Mallomonas paragrandis E.S. Gusev sp. nov. is described from Zua River, located in Khanh Hoa Province, Central Viet Nam. The description is based on silica-scale morphology studied by means of transmission and scanning electron microscopy. New species has oval or obovoid scales with evenly distributed large pores in proximal half of the scales. Distal part is covered with hexagonal reticulation with minute pores inside each mesh and papillae in the angles of the meshes. New species belongs to the Section Planae and closely related to Mallomonas sorohexareticulata Jo, Shin, Kim, Siver & Andersen, M. hexareticulata Jo, Shin, Kim, Siver & Andersen and M. matvienkoae Asmund & Kristiansen var. grandis Dürrschmidt & G. Cronberg. Results of morphological comparison were approved by molecular analysis on the basis of nuclear 18S and 28S rDNA and plastid rbcL genes.

Keywords: Synurales, Mallomonas, new species, morphological and molecular studies

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1. Asmund B. and Kristiansen J., Opera Bot., 1986, 85:1-128.
2. Dürrschmidt M. and Cronberg G., Algol. Stud., 1989, 54:15-37.
3. Gusev E.S., Nova Hedw. Beih., 2013, 142:87-95.
4. Gusev E.S., Phytotaxa, 2012, 66:1-5.
5. Gusev E.S., Phytotaxa, 2015, 195(4):291-296. https://doi.org/10.11646/phytotaxa.195.4.4
6. Jo B.Y., Shin W., Boo S.M., Kim H.S., and Siver P.A., J. Phycol., 2011, 47:415-425. https://doi.org/10.1111/j.1529-8817.2010.00953.x
7. Jo B.Y., Shin W., Kim H.S., Siver P.A., and Andersen R.A., Phycologia, 2013, 52:266-278. https://doi.org/10.2216/12-107.1
8. Kim H.S. and Kim J.H., Nord. J. Bot., 2010, 2:350-353. https://doi.org/10.1111/j.1756-1051.2009.00600.x
9. Kim H.S. and Kim, J.H., Nova Hedw., 2008, 86:469-476. https://doi.org/10.1127/0029-5035/2008/0086-0469
10. Kim H.S., Kim J.H., Shin W., and Jo B.Y., Nova Hedw., 2014, 98:89-102. https://doi.org/10.1127/0029-5035/2013/0138
11. Kristiansen J. and Preisig H.R., Süsswasserflora von Mitteleuropa (Freshwater flora of Central Europe). 1/2, Springer Verlag, Berlin, 2007, 252 S.
12. Ma C.X. and Wei Y.X., Nova Hedw., 2013, 96:457-462. https://doi.org/10.1127/0029-5035/2013/0095
13. McFadden G.I. and Melkonian M., Phycologia, 1986, 25:551-557. https://doi.org/10.2216/i0031-8884-25-4-551.1
14. Ronquist F. and Huelsenbeck J.P., Bioinformatics, 2003, 19:1572-1574. https://doi.org/10.1093/bioinformatics/btg180
15. Škaloud P., Kristiansen J., and Škaloudová M., Nord. J. Bot., 2013, 31:385-402. https://doi.org/10.1111/j.1756-1051.2013.00119.x
16. Tamura K., Stecher G., Peterson D., Filipski A., and Kumar S., Mol. Biol. and Evol., 2013, 30:2725-2729. https://doi.org/10.1093/molbev/mst197