Vol. 59, 2020
What is Sesarmops impressus (H. Milne
Edwards, 1837) (Crustacea: Brachyura: Sesarmidae)?
K. L. Ng1, Jheng-Jhang,Li2,3, and Hsi-Te Shih4,*
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,
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:
(Received 28 March 2020 / Accepted 13
Communicated by Benny K.K. Chan
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.
Taxonomy, New species, Sesarmops impressus, S. indicus, S. imperator,
S. atrorubens, S. similis, Morphology, Mitochondrial 16S rDNA,
Cytochrome oxidase subunit I.
Ng PKL, Li JJ, Shih HT. 2020. What is Sesarmops impressus (H. Milne
Edwards, 1837) (Crustacea: Brachyura: Sesarmidae)? Zool Stud 59:0x. doi:-.