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Issue: Vol. 748 No. 2: 20 Mar. 2026
Type: Article
Published: 2026-03-20
DOI: 10.11646/phytotaxa.748.2.7
Page range: 230-236
Abstract views: 0
PDF downloaded: 0

Mallomonas decipiens sp. nov. (Synurales, Chrysophyceae)—a new unique species from Vietnam

Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Leninsky Prospect 33, 119071 Moscow, Russia
Papanin Institute for Biology of Inland Waters, Russian Academy of Sciences, Borok, 109, 152742, Yaroslavl Region, Russia
Institute for Cellular and Intracellular Symbiosis, Orenburg Federal Research Center, Ural Branch, Russian Academy of Sciences, Pionerskaya Street, 11, 460000, Orenburg, Russia
Joint Vietnam-Russia Tropical Science and Technology Research Center, Coastal branch, 30 Nguyen Thien Thuat, Nha Trang 57000, Vietnam
Mallomonas new species scale ultrastructure section Papillosae Synurales tropics Algae

Abstract

A new species, Mallomonas decipiens sp. nov., is described from Vietnam based on silica-scale morphology observed using scanning and transmission electron microscopy. Mallomonas decipiens belongs to section Papillosae and is most similar to M. korshikovii, M. delanciana and M. verrucosa. Scales of M. decipiens have a shallow elongated dome, which is recessed from the distal margin, papillae on the dome and anterior flanges, and the open reticulation on the shield. Bristles of the newly described species are short, with a bifurcated apex and a flattened foot. The new species has been found in eight localities in six provinces from the northern to the southern parts of Vietnam.

References

  1. Asmund, B. & Kristiansen, J. (1986) The genus Mallomonas (Chrysophyceae). A taxonomic survey based on the ultrastructure of silica scales and bristles. Opera Botanica 85: 1–128.
  2. Compère, P. (1974) Mallomonas bronchartiana, Chrysophyceé nouvelle du lac Tchad. Bulletin du Jardin botanique national de Belgique 44: 61–63. https://doi.org/10.2307/3667427
  3. Cronberg, G. (1989) Scaled chrysophytes from the tropics. Nova Hedwigia Beiheft 95: 191–232.
  4. Dürrschmidt, M. (1982) Mallomonas parvula sp. nov. and Mallomonas retifera sp. nov. (Chrysophyceae, Synuraceae) from South Chile. Canadian Journal of Botany 60 (5): 651–656. https://doi.org/10.1139/b82-086
  5. Dürrschmidt, M. & Cronberg, G. (1989) Contribution to the knowledge of tropical Chrysophytes: Mallomonadaceae and Paraphysomonadaceae from Sri Lanka. Archiv für Hydrobiologie Supplement 82/1 (Algological Studies 54): 15–37.
  6. Dürrschmidt, M. & Croome, R. (1985) Mallomonadaceae (Chrysophyceae) from Malaysia and Australia. Nordic Journal of Botany 5: 285–298. https://doi.org/10.1111/j.1756-1051.1985.tb01657.x
  7. Gusev, E.S. (2012) A new species of the genus Mallomonas (Synurophyceae), Mallomonas spinosa sp. nov., from Vietnam. Phytotaxa 66: 1–5. https://doi.org/10.11646/phytotaxa.66.1.1
  8. Gusev, E.S. (2013) Studies on synurophycean algae from mangrove wetlands (Vietnam). Nova Hedwigia, Beiheft 142: 87–95.
  9. Gusev, E.S. (2015) A new species of the genus Mallomonas (Synurales, Chrysophyceae), Mallomonas fimbriata sp. nov. Phytotaxa 195 (4): 291–296. https://doi.org/10.11646/phytotaxa.195.4.4
  10. Gusev, E.S. & Kulikovskiy, M.S. (2020) Two new species of genus Mallomonas from swamp localities in Vietnam. Phytotaxa 461 (1): 121–129. https://doi.org/10.11646/phytotaxa.468.1.8
  11. Gusev, E. & Martynenko, N. (2022) Diversity of Silica‐Scaled Chrysophytes in Central Vietnam. Water 14: 1–21. https://doi.org/10.3390/w14010065
  12. Gusev, E.S. & Siver, P.A. (2017) Mallomonas neoampla sp. nov. from Vietnam, a new species that bridges the gap between fossil and modern taxa. Nova Hedwigia, Beihefte 104: 521–528. https://doi.org/10.1127/nova_hedwigia/2016/0389
  13. Gusev, E.S. & Kulikovskiy, M.S. (2020) Two new species of genus Mallomonas from swamp localities in Vietnam. Phytotaxa 468: 121–129. https://doi.org/10.11646/phytotaxa.468.1.8
  14. Gusev, E., Doan-Nhu, H., Nguyen-Ngoc, L. & D.A. Kapustin (2016) Two new species of the genus Mallomonas from the Cat Tien National Park (Viet Nam): Mallomonas distinguenda and Mallomonas skvortsovii. Phytotaxa 273 (1): 59–64. https://doi.org/10.11646/phytotaxa.273.1.6
  15. Gusev, E.S., Doan-Nhu, H. & Nguyen-Ngoc, L. (2017a) Silica-scaled chrysophytes from Cat Tien National Park (Dong Nai Province, Vietnam). Nova Hedwigia, Beihefte 105: 347–364. https://doi.org/10.1127/nova_hedwigia/2017/0416
  16. Gusev, E.S., Siver, P.A. & Shin, W. (2017b) Mallomonas bronchartiana Compère revisited: Two new species described from Asia. Cryptogamie Algologie 38: 3–16. https://doi.org/10.7872/crya/v38.iss1.2017.3
  17. Gusev, E.S., Kapustin, D.A., Martynenko, N.A., Guseva, E.E. & Kulikovskiy, M.S. (2019a) Mallomonas gusakovii sp. nov. (Chrysophyceae, Synurales), a new species from Phu Quoc Island, Vietnam. Phytotaxa 406: 199–205. https://doi.org/10.11646/phytotaxa.406.3.6
  18. Gusev, E., Kulizin, P., Guseva, E., Shkurina, N. & Kulikovskii, M. (2019b) Mallomonas lamii sp. nov. (Synurales, Chrysophyceae), a new species bearing large scales described from the tropics. Phytotaxa 423: 266–272. https://doi.org/10.11646/phytotaxa.423.4.5
  19. Gusev, E., Martynenko, N. & Tran, H. (2021a) Studies on Algae from the Order Synurales (Chrysophyceae) in Northern Vietnam. Diversity 13: 602. https://doi.org/10.3390/d13110602
  20. Gusev, E., Kezlya, E., Tran, H. & Kulikovskiy, M. (2021b) Mallomonas vietnamica Gusev, Kezlya & Tran, sp. nov. (Synurales, Chrysophyceae), a new species, that shares some features with fossil taxa. Cryptogamie, Algologie 42 (3): 39–46. https://doi.org/10.5252/cryptogamie-algologie2021v42a3
  21. Gusev, E., Kapustin, D., Martynenko, N. & Kulikovskiy, M. (2022a) Diversity of silica-scaled chrysophytes (Stramenopiles: Chrysophyceae) from Indonesian Papua. Diversity 14: 726. https://doi.org/10.3390/d14090726
  22. Gusev, E., Martynenko, N., Kapustin, D., Doan-Nhu, H. & Nguyen-Ngoc, L. (2022b) Diversity of silica-scaled chrysophytes of two tropical islands: Phu Quoc and Con Son (Viet Nam). Life 12: 1611. https://doi.org/10.3390/life12101611
  23. Gusev, E., Martynenko, N., Shkurina, N., Phan, T.H., Tran, D.D. & Nguyen, T.H.T. (2023a) An annotated checklist of algae from the order Synurales (Chrysophyceae) of Viet Nam. Diversity 15: 183. https://doi.org/10.3390/d15020183
  24. Gusev, E., Shkurina, N. & Huan, P.T. (2023b) Mallomonas acidophila sp. nov. (Synurales, Chrysophyceae)—a new species from the tropics with morphological features of fossil taxa. Phytotaxa 620: 157–166. https://doi.org/10.11646/phytotaxa.620.2.3
  25. Gusev, E.S., Ignatenko, M.E., Lituanas, C.R., Gumapac, K.R., Martynenko, N.A. & Efeykin, B.D. (2025) Diversity of silica-scaled chrysophytes (Chrysophyceae) from Mindanao Island (Philippines) with the description of Mallomonas pseudopustula sp. nov. PhytoKeys 268: 81–102. https://doi.org/10.3897/phytokeys.268.176758
  26. Gusev, E.S., Safronova, T.V., Podunay, Y.A., Tran, H., Mohagan, A.B. & Martynenko, N.A. (2026) Morphological and molecular studies of Mallomonas species from section Multisetigerae (Chrysophyceae, Synurales) with description of a new species. PhytoKeys 269: 79–98. https://doi.org/10.3897/phytokeys.269.179128
  27. Hansen, P. (1996) Silica-scaled Chrysophyceae and Synurophyceae from Madagascar. Archiv für Protistenkunde l47: 145–172. https://doi.org/10.1016/S0003-9365(96)80030-3
  28. Ignatenko, M., Nguyen-Ngoc, L., Phan, T.H. & Gusev, E.S. (2024) A new species of the genus Mallomonas from section Marsupiales from Viet Nam. Phytotaxa 675 (3): 283–291. https://doi.org/10.11646/phytotaxa.675.3.7
  29. Kapustin, D.A. & Gusev, E.S. (2019) Silica-scaled chrysophytes from West Java (Indonesia) including description of a new Chrysosphaerella species. Nova Hedwigia Beiheft 148: 11–20. https://doi.org/10.1127/nova-suppl/2019/025
  30. Kristiansen, J. (2002) The genus Mallomonas (Synurophyceae)—a taxonomic survey based on the ultrastructure of silica scales and bristles. Opera Botanica 139: 5–218.
  31. Perty, M. (1852) Zur Kenntniss kleinster Lebensformen nach Bau, Funktionen, Systematik, mit Specialverzeichniss der in der Schweiz beobachteten. Jent & Reinert, Bern, 228 pp.
  32. Siver, P.A. (1991) The biology of Mallomonas: morphology, taxonomy, and ecology. Kluwer Academic Publishers, Dordrecht, 228 pp. https://doi.org/10.1007/978-94-011-3376-0
  33. Siver, P.A. (2002) Two new taxa in the Section Papillosae of the genus Mallomonas (Synurophyceae) from the Ocala National Forest, Florida, USA. Nordic Journal of Botany 22: 123–128. https://doi.org/10.1111/j.1756-1051.2002.tb01628.x
  34. Siver, P.A. (2022) The downsizing of gigantic scales and large cells in the genus Mallomonas (Synurales, Chrysophyceae). Scientific Reports 12: 4896. https://doi.org/10.1038/s41598-022-09006-1
  35. Siver, P.A. (2024) Mallomonas gigantica sp. nov., an Eocene synurophyte possessing the largest known siliceous scales. Fottea 24 (2): 261–268. https://doi.org/10.5507/fot.2024.006
  36. Siver, P.A. & Lott, A.M. (2012) Fossil species of Mallomonas from an Eocene Maar Lake with recessed dome structures: Early attempts securing bristles to the cell covering? Nova Hedwigia, Beiheft 95: 517–529. https://doi.org/10.1127/0029-5035/2012/0057
  37. Takahashi, E. & Hayakawa, T. (1979) The Synuraceae (Chrysophyceae) from Bangladesh. Phykos (Algiers) 18: 129–147.
  38. Vigna, M. (1981) Estudio con microscopio electronico de barrido de nuevos taxones de la familia Synuraceae (Chrysophyceae). Physis. Sección B 39: 15–20.
  39. Wei, Y.-X. & Yuan, X.-P. (2001) Studies on silica-scaled chrysophytes from the tropics and subtropics of China. Nova Hedwigia Beiheft 122: 169–187.
  40. Wei, Y.-X., Yuan, X.-P. & Kristiansen, J. (2014) Silica-Scaled Chrysophytes from Hainan, Guangdong Provinces and Hong Kong Special Administrative Region, China. Nordic Journal of Botany 32: 881–896. https://doi.org/10.1111/njb.00493
  41. Wujek, D.E. & Saha, L.C. (1996) Scale-bearing chrysophytes (Chrysophyceae and Synurophyceae) from India. II. Nova Hedwigia Beiheft 112: 367–377.

How to Cite

Gusev, E.S., Shkurina, N.A., Ignatenko, M.E. & Huan, P.T. (2026) Mallomonas decipiens sp. nov. (Synurales, Chrysophyceae)—a new unique species from Vietnam. Phytotaxa 748 (2): 230–236. https://doi.org/10.11646/phytotaxa.748.2.7