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Yuhang LI, Zhongmin SUN, Tamotsu NAGUMO, Kuidong XU. Two new marine benthic diatom species of Hippodonta (Bacillariophyceae) from the coast of China: H. nanjiensis sp. nov. and H. qingdaoensis sp. nov.[J]. Journal of Oceanology and Limnology, 2021, 39(3): 1033-1041

Two new marine benthic diatom species of Hippodonta (Bacillariophyceae) from the coast of China: H. nanjiensis sp. nov. and H. qingdaoensis sp. nov.

Yuhang LI1, Zhongmin SUN1, Tamotsu NAGUMO1,2, Kuidong XU1,3,4,5
1 Laboratory of Marine Organism Taxonomy and Phylogeny, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;
2 Echigo Natural History Laboratory, Kowada 719, Ojiya, Niigata 947-0041, Japan;
3 Laboratory for Marine Biology and Biotechnology, Pilot National Laboratory for Marine Science and Technology(Qingdao), Qingdao 266237, China;
4 University of Chinese Academy of Sciences, Beijing 100049, China;
5 Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China
The diversity and distribution of Hippodonta species on the coast of China are largely unknown due to limited investigations. In this paper, we report the detailed morphology and ultrastructure of two new species: H. nanjiensis sp. nov., collected from intertidal sandy sediments of Nanji Islands, the East China Sea and H. qingdaoensis sp. nov., collected from intertidal sandy sediments of the No. 1 Bathing Beach in Qingdao City, the Yellow Sea. Both species occur mainly in the middle part of the intertidal zone. H. nanjiensis possesses a unique large round central area. H. qingdaoensis differs from congeners in having a unique stria pattern, wherein the areolae in the middle transapical striae are less developed or absent on the primary side of the valve, and two areolae per stria are apparent under light microscopy (LM). This study expands our knowledge of Hippodonta diversity and distribution on the coast of China.
Key words:    Hippodonta|intertidal sediment|new species|Yellow Sea|East China Sea   
Received: 2020-02-27   Revised: 2020-04-06
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