><span lang="en-GB"> 382 (3): 267–274. http://dx.doi.org/10.11646/phytotaxa.382.3.3</span></span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;"><span lang="en-GB">Zhang, W., Li, Y.L., Kociolek, J.P., Zhang, R.L. & Wang, L.Q. (2015) </span><span lang="en-GB"><em>Oricymba tianmuensis</em></span> <span lang="en-GB"><em>sp. nov.</em></span><span lang="en-GB">, a new cymbelloid species (Bacillariophyceae) from Tianmu Mountain in Zhejiang Province, China. </span><span lang="en-GB"><em>Phytotaxa</em></span><span lang="en-GB"> 236 (3): 257–265. http://dx.doi.org/10.11646/phytotaxa.236.3.6</span></span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;"><span lang="en-GB">Zhang, W., Qi, X., Kociolek, J.P., Wang, L.Q. & Zhang, R.L. (2016) </span><span lang="en-GB"><em>Oricymba xianjuensis</em></span> <span lang="en-GB"><em>sp. nov.</em></span><span lang="en-GB">, a new freshwater diatom (Bacillariophyceae) from Xianju National Park (Zhejiang Province, China). </span><span lang="en-GB"><em>Phytotaxa</em></span><span lang="en-GB"> 272 (2): 134–140. http://dx.doi.org/10.11646/phytotaxa.272.2.4</span></span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;"><span lang="en-GB">Zhang, W., Shang, G.X., Kociolek, J.P., Wang, L.Q. & Zhang, R.L. (2018) </span><span lang="en-GB"><em>Oricymba rhynchocephala</em></span> <span lang="en-GB"><em>sp. nov.</em></span><span lang="en-GB">, a new cymbelloid diatom (Bacillariophyceae) from Xianju National Park in Zhejiang Province, China. </span><span lang="en-GB"><em>Phytotaxa </em></span><span lang="en-GB">340 (1): 63–70. https://doi.org/10.11646/phytotaxa.340.1.4 </span></span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;"><span lang="en-GB">Wynne, M.J. (2019) </span><span lang="en-GB"><em>Delicatophycus </em></span><span lang="en-GB">gen. nov: a validation of “</span><span lang="en-GB"><em>Delicata </em></span><span lang="en-GB">Krammer” inval. (Gomphonemataceae, Bacillariophyta). </span><span lang="en-GB"><em>Notulae Algarum</em></span><span lang="en-GB"> 97: 1–3.</span></span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;"><span lang="en-GB">Bory de Saint-Vincent, J.B.G.M. (1822) Bacillariées. </span><span lang="en-GB"><em>Dictionnaire Classique d'Histoire naturelle</em></span><span lang="en-GB"> 2: 127–129. </span></span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;"><span lang="en-GB">Compère, P. (2001) </span><span lang="en-GB"><em>Ulnaria</em></span><span lang="en-GB"> (Kützing) Compère, a new genus name for </span><span lang="en-GB"><em>Fragilaria</em></span><span lang="en-GB"> subgen. </span><span lang="en-GB"><em>Alterasynedra</em></span><span lang="en-GB"> Lange-Bertalot with comments on the typification of </span><span lang="en-GB"><em>Synedra</em></span><span lang="en-GB"> Ehrenberg.</span><span lang="en-GB"><em> In:</em></span><span lang="en-GB"> Jahn, R., Kociolek, J.P., Witkowski, A. & Compère, P. (Eds.)</span><span lang="en-GB"><em> Lange-Bertalot Festschrift. Studies on diatoms dedicated to Prof. Dr. Dr. h.c. Horst Lange-Bertalot on the occasion of his 65th birthday</em></span><span lang="en-GB">. A.R.G. Gantner Verlag K.G., Ruggell, pp. 97–101. </span></span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;"><span lang="en-GB">Czarnecki, D.B. (1994) The freshwater diatom culture collection at Loras College, Dubuque, Iowa.</span><span lang="en-GB"><em> Memoirs of the California Academy of Sciences</em></span><span lang="en-GB"> 17: 155–174. </span></span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;"><span lang="en-GB">Ehrenberg, C.G. (1832) </span><span lang="en-GB"><em>Über die Entwickelung und Lebensdauer der Infusionsthiere; nebst ferneren Beiträgen zu einer Vergleichung ihrer organischen Systeme</em></span><span lang="en-GB">. Abhandlungen der Königlichen Akademie Wissenschaften zu Berlin, Physikalische Klasse, pp. 1–154.</span></span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;"><span lang="en-GB">Gandhi, H.P. (1959) Fresh-water diatoms from Sagar in the Mysore State. </span><span lang="en-GB"><em>Journal of the Indian Botanical Society</em></span><span lang="en-GB"> 38: 305–331.</span></span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;"><span lang="en-GB">Glushchenko, A.M. & Kulikovskiy, M.S. (2017) </span><span lang="en-GB"><em>Amphipleura vavilovii</em></span><span lang="en-GB">: A new diatom species of the family Amphipleuraceae from Laos[J]. </span><span lang="en-GB"><em>Inland Water Biology</em></span><span lang="en-GB"> 10 (1): 17–21. https://doi.org/10.1134/S1995082916040064 </span></span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;"><span lang="en-GB">Guiry, M.D. & Guiry, G.M. (2022) AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. Available from: http://www.algaebase.org (accessed 11 Nov. 2022) </span></span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;"><span lang="en-GB">Guo, J.S., Meng, W.W., He, X.Y., Zhang, Y., Li, Y.L. & Kociolek, J.P. (2021) </span><span lang="en-GB"><em>Oricymba gongshanensis</em></span> <span lang="en-GB"><em>sp. nov.</em></span><span lang="en-GB"> (Cymbellaceae, Bacillariophyceae), a new species from southwest China. </span><span lang="en-GB"><em>Phytotaxa</em></span><span lang="en-GB"> 508 (1): 39–48. https://doi.org/10.11646/phytotaxa.508.1.3 </span></span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;"><span lang="en-GB">Jüttner, I., Krammer, K., Van de Vijver, B., Tuji, A., Simkhada, B., Gurung, S. & Cox, E.J. (2010) </span><span lang="en-GB"><em>Oricymba</em></span><span lang="en-GB"> (Cymbellales, Bacillariophyceae), a new cymbelloid genus and three new species from the Nepalese Himalaya. </span><span lang="en-GB"><em>Phycologia</em></span><span lang="en-GB"> 49: 407–423. https://doi.org/10.2216/09-77.1</span></span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;"><span lang="en-GB">Kasputin, D.A., Glushchenko, A.M., Kociolek, J.P. & Kulikovskiy, M.S. (2021) </span><span lang="en-GB"><em>Encyonopsis indonesica sp. nov.</em></span><span lang="en-GB"> (Bacillariophyceae, Cymbellales), a new diatom from the ancient lake Matano (Sulawesi, Indonesia). </span><span lang="en-GB"><em>PhytoKeys </em></span><span lang="en-GB">175: 1–11. https://doi.org/10.3897/phytokeys.175.61044</span></span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;"><span lang="en-GB">Krammer, K. (2002) </span><span lang="en-GB"><em>Cymbella</em></span><span lang="en-GB">.</span><span lang="en-GB"><em> In: Diatoms of Europe, diatoms of the European inland waters and comparable habitats (Lange-Bertalot, H. Ed.). Vol. 3. </em></span><span lang="en-GB">Ruggell: A.R.G. Gantner Verlag K.G. pp. 1–584.</span></span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;"><span lang="en-GB">Kulikovskiy, M., Glushchenko, A. & Kociolek, J.P. (2015) The diatom genus </span><span lang="en-GB"><em>Oricymba</em></span><span lang="en-GB"> in Vietnam and Laos with description of one newspecies and a consideration of its systematic position. </span><span lang="en-GB"><em>Phytotaxa</em></span><span lang="en-GB"> 227 (2): 120–134. https://doi.org/10.11646/phytotaxa.227.2.2</span></span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;"><span lang="en-GB">Kuntze, C.E.O. (1898) </span><span lang="en-GB"><em>Revisio generum Plantarum Vascularium secundum leges nomenclaturale internationales cum enumeration Plantarum Exoticarum.</em></span><span lang="en-GB"> vol.3, pt. 2. A. Felix, Leipzig, pp. 375–1011. https://doi.org/10.5962/bhl.title.327 </span></span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;"><span lang="en-GB">Le Cohu, R., Lange-Bertalot, H., Van de Vijver, B. & Tudesque, L. (2020) Analysis and critical evaluation of structural features in four Cymbellaceae taxa from New Caledonia. </span><span lang="en-GB"><em>Fottea </em></span><span lang="en-GB">20 (1): 75–85. https://doi.org/10.5507/fot.2019.017</span></span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;"><span lang="en-GB">Lyngbye, H.C. (1819) </span><span lang="en-GB"><em>Tentamen Hydrophytologiae Danicae Continens omnia Hydrophyta Cryptogama Daniae, Holsatiae, Faeroae, Islandiae, Groenlandiae hucusque cognita, Systematice Disposita, Descripta et iconibus illustrata, Adjectis Simul Speciebus Norvegicis</em></span><span lang="en-GB">. Hafniae, Typis Schultzianis, in commissis Librariae Gyldendaliae, Copenhague, 248 pp. </span></span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;"><span lang="en-GB">Liu, B., Blanco, S., Long, H., Xu, J. & Jiang, X. (2016) </span><span lang="en-GB"><em>Achnanthidium sinense sp. nov.</em></span><span lang="en-GB"> (Bacillariophyta) from the Wuling Mountains Area, China. </span><span lang="en-GB"><em>Phytotaxa</em></span><span lang="en-GB"> 284 (3): 194–202. http://dx.doi.org/10.11646/phytotaxa.284.3.4 </span></span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;"><span lang="en-GB">Liu, B., Williams, D.M., Li, Y. & Tang, Z.S. (2020) Two new species of </span><span lang="en-GB"><em>Cymbella</em></span><span lang="en-GB"> (Bacillariophyceae) from China, with comments on their valve dimensions. </span><span lang="en-GB"><em>Diatom Research</em></span><span lang="en-GB"> 35: 99–111. https://doi.org/10.1080/0269249X.2020.1733100</span></span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;"><span lang="en-GB">Liu, B., Zhou, Y.Y., Blanco, S. & Williams, D.M. (2022) Three new species of </span><span lang="en-GB"><em>Delicatophycus</em></span><span lang="en-GB"> M.J. Wynne (Bacillariophyta) from China, all possessing apical pore fields. </span><span lang="en-GB"><em>Fottea</em></span><span lang="en-GB"> 22 (1): 137–151. http://dx.doi.org/10.5507/fot.2021.020</span></span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;"><span lang="en-GB">Radhakrishnan, C., Kulikovskiy, M., Glushchenko, A., Kuznetsova, I., Kociolek, P. & Karthick, B. (2018) </span><span lang="en-GB"><em>Oricymba sagarensis</em></span><span lang="en-GB"> (Gandhi) comb. nov., an endemic diatom from the Western Ghats, India. </span><span lang="en-GB"><em>Phytotaxa</em></span><span lang="en-GB"> 382 (3): 267–274. http://dx.doi.org/10.11646/phytotaxa.382.3.3</span></span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;"><span lang="en-GB">Zhang, W., Li, Y.L., Kociolek, J.P., Zhang, R.L. & Wang, L.Q. (2015) </span><span lang="en-GB"><em>Oricymba tianmuensis</em></span> <span lang="en-GB"><em>sp. nov.</em></span><span lang="en-GB">, a new cymbelloid species (Bacillariophyceae) from Tianmu Mountain in Zhejiang Province, China. </span><span lang="en-GB"><em>Phytotaxa</em></span><span lang="en-GB"> 236 (3): 257–265. http://dx.doi.org/10.11646/phytotaxa.236.3.6</span></span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;"><span lang="en-GB">Zhang, W., Qi, X., Kociolek, J.P., Wang, L.Q. & Zhang, R.L. (2016) </span><span lang="en-GB"><em>Oricymba xianjuensis</em></span> <span lang="en-GB"><em>sp. nov.</em></span><span lang="en-GB">, a new freshwater diatom (Bacillariophyceae) from Xianju National Park (Zhejiang Province, China). </span><span lang="en-GB"><em>Phytotaxa</em></span><span lang="en-GB"> 272 (2): 134–140. http://dx.doi.org/10.11646/phytotaxa.272.2.4</span></span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;"><span lang="en-GB">Zhang, W., Shang, G.X., Kociolek, J.P., Wang, L.Q. & Zhang, R.L. (2018) </span><span lang="en-GB"><em>Oricymba rhynchocephala</em></span> <span lang="en-GB"><em>sp. nov.</em></span><span lang="en-GB">, a new cymbelloid diatom (Bacillariophyceae) from Xianju National Park in Zhejiang Province, China. </span><span lang="en-GB"><em>Phytotaxa </em></span><span lang="en-GB">340 (1): 63–70. https://doi.org/10.11646/phytotaxa.340.1.4 </span></span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;"><span lang="en-GB">Wynne, M.J. (2019) </span><span lang="en-GB"><em>Delicatophycus </em></span><span lang="en-GB">gen. nov: a validation of “</span><span lang="en-GB"><em>Delicata </em></span><span lang="en-GB">Krammer” inval. (Gomphonemataceae, Bacillariophyta). </span><span lang="en-GB"><em>Notulae Algarum</em></span><span lang="en-GB"> 97: 1–3.</span></span></span></span></p>