Abstract
This study describes two new species of Plagiostriata: P. xiapuensis sp. nov. and P. pingtanensis sp. nov., both collected in the intertidal zone of Fujian Province, China. This is the first record of species in the genus Plagiostriata in China. The morphological characteristics of the two new species are discussed in detail using light and scanning electron microscopy. Plagiostriata xiapuensis sp. nov. is characterized by its lower stria density and simple volae-covered areolae compared to the higher stria density, small and complex volae–covered areolae in P. pingtanensis sp. nov. The morphological characteristics of these two species significantly differ from those of P. goreensis and P. baltica in sternum and areolae features, which is also discussed herein.
References
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<p>Vijver, B.V.D., Joachim Hürlimann, Williams, D.M., Levkov, Z., Wetzel, C.E. & Ector, L. (2021) <em>Fragilaria subrecapitellata</em> (Fragilariaceae, Bacillariophyta), a new diatom species from Switzerland.<em> Diatom Research</em> 36: 119–131. https://doi.org/10.1080/0269249X.2021.1942221</p>
<p>Chudaev, D., Jüttner, I. & Van de Vijver, B. (2021) <em>Fragilaria irregularis</em> sp. nov., a new araphid species (Fragilariaceae, Bacillariophyta) from the River Adegoy, Krasnodar Territory, Russia. <em>Phytotaxa</em> 508: 221–228. https://doi.org/10.11646/phytotaxa.508.2.11</p>
<p>Cox, E.J. & Ross, R. (1981) The striae of pennate diatoms. <em>In</em>: Ross, R. (Ed.) <em>Proceedings of the sixth symposium on recent and fossil diatoms</em>. Otto Koeltz Science Publishers, Koenigstein, pp. 267–278.</p>
<p>Cox, E.J. (1999) Studies on the diatom genus <em>Navicula </em>Bory. VIII. Variation in valve morphology in relation to the generic diagnosis based on <em>Navicula tripunctata </em>(O. F. Muller) Bory. <em>Diatom Research </em>14: 207–237. https://doi.org/10.1080/0269249X.1999.9705467</p>
<p>Kociolek, J.P., Kulikovskiy, M., Genkal, S. & Kuznetsova, I. (2017) Morphological investigation and transfer of <em>Naviculadicta parasemen</em> Lange-Bertalot to the genus <em>Rexlowea</em> Kociolek & Thomas. <em>Diatom Research</em> 32: 477–481. https://doi.org/10.1080/0269249X.2017.1403377</p>
<p>Krammer, K. & Lange-Bertalot, H. (1986) Bacillariophyceae, Teil 1: Naviculaceae, <em>In</em>: Ettl, H., Gerloff, J., Heynig, H. & Mollenhauer, D. (Eds.) <em>Süβwasserflora von Mitteleuropa</em>. 2/1. Gustav Fisher Verlag, Stuttgart, Jena, 876 pp.</p>
<p>Lange–Bertalot, H. (2001) <em>Navicula</em> sensu stricto. 10 genera separated from <em>Navicula</em> sensu lato. <em>Frustulia</em>.<em> In: </em>Lange-Bertalot, H. (Ed.) <em>Diatoms of Europe </em>2<em>. </em>A.R.G. Gantner Verlag K.G., Ruggell, 526 pp.</p>
<p>Li, C.L., Witkowski, A., Ashworth, M.P., Dąbek, P., Sato, S., Zgłobicka, I., Witak, M., Khim, J.S. & Kwon, C.J. (2018) The morphology and molecular phylogenetics of some marine diatom taxa within the Fragilariaceae, including twenty undescribed species and their relationship to <em>Nanofrustulum, Opephora </em>and <em>Pseudostaurosira. Phytotaxa</em> 355: 1–104. https://doi.org/10.11646/phytotaxa.355.1.1</p>
<p>Marquardt, G.C., Bicudo, D.C., Bicudo, C.E.M., Ledru, M.P., Ector, L. & Wetzel, C.E. (2021) <em>Pseudostaurosira crateri</em> sp. nov. (Fragilariaceae, Bacillariophyta), a new small araphid, fossil diatom species from the Pleistocene (Atlantic Forest, Brazil).<em> Phytotaxa </em>496: 105–120. https://doi.org/10.11646/phytotaxa.496.2.1</p>
<p>Medlin, L.K. & Desdevises, Y. (2016) Phylogeny of ‘Araphid’ diatoms inferred from SSU & LSU rDNA, rbcL & psbA sequences. <em>Vie et Milieu</em> 66 (2): 129–154.</p>
<p>National Marine Information Center (2018) Tide Table Query, China Maritime Service Network. Available from: https://www.cnss.com.cn/tide/ (accessed 19 May 2018)</p>
<p>Ross, R., Cox, E.J., Karayeva, N.I., Mann, D.G., Paddock, T.B.B., Simonsen, R. & Sims, P.A. (1979) An amended terminology for the siliceous components of the diatom cell. <em>Nova Hedwigia Beiheft </em>64: 511–533.</p>
<p>Round, F.E., Crawford, R.M. & Mann, D.G. (1990)<em> The diatoms. Biology and morphology of the genera. </em>Cambridge University Press, Cambridge, 747 pp.</p>
<p>Sato, S., Matsumoto, S. & Medlin, L.K. (2009) Fine structure and 18S rDNA phylogeny of a marine araphid pennate diatom <em>Plagiostriata goreensis</em> <em>gen. et sp. nov.</em> (Bacillariophyta). <em>Phycological Research</em> 57: 25–35. https://doi.org/10.1111/j.1440-1835.2008.00518.x</p>
<p>Sato, S., Nanjappa, D., Dorrell, R.G., Vieira, F., Kazamia, E., Tirichine, L., Veluchamy, A., Heilig, R., Aury, J.M. & Jaillon, O. (2020) Genome-enabled phylogenetic and functional reconstruction of an araphid pennate diatom <em>Plagiostriata</em> sp. CCMP470, previously assigned as a radial centric diatom, and its bacterial commensal.<em> Scientific Reports</em> 10:<strong> </strong>9449. https://doi.org/10.1038/s41598-020-65941-x</p>
<p>Vijver, B.V.D., Joachim Hürlimann, Williams, D.M., Levkov, Z., Wetzel, C.E. & Ector, L. (2021) <em>Fragilaria subrecapitellata</em> (Fragilariaceae, Bacillariophyta), a new diatom species from Switzerland.<em> Diatom Research</em> 36: 119–131. https://doi.org/10.1080/0269249X.2021.1942221</p>