Vol. 61, 2022
The Identity of Homoioplax haswelli (Miers, 1884) (Crustacea: Decapoda: Brachyura)
Peter K. L. Ng1, Paul F. Clark2,*, and Shane T. Ahyong3
Kong Chian Natural History Museum, Faculty of Science, National
University of Singapore, 2 Conservatory Drive, Singapore 117377,
Republic of Singapore. E-mail: firstname.lastname@example.org (Ng)
2Department of Life Sciences, The Natural History
Museum, Cromwell Road, London SW7 5BD, England. *Correspondence:
E-mail: email@example.com (Clark)
3Australian Museum Research Institute, Australian
Museum, 1 William Street, Sydney, NSW 2010, Australia, and School of
Biological, Earth and Environmental Sciences, University of New South
Wales, Kensington, NSW 2052, Australia. E-mail:
Received 18 October 2021 / Accepted 24 December 2021
Communicated by Benny K.K. Chan
The brachyuran crab, Pseudorhombila haswelli
Miers, 1884, described on the basis of two juveniles from the Arafura
Sea, is a poorly known species of uncertain systematic position. It was
made the type and only species of Homoioplax
Rathbun, 1914, and assigned to the Prionoplacinae (Goneplacidae).
Subsequent revisions of the goneplacids showed Prionoplacinae to be a
junior synonym of Eucratopsinae Stimpson, 1871, as a member of the
Panopeidae Ortmann, 1893, but none re-evaluated the position of Homoioplax. As a result, Homoioplax
has remained in the Panopeidae as the only Indo-West Pacific
representative of the family. This study assesses the systematic status
of Homoioplax haswelli based on re-study of the type and other material of the species. Homoioplax haswelli is here attributed to Carcinoplax H. Milne Edwards, 1852 (Goneplacidae), justifying the recognition of the species described by Miers as C. haswelli. Moreover, Carcinoplax haswelli is shown to be a senior synonym of C. sinica Chen, 1984, described from the South China Sea. Therefore, C. haswelli
is now known to range from southern Taiwan and the Philippines, through
the South China Sea, northern Vietnam, the eastern waters of Singapore
to the Madura Straits in eastern Java and Arafura Sea, northern
Australia, at 25–187 m, usually less than 100 m depth.
Key words: Pseudorhombila haswelli, Carcinoplax, new combination, senior synonym, C. sinica, New distribution, Goneplacidae.
Citation: Ng PKL, Clark PF, Ahyong ST. 2022. The identity of Homoioplax haswelli (Miers, 1884) (Crustacea: Decapoda: Brachyura). Zool Stud 61:0f.