Zoological Studies

Vol. 59, 2020

(update: 2020.05.22)

What is Sesarmops impressus (H. Milne Edwards, 1837) (Crustacea: Brachyura: Sesarmidae)?

Peter K. L. Ng1, Jheng-Jhang,Li2,3, and Hsi-Te Shih4,*


1Lee Kong Chian Natural History Museum, National University of Singapore, 2 Conservatory Drive, Singapore 117377, Republic of Singapore
2Department of Marine Biotechnology and Resources, National Sun Yat-sen University, 70, Lianhai Road, Kaohsiung 80424, Taiwan
3East Peak Ecological Consultants, Inc., 22, Wanggong Road, Linyuan Dist., Kaohsiung 83249, Taiwan
4Department of Life Science and Research Center for Global Change Biology, National Chung Hsing University, 250, Kuo Kuang Road, Taichung 402, Taiwan. *Correspondence: Email: htshih@dragon.nchu.edu.tw

(Received 28 March 2020 / Accepted 13 May 2020)
Communicated by Benny K.K. Chan

The identity of the widely distributed mangrove and riverine sesarmid crab Sesarmops impressus (H. Milne Edwards, 1837) is clarified. The species has been reported from Madagascar to the South Pacific but its taxonomy has been uncertain. On the basis of morphological characters and available molecular evidence (using 16S rDNA and cytochrome oxidase subunit I), Sesarmops impressus is restricted to the western Indian Ocean and S. frontale (A. Milne-Edwards, 1969) is confirmed to be its junior synonym. Sesarmops similis (Hess, 1865), long synonymised under S. impressus, is here recognised as a separate species and a neotype from Samoa is designated. The identity of the poorly known S. atrorubens (Hess, 1865), which has often been confused with S. impressus, is also clarified, and a neotype is selected from Fiji. Specimens from the eastern Indian Ocean and western Pacific are here referred to two new species, S. indicus and S. imperator.

Key words: Taxonomy, New species, Sesarmops impressus, S. indicus, S. imperator, S. atrorubens, S. similis, Morphology, Mitochondrial 16S rDNA, Cytochrome oxidase subunit I.

Citation: Ng PKL, Li JJ, Shih HT. 2020. What is Sesarmops impressus (H. Milne Edwards, 1837) (Crustacea: Brachyura: Sesarmidae)? Zool Stud 59:0x. doi:-.