Two new marine benthic diatom species of Hippodonta (Bacillariophyceae) from the coast of China: H. nanjiensis sp. nov.
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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 3
Echigo Natural History Laboratory, Kowada 719, Ojiya, Niigata 947-0041, Japan 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
Received Feb. 27, 2020; accepted in principle Apr. 6, 2020; accepted for publication Jul. 22, 2020 © Chinese Society for Oceanology and Limnology, Science Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract 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. Keyword: Hippodonta; intertidal sediment; new species; Yellow Sea; East China Sea
1 INTRODUCTION The genus Hippodonta Lange-Bertalot, Metzeltin et Witkowski in Lange-Bertalot et al. (1996) was established and separated from Navicula Bory sensu lato based on its characters of a simple raphe system without an accessory rib, transapically elongated and cap-like terminal areas, and external raphe distal endings not or weakly deflected without extending to the valve mantle (Witkowski et al., 2000; Pavlov et al., 2013). Lange-Bertalot et al. (1996) described ten new Hippodotna species and transferred 11 species into this genus, which included eight species from coastal areas. Later, three new species from coastal areas were added to the genus (Witkowski et al., 2000; Potapova, 2013; Zhao et al., 2017). In contrast to these coastal species, most species of Hippodonta have been described from (ancient) lakes and rivers in various continents (Metzeltin et al., 2005; Blanco et
al., 2012; Kulikovskiy et al., 2012; Van de Vijver et al., 2012; Pavlov et al., 2013; Peng et al., 2014). Presently, 95 species are included in the genus Hippodonta (Guiry 2020), of whic
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