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Medaeops Guinot, 1967 (Brachyura, Xanthidae) from China seas, with the resurrection of Medaeops japonicus (Rathbun, 1898)

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Abstract

The xanthid genus Medaeops Guinot, 1967 currently contains seven species reported from the Indo-West Pacific region. However, only one species, Medaeops granulosus (Haswell, 1882), has been recorded from China seas and was once thought to be widespread in the Indo-West Pacific region. In this study, two species of the Medaeops granulosus species-group were identified during the analysis on Medaeops crabs from China seas. Medaeops japonicus (Rathbun, 1898), which had previously been considered a junior synonym of M. granulosus, is shown to be a distinct species that can be distinguished from M. granulosus by the lower first anterolateral tooth, the larger and concentrated granules on carapace dorsally, and the different shape of the male’s first gonopod. In addition, a new recorded species, Medaeops edwardsi Guinot, 1967, was reported from China seas for the first time. A molecular analysis was conducted to determine the status of each species, and an updated key for species of the genus Medaeops was provided.

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Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Acknowledgment

We would like to thank Dong DONG, Junlong ZHANG (Institute of Oceanology, Chinese Academy of Science), and Juhao WANG and Xu ZHANG for the specimen collection, and Jian CHEN and Xingle GUO (Zhejiang Ocean University) for kindly providing the Zhoushan specimens. We are also very grateful to Juhao WANG and Xu ZHANG from Institute of Zoology, Chinese Academy of Sciences for providing photos of live crabs. We would like to thank Wei LIU and Yuanyuan SUN (Institute of Oceanology, Chinese Academy of Science) for their help in the SEM observation.

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Authors and Affiliations

  1. Laboratory of Marine Organism Taxonomy and Phylogeny, Qingdao Key Laboratory of Marine Biodiversity and Conservation, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China

    Ziming Yuan, Wei Jiang & Zhongli Sha

  2. Shandong Province Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China

    Wei Jiang & Zhongli Sha

  3. Laoshan Laboratory, Qingdao, 266237, China

    Wei Jiang & Zhongli Sha

  4. University of Chinese Academy of Sciences, Beijing, 100049, China

    Ziming Yuan

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  1. Ziming Yuan
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Correspondence to Zhongli Sha.

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Supported by the National Natural Science Foundation of China (No. 42176138), the Ministry of Science and Technology of China (No. 2021YFF0502801), the Strategic Priority Research Program of Chinese Academy of Sciences (No. XDB42000000), and the National Key R&D Program of China (No. 2018YFD0900804)

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Yuan, Z., Jiang, W. & Sha, Z. Medaeops Guinot, 1967 (Brachyura, Xanthidae) from China seas, with the resurrection of Medaeops japonicus (Rathbun, 1898). J. Ocean. Limnol. 41, 2403–2417 (2023). https://doi.org/10.1007/s00343-023-2282-7

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