Abstract
A new species of freshwater red algae, Sheathia jinchengensis, is described based on material collected from rocks in a clean and cold-water stream from the Jincheng region of Shanxi province in North China. Molecular sequences of rbcL and psbA genes were used to evaluate the phylogenetic relationship among samples of S. jinchengensis and other Sheathia species from several regions of the world. The results showed that S. jinchengensis formed an independent branch and separated from the previously published sequence data of other Sheathia taxa. From a morphological point of view, this new species differs also from other species of the genus by the smaller diameter of whorls (167.0–312.5 μm) and larger carpogonium diameter (17.0–29.0 μm). Comparison of sequence variation and thallus morphology with other Sheathia taxa resulted in the proposal of the new species—S. jinchengensis. Additionally, two endemic Batrachospermum species described earlier from China i.e., B. hongdongense and B. longipedicellata are now transferred to the genus Sheathia based on the present study as S. hongdongensis (S.L.Xie & J.Feng) Han, Nan, Feng, Lv, Liu, Kociolek et Xie comb. nov. and S. longipedicellata (Hua & Shi) Han, Nan, Feng, Lv, Liu, Kociolek et Xie comb. nov.
References
<p class="Reference">Chapuis, I.S., Necchi, Jr. O., Zuccarello, G.C., Xie, S.L., Aboal, M., Pedro, M.S.C. & Vis, M.L. (2017) A new genus, <em>Volatus</em> and four new species of <em>Batrachospermum</em> <em>sensu stricto </em>(Batrachospermales, Rhodophyta). <em>Phycologia</em> 56: 454–468.</p><p class="Reference"> https://doi.org/10.2216/16-73.1</p><p class="Reference">De Toni, G.B. (1897) <em>Sylloge algarum omnium hucusque cognitarum. Florideae Vol. IV</em>. Section I, Sumptibus auctoris, Padua, 388 pp.</p><p class="Reference">Entwisle, T.J., Vis, M.L., Chiasson, W.B., Necchi, Jr. O. & Sherwood, A.R. (2009) Systematics of the Batrachospermales (Rhodophyta)—a synthesis. <em>Journal of Phycology </em>45: 704–715.</p><p class="Reference"> https://doi.org/10.1111/j.1529-8817.2009.00686.x </p><p class="Reference">Evans, J.R., Chapuis, I.S. & Vis, M.L. (2017) Adding to the freshwater red algal diversity in North America: <em>Lympha mucosa</em> gen. <em>et sp. nov</em>. (Batrachospermales, Rhodophyta). <em>Algae</em> 32: 171–179.</p><p class="Reference"> https://doi.org/10.4490/algae.2017.32.9.8 </p><p class="Reference">Ganesan, E.K., West, J.A., Zuccarello, G.C., Göer, S.L.D. & Rout, J. (2015) <em>Lemanea manipurensis</em> <em>sp. nov. </em>(Batrachospermales), a freshwater red algal species from North-East India. <em>Algae</em> 30: 1–13.</p><p class="Reference"> https://doi.org/10.4490/algae.2015.30.1.001</p><p class="Reference">Hua, D. & Shi, Z.X. (1996) A new species of <em>Batrachospermum</em> from Jiangsu, China. <em>Acta Phytotaxonomica Sinica</em> 34: 324–325.</p><p class="Reference">Ji, J., Chen, L. & Xie, S.L. (2011) A molecular and morphological investigation of <em>Batrachospermum</em> <em>arcuatum</em> (Batrachospermales, Rhodophyta) in China. <em>Aquatic Botany</em> 95: 254–257.</p><p class="Reference"> https://doi.org/10.1016/j.aquabot.2011.08.001 </p><p class="Reference">Ji, L., Xie, S.L., Feng, J., Chen, L. & Wang, J. (2014) Molecular systematics of the four endemic Batrachospermaceae (Rhodophyta) species in China with multilocus data. <em>Journal of Plant Taxonomy</em> 52: 92–100.</p><p class="Reference"> https://doi.org/10.1111/jse.12058 </p><p class="Reference">Guiry, M.D. & Guiry, G.M. (2018) <em>AlgaeBase</em>. World-wide electronic publication, National Univesity of Ireland, Galway. Available from: http://www.algaebase.org (accessed 17 June 2018)</p><p class="Reference">Kumano, S. (2002)<em> Freshwater Red Algae of the World</em>. Biopress Ltd, Bristol, 375 pp.</p><p class="Reference">Nan, F.R., Feng, J., Han, X.J., Lv, J.P., Liu, Q. & Xie, S.L. (2016) Molecular identification of <em>Audouinella</em>-like species (Rhodophyta) from China based on three short DNA fragments. <em>Phytotaxa</em> 246 (2): 107–119.</p><p class="Reference"> https://doi.org/10.11646/phytotaxa.246.2.2</p><p class="Reference">Nan, F.R., Feng, J., Lv, J.P., Liu, Q.I. & Xie, S.L. (2017) <em>Hildenbrandia</em> <em>jigongshanensis</em> (Hildenbrandiaceae, Rhodophyta), a new freshwater species described from Jigongshan Mountain, China. <em>Phytotaxa</em> 292 (3): 243.</p><p class="Reference"> https://doi.org/10.11646/phytotaxa.292.3.4</p><p class="Reference">Ronquist, F. & Huelsenbeck, J.P. (2003) MrBayes 3: Bayesian phylogenetic inference under mixed models. <em>Bioinformatics</em> 19: 1572–1574.</p><p class="Reference"> https://doi.org/10.1093/bioinformatics/btg180</p><p class="Reference">Rossignolo, N.L. & Necchi, Jr. O. (2016) Revision of Section <em>Setacea</em> of the genus <em>Batrachospermum</em> (Batrachospermales, Rhodophyta) with emphasis on specimens from Brazil. <em>Phycologia</em> 55: 337–346.</p><p class="Reference"> https://doi.org/10.2216/15-144.1 </p><p class="Reference">Salomaki, E.D., Kwandrans, J., Eloranta, P. & Vis, M.L. (2014) Molecular and morphological evidence for <em>Sheathia</em> gen. nov. (Batrachospermales, Rhodophyta) and three new species. <em>Journal of Phycology</em> 50: 526–542.</p><p class="Reference"> https://doi.org/10.1111/jpy.12179</p><p class="Reference">Saunders, G.W. (2005) Applying DNA barcoding to red macroalgae: a preliminary appraisal holds promise for future applications. Philosophical transactions of the Royal Society B. <em>Biological sciences</em> 360: 1879–1888.</p><p class="Reference"> https://doi.org/10.1098/rstb.2005.1719 </p><p class="Reference">Shi, Z.X. (2006) <em>Flora algarum sinicarum aquae dulcis, Tomus Xiii, Rhodophyta, Phaeophyta</em>. 1st ed. Beijing Science Press, Beijing, 208 pp.</p><p class="Reference">Tamura, K., Peterson, D., Peterson, N., Stecher, G., Nei, M. & Kumar, S. (2011) MEGA5: molecular evolutionary genetics analysis using maximum likelihood, evolutionary distance, and maximum parsimony methods. <em>Molecular Biology and Evolution</em> 28: 2731–2739.</p><p class="Reference"> https://doi.org/10.1093/molbev/msr121</p><p class="Reference">Thompson, J.D., Gibson, T.J., Plewniak, F., Jeanmougin, F. & Higgins, D.G. (1997) The Clustal_X windows interface: flexible strategies for multiple sequence alignment aided by quality analysis tools. <em>Nucleic Acids research</em> 25: 4876–4882.</p><p class="Reference"> https://doi.org/10.1093/nar/25.24.4876</p><p class="Reference">Vis, M.L., Jr, N.O., Chiasson, W.B. & Entwisle, T.J. (2012) Molecular phylogeny of the genus <em>Kumanoa</em> (Batrachospermales, Rhodophyta). <em>Journal of Phycology</em> 48: 750–758.</p><p class="Reference"> https://doi.org/10.1111/j.1529-8817.2012.01141.x </p><p class="Reference">Vis, M.L. & Sheath, R.G. (1997) Biogeography of <em>Batrachospermum gelatinosum </em>(Batrachospermales, Rhodophyta) in North America based on molecular and morphological data. <em>Journal of Phycology</em> 33: 520–526.</p><p class="Reference"> https://doi.org/10.1111/j.0022-3646.1997.00520.x</p><p class="Reference">Vis, M.L., Saunders, G.W., Sheath, R.G., Dunse, K. & Entwisle, T.J. (1998) Phylogeny of the Batrachospermales (Rhodophyta) inferred from rbcL and 18S ribosomal DNA gene sequences. <em>Journal of Phycology</em> 34: 341–50.</p><p class="Reference"> https://doi.org/10.1046/j.1529-8817.1998.340341.x </p><p class="Reference">Vis, M.L., Sheath, R. & Cole, K. (1996) Distribution and systematics of <em>Batrachospermum</em> (Batrachospermales, Rhodophyta) in North America. 8b. Section <em>Batrachospermum</em>: previously described species excluding <em>Batrachospermum</em> <em>gelatinosum</em>. <em>British Phycological Bulletin</em> 31: 189–199.</p><p class="Reference"> https://doi.org/10.1080/09670269600651371 </p><p class="Reference">Vis, M.L., Sheath, R. & Entwisle, T. (1995) Morphometric analysis of <em>Batrachospermum</em> Section <em>Batrachospermum</em> (Batrachospermales, Rhodophyta) type specimens. <em>European Journal of Phycology</em> 30: 35–55.</p><p class="Reference"> https://doi.org/10.1080/09670269500650791 </p><p class="Reference">Xie, S.L. & Ling, Y.J. (2004) A taxonomic study of freshwater red algae from Shanxi province, North China. <em>Acta Botanica Boreali-Occidentalia Sinica</em> 24: 1489–1492.</p><p>Xie, S.L. & Feng, J. (2007) <em>Batrachospermum hongdongense</em> (Sect. <em>Batrachospermum</em>, Batrachospermaceae), a new species from Shanxi, China. <em>Botanical Studies</em> 48: 459–464.</p>