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Li Lang,Chen Changping,Sun Lin,Zhang Jiawei,Liang Junrong,Gao Yahui. 2020. Protoraphis Simonsen, a newly recorded marine epizoic diatom genus for China. Acta Oceanologica Sinica, 39(4):120-126
Protoraphis Simonsen, a newly recorded marine epizoic diatom genus for China
中国海洋动表生硅藻的新记录属——原缝藻属(Protoraphis Simonsen)
Received:December 16, 2018  
DOI:10.1007/s13131-019-1467-z
Key words:marine epizoic diatom  copepod  Protoraphis  newly recorded genus  ear-shaped process
中文关键词:  海洋动表生硅藻  桡足类  原缝藻属  新记录属  耳状结构
基金项目:The National Key Research and Development Program of China under contract No. 2016YFA0601302; the National Natural Science Foundation of China under contract Nos 41876146 and 41476116.
Author NameAffiliationE-mail
Li Lang School of Life Sciences, Xiamen University, Xiamen 361102, China  
Chen Changping School of Life Sciences, Xiamen University, Xiamen 361102, China
Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University, Xiamen 361102, China 
chencp@xmu.edu.cn 
Sun Lin State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361102, China  
Zhang Jiawei School of Life Sciences, Xiamen University, Xiamen 361102, China  
Liang Junrong School of Life Sciences, Xiamen University, Xiamen 361102, China
Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University, Xiamen 361102, China 
 
Gao Yahui School of Life Sciences, Xiamen University, Xiamen 361102, China
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 
gaoyh@xmu.edu.cn 
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Abstract:
      Epizoic diatoms on marine copepods are common in nature and may have a special ecological relationship with their hosts. However, this special ecological group is not well known, and it has only rarely been studied in the China seas. To address this knowledge gap, the species diversity and classification of epizoic diatoms on planktonic copepods were studied with samples collected from the East China Sea. In the present study, a marine araphid diatom genus Protoraphis and its type species, Pr. hustedtiana, were observed and identified by light and electron microscopy, thus representing the first record of this genus and its type species in China. This genus is characterized by a median sternum strongly bent to opposite sides and terminate in two transapical grooves at the valve ends. Protoraphis hustedtiana was found to be epizoic on the posterior body appendages and segments of the marine calanoid copepod Candacia bradyi. An internal view shows a complex, ear-shaped process that is close to the apical slit field. The ecological habitats and geographical distributions of Protoraphis were also discussed, and, together with complementary morphological studies, our results have increased the number of records for marine epizoic diatoms to three genera with three species in China, including Pseudohimantidium and Pseudofalcula.
中文摘要:
      生活在海洋桡足类上的动表生硅藻在自然界中普遍存在,且与桡足类之间可能存在着复杂的生态关系。然而,这一特殊类群一直没有引起足够的重视,在中国海域的分布更不明确。为了填补国内研究在此方面的认知空缺,我们对采自东海的浮游桡足类上的动表生硅藻进行了物种多样性和分类研究。本研究通过光学显微镜和电子显微镜观察并鉴定到了中国新记录的1个海洋无壳缝类硅藻属原缝藻属(Protoraphis)及其模式种胡氏原缝藻(Pr. hustedtiana)。该属的主要特征为拟壳缝明显,中部直且两端向相反方向强烈弯曲并终止于近壳端处的横沟。胡氏原缝藻附着于海洋哲水蚤伯氏平头水蚤(Candacia bradyi)体表靠后的部位,该藻的内壳面存在一个毗邻于顶孔区的耳状结构。本研究结合形态学,讨论了原缝藻属的生境和地理分布。本研究结果将中国海洋动表生硅藻的记录增加到3属3种,包括了假带状藻属(Pseudohimantidium)和伪镰刀藻属(Pseudofalcula)。
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