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A new dinoflagellate species, Protoperidinium smithii H. Doan-Nhu, L. Phan-Tan et L. Nguyen-Ngoc sp. nov., and an emended description of Protoperidinium defectum (Balech 1965) Balech 1974 from the Ross Sea, Antarctica

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The Ross Sea is one of the most well studied marginal seas in Antarctica. However, information of phytoplankton and in particular dinoflagellate diversity is limited. In this present study, samples at the surface and depth of the chlorophyll maximum at 40 stations during summer (2011–2012) were investigated for Protoperidinium species. A new species has described: Protoperidinium smithii H. Doan-Nhu, L. Phan-Tan et L. Nguyen-Ngoc sp. nov. This species belongs to subgenus Minusculum and have all of the features of this group. The new species is similar to Protoperidinium bipes (Paulsen) Balech 1974 and Protoperidinium defectum (Balech) Balech 1974. However, it is clearly differentiated from both species by its cell body shape, very short right antapical spine, a short apical horn, and the largest 1′′′ plate among species in subgenus Minusculum. Protoperidinium defectum is also amended by several characteristics including detail plates tabulation since the first description in 1965.

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H. Doan-Nhu and W.O. Smith were supported by the US National Science Foundation (Grant ANT-0944254). L. Nguyen-Ngoc, L. Phan-Tan and H. Doan-Nhu were supported by Viet Nam National Foundation for Science and Technology Development (Grant Number: DFG 106-NN.06-2016.78) and L. Phan-Tan was support by post-doctoral project from Graduate University of Science and Technology, Viet Nam (Grant Number: GUST.STS.ĐT2017-KHB01). The authors thank Dr. Mona Hoppenrath, German Centre for Marine Biodiversity Research, and Dr. Aika Yamaguchi, Kobe University, Japan, for their constructive comments on the new species description. We thank the crew members and scientists of the RVIB Nathaniel B. Palmer and PRISM during our cruise, as well as the support of Raytheon technicians and McMurdo staff in sending samples to Viet Nam. We thank Mr. Sebastien Flotow, Leibniz Center for Tropical Marine Research (Germany) for technical assistance in using Scanning Electron Microscope. This is VIMS contribution number 3723.

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Correspondence to H. Doan-Nhu.

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Phan-Tan, L., Nguyen-Ngoc, L., Smith, W.O. et al. A new dinoflagellate species, Protoperidinium smithii H. Doan-Nhu, L. Phan-Tan et L. Nguyen-Ngoc sp. nov., and an emended description of Protoperidinium defectum (Balech 1965) Balech 1974 from the Ross Sea, Antarctica. Polar Biol 41, 983–992 (2018). https://doi.org/10.1007/s00300-018-2262-0

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  • Protoperidinium smithii
  • New species
  • Protoperidinium defectum
  • Dinoflagellates
  • Ross Sea
  • Antarctica