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The caudal appendix as an important character to identify various species in the genus Stenalpheops (Decapoda, Alpheidae)

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The nominal genera Chelomalpheus Kim, 1998 and Cavipelta Hayashi, 1998 were treated as synonyms of Stenalpheops Miya, 1997 in the paper by Anker et al. (2001). Therefore, the type species of those genera (Chelomalpheus koreanus Kim, 1998 and Cavipelta yamashitai Hayashi, 1998, respectively) were synonymized with S. anacanthus Miya, 1997. Actually, those authors ignored that the morphological characters of the three species mentioned above show differences. For instance, all type specimens of Chelomalpheus koreanus Kim, 1998 are without a caudal appendix; the large male specimens of Cavipelta yamashitai Hayashi, 1998 have an abnormal shaped chela, which corresponds with the middle stage in a growth series of another nominal species, i.e., S. anacanthus. The opportunity to study abundant specimens from the China seas established that the type specimens of S. anacanthus Miya, 1997 are in fact composed of two species, and the same was found for the type specimens of Cavipelta yamashitai Hayashi, 1998; in addition, Chelomalpheus koreanus Kim, 1998 was found to be a valid species and is transferred to Stenalpheops; and S. crangonus (Anker, Jeng & Chan, 2001) is herein synonymized with S. anacanthus Miya, 1997, which name has priority, and this valid species is now re-described herein.

Affiliations: 1: 1Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China ; 2: 2University of Chinese Academy of Sciences, Beijing 100049, China

3Corresponding author; e-mail:

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1. Anker A., Jeng M. S., Chan T. Y., 2001. "Two unusual species of Alpheidae (Decapoda: Caridea) associated with upogebiid mudshrimps in the mudflats of Taiwan and Vietnam". Journal of Crustacean Biology, Vol 21(4): 1049-1061. [Crossref]
2. De Grave S., Fransen C. H. J. M., 2011. "Carideorum catalogus: the recent species of the dendrobranchiate, stenopodidean, procarididean and caridean shrimps (Crustacea: Decapoda)". Zoologische Mededelingen, Leiden, Vol 89(5): 195-589.
3. Hayashi K. I., 1998. "A new genus and a new species of alpheid shrimp (Decapoda, Caridea) from Japan". Zoosystema, Vol 20: 229-238.
4. Kim W., 1998. "Chelomalpheus koreanus, a new genus and species of snapping shrimp from Korea (Crustacea: Decapoda: Alpheidae)". Proceedings of the Biological Society of Washington, Vol 111(1): 140-145.
5. Miya Y., 1997. "Stenalpheops anacanthus, new genus, new species (Crustacea, Decapoda, Alpheidae) from the Seto Inland Sea and the Sea of Ariake, south Japan". Bulletin of the Faculty of Liberal Arts, Nagasaki University, (Natural Science) Vol 38(1): 145-161.

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