Abstract
This study presents a new flattened species of Meristotheca collected from southern Viet Nam. Meristotheca lysonensis sp. nov. is proposed based upon several morphological characters and genetic differences when compared to the closely related species documented in Southeast Asia: M. procumbens. This new species shows larger size and blade thickness, as well as both basal and lateral pit-connections between tetrasporangia and the parental supporting cells. The phylogenetic analyses also support Meristotheca lysonensis as a new species.
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;">Borlongan, I.A., Terada, R. and Hurtado, A. (2021) Concise review of the genus <em>Meristotheca</em> (Rhodophyta: Solieriaceae). <em>Journal of Applied Phycology</em> 33: 167–181. https://doi.org/10.1007/s10811-020-02288-w</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Dam, D.T. & Do, H.C. (2016) Species composition and distribution of seaweeds from some small islands (Nam Yet, Son Ca, Song Tu Tay, Sinh Ton) of Truong Sa Archipelago. <em>Vietnam Journal of Marine Science and Technology</em> 16: 297–305. https://doi.org/10.15625/1859-3097/16/3/8124</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Darriba, D., Taboada, G.L., Doallo, R. & Posada, D. (2012) jModelTest 2: More models, new heuristics and parallel computing. <em>Nature Methods</em> 9: 772–772. https://doi.org/10.1038/nmeth.2109</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Faye, E.J., Kogame, K., Shimada, S., Kawaguchi, S. & Masuda, M. (2007) Taxonomic features of the red alga <em>Meristotheca coacta</em> (Solieriaceae, Gigartinales). <em>Phycological Research</em> 55: 150–158. https://doi.org/10.1111/j.1440-1835.2007.00458.x</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Faye, E.J., Kogame, K., Shimada, S., Kawaguchi, S. & Masuda, M. (2008) New red alga <em>Meristotheca imbricata</em> (Solieriaceae, Gigartinales) from Japan. <em>Phycological Research</em> 56: 115–126. https://doi.org/10.1111/j.1440-1835.2008.00492.x</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Faye, E.J., Shimada, S., Kawaguchi, S. & Masuda, M. (2005) Characterization of the edible red alga <em>Meristotheca papulosa </em>(Solieriaceae, Gigartinales) from Japan. <em>Phycological Research</em> 53: 234–245. https://doi.org/10.1111/j.1440-183.2005.00391.x</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Faye, E.J., Shimada, S., Kogame, K. & Masuda, M. (2004) A new red algal species <em>Meristotheca dakarensis </em>(Solieriaceae, Gigartinales) from Senegal, western Africa, with comments on the relegation of <em>Meristiella </em>Cheny to synonymy with <em>Meristotheca </em>J. Agardh. <em>Cryptogamie Algologie</em> 25: 241–259.</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Freshwater, D.W. & Rueness, J. (1994) Phylogenetic relationships of some European <em>Gelidium</em> (Gelidiales, Rhodophyta) species, based on <em>rbc</em>L nucleotide sequence analysis. <em>Phycologia</em> 33: 187–194. https://doi.org/10.2216/i0031-8884-33-3-187.1</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Gabrielson, P.W. & Kraft, G.T. (1984) The marine algae of Lord Howe Island (N.S.W.): The family Solieriaceae (Gigartinales, Rhodophyta). <em>Brunonia</em> 7: 217–251. https://doi.org/10.1071/BRU9840217</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Guiry, M.D. & Guiry, G.M. (2022) AlgaeBase. World-wide electronic publication. National University of Ireland, Galway. Available from: http://www.algaebase.org (Accessed 22 March 2022)</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Kang, J.C. & Kim, M.S. (2013) A novel species <em>Symphyocladia glabra </em>sp. nov. (Rhodomelaceae, Rhodophyta) from Korea based on morphological and molecular analyses. <em>Algae </em>28: 149–160. https://doi.org/10.4490/algae.2013.28.2.149</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Katoh, K. & Standley, D.M. (2013) MAFFT multiple sequence alignment software version 7: improvements in performance and usability. <em>Molecular Biology and Evolution</em> 30: 772–780. https://doi.org/10.1093/molbev/mst010</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Kumar, S., Stecher, G., Li, M., Knyaz, C. & Tamura, K. (2018) MEGA X: Molecular evolutionary genetics analysis across computing platforms. <em>Molecular Biology and Evolution</em> 35: 1547–1549. https://doi.org/10.1093/molbev/msy096</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Le, H.N., Muangmai, N., Kheauthong, S., Sun, Z. & Zuccarello, G.C. (2020) <em>Gracilaria phuquocensis </em>sp. nov., a new flattened <em>Gracilaria </em>species (Gracilariales, Rhodophyta), previously recognized as <em>G. mammillaris</em>, from the southern coast of Vietnam. <em>Phycological Research</em> 68: 50–56. https://doi.org/10.1111/pre.12394</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Le, N.H., Bui, M.L., Tran, V.H. & Vo, T.T. (2015) New records of marine algae in Vietnam. <em>Ocean Science Journal</em> 50: 221–229. https://doi.org/10.1007/s12601-015-0019-z</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">N’Yeurt, A.D. (1995) <em>Meristotheca procumbens</em> P. Gabrielsonet <em>et</em> Kraft (Gigartinals, Solieriaceae): An edible seaweed from Rotuma Island. <em>South Pacific Journal of Natural Science</em> 14: 243–250.</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Nguyen-Nhat, N.-T., Dao, V.-H. & Nguyen, X.V. (2019) New record of the rare brown alga <em>Dictyota hauckiana</em> from Vietnam. <em>Botanica Marina</em> 62: 599–603. https://doi.org/10.1515/bot-2019-0024</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Nguyen, H.D. & Pham, H.T. (2003) Some new records of marine algae from Vietnam. <em>Collection of Marine Research Works</em> 13: 95–104.</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Nguyen, H.D., Pham, H.T. & Nguyen, X.V. (2009) Species composition and resources of seaweed and seagrass of Phu Quy Island, Binh Thuan province. <em>Collection of Marine Research Works</em> 16: 225–243. </span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Nguyen, V.T., Le, N.H., Lin, S.M., Steen, F. & De Clerck, O. (2013) Checklist of the marine macroalgae of Vietnam. <em>Botanica Marina</em> 56: 207–227. https://doi.org/10.1515/bot-2013-0010</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Nguyen, X.V., Nguyen-Nhat, N.T., Nguyen, T.X.T., Nguyen, T.M.N., Dao, V.H. & McDermid, K.J. (2021) Three new records of marine macroalgae from Viet Nam based on morphological observations and molecular analyses. <em>Pacific Science</em> 75: 497–512. https://doi.org/10.2984/75.4.3</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Núñez-Resendiz, M.L., Dreckmann, K.M. & Sentíes, A. (2017) <em>Meristotheca cylindrica </em>sp. nov. (Solieriaceae, Rhodophyta) from the southern Gulf of Mexico. <em>Phycologia</em> 56: 423–429. https://doi.org/10.2216/16-116.1</span></span></span></p>
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