A new monotypic diatom genus Chinia gen. nov. from estuarine mangrove habitats in Fujian, China is described. Light, scanning and transmission electron microscopy observations of its morphology show that this diatom differs from any established raphid diatom genus. The new genus is distinguished by a strongly undulate valve face, eccentric raphe canal, and perforated copulae. Its distinctly elevated and perforated raphe canal, classified as simonsenioid type, is supported by sparse infundibulum-like portulae, and the portulae are separated by large fenestrae. The valves of Chinia also have hymenate areolar occlusions and the raphe lacks a central nodule. However, unlike most Bacillariaceae with two plastids, including Simonsenia , Chinia has a single plastid similar to those in Entomoneis and Surirella . Despite the similarities to Simonsenia , Chinia features porous raphe canal and loose striation, which is different from those of Simonsenia that has a solid raphe canal and distinct rows of areolae. These distinctive cytological and morphological characters suggest an affinity of the new genus to the Bacillariaceae.

Huina LIN;Weiwei WU;Lin SUN;Andrzej WITKOWSKI;Xiaoye LI;Vishal PATIL;Junrong LIANG;Xuesong LI;Yahui GAO;Changping CHEN

School of Life Sciences and Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems,Xiamen University,Xiamen 361102,China;State Key Laboratory of Marine Environmental Science,Xiamen University,Xiamen 361102,China;Institute of Marine and Environmental Sciences,University of Szczecin,Mickiewicza 16a,PL-70-383 Szczecin,Poland

海洋湖沼学报（英文版）

[1]Huina LIN;Weiwei WU;Lin SUN;Andrzej WITKOWSKI;Xiaoye LI;Vishal PATIL;Junrong LIANG;Xuesong LI;Yahui GAO;Changping CHEN-.Chinia gen. nov.—the second diatom genus simonsenioid raphe from mangroves in Fujian, China)[J].海洋湖沼学报（英文版）,2022(03):1220-1232

Chinia,simonsenioid,raphid,undulate,copulae,infundibulum,portulae,fenestrae,hymenate,areolar,Bacillariaceae,plastids,Simonsenia,Entomoneis,striation,areolae

nov,second,diatom,genus,raphe,from,mangroves,Fujian,China,new,monotypic,estuarine,habitats,described,Light,scanning,transmission,electron,microscopy,observations,its,morphology,show,that,this,differs,any,established,distinguished,by,strongly,face,eccentric,canal,perforated,Its,distinctly,elevated,classified,type,supported,sparse,separated,large,valves,also,have,occlusions,lacks,central,nodule,However,unlike,most,two,including,has,single,those,Surirella,Despite,similarities,features,porous,loose,which,different,solid,rows,These,distinctive,cytological,morphological,characters,suggest,affinity

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