Skip to main content Skip to main navigation menu Skip to site footer
Type: Article
Published: 2021-10-28
Page range: 93-104
Abstract views: 665
PDF downloaded: 577

Geothelphusa boreas, a new montane freshwater crab (Crustacea: Potamidae: Geothelphusa) from northeastern Taiwan, and the identity of G. hirsuta Tan & Liu, 1998

Department of Aquaculture, National Penghu University, 300 Liuhe Road, Magong City, Penghu 880, Taiwan.
Department of Life Science and Research Center for Global Change Biology, National Chung Hsing University, 250 Kuo Kuang Road, Taichung 402, Taiwan.
Department of Forestry and Natural Resources, National Ilan University, 1, Sec. 1, Shen-Lung Road, Yilan 260, Taiwan.
Crustacea Potamidae freshwater crab new species Geothelphusa boreas G. hirsuta G. takuan Taiwan mitochondrial DNA cytochrome oxidase subunit I


A new freshwater crab is described from the montane area in northeastern Taiwan based on morphological and molecular evidence. Geothelphusa boreas sp. nov., from the Fushan Botanical Garden situated around New Taipei City and Yilan County, is distinct from similar congeners by the structure of the male first gonopod and the proportions of the male thoracic sternites. In addition, after comparing the holotypes of G. takuan and G. hirsuta Tan & Liu, 1998, no substantial difference could be found. Molecular evidence from mitochondrial cytochrome oxidase subunit I also supports the recognition of the new species and the conspecificity of G. hirsuta with G. takuan.



  1. Chen, W.-J., Cheng, J.-H., Chen, T.-I. & Hsu, M.J. (2007a) A comparison of the micromorphology of the G1 of freshwater crabs of the genus Geothelphusa (Brachyura, Potamidae) from Taiwan. Crustaceana, 80, 861–889.
    Chen, W.-J., Hsu, M.J. & Cheng, J.-H. (2007b) A new species of alpine freshwater crab (Brachyura: Potamidae) from Siangyang National Forest Recreation area, Taiwan. Crustaceana, 80, 897–907.
    Chu, K.H., Schubart, C.D., Shih, H.-T. & Tsang, L.M. (2015) Genetic diversity and evolution of Brachyura. In: Castro, P., Davie, P.J.F., Guinot, D., Schram, F.R. & von Vaupel Klein, J.C. (Eds.), Treatise on Zoology—Anatomy, Taxonomy, Biology—The Crustacea, Complementary to the Volumes Translated from the French of the Traité de Zoologie. 9 (C) (II). Decapoda: Brachyura. Part 2. Brill, Leiden, pp. 775–820.
    Chu, K.-L., Ma, X.-P., Zhang, Z.-W., Wang, P.-F., Lu, L.-N., Zhao, Q. & Sun, H.-Y. (2018a) A checklist for the classification and distribution of China’s freshwater crabs. Biodiversity Science, 26, 274–282. [in Chinese]
    Chu, K.-L., Wang, P.-F. & Sun, H.-Y. (2018b) A new genus and species of primary freshwater crab and a new species of Artopotamon Dai & Chen, 1985 (Crustacea, Brachyura, Potamidae) from western Yunnan, China. Zootaxa, 4422 (1), 115–131.
    Chu, K.-L., Zhou, L.-J. & Sun, H.-Y. (2017) A new genus and new species of freshwater crab (Decapoda: Brachyura: Potamidae Ortmann, 1896) from Yunnan Province, China. Zootaxa, 4286 (2), 241–253.
    Dai, A.-Y. (1999) Fauna Sinica. Arthropoda: Crustacea: Malacostraca: Decapoda: Parathelphusidae, Potamidae. Science Press, Beijing, 501 pp., 30 pls. [in Chinese]
    Darriba, D., Taboada, G. L., Doallo, R. & Posada, D. (2012) jModelTest 2: more models, new heuristics and parallel computing. Nature Methods, 9, 772.
    Davie, P.J.F., Guinot, D. & Ng, P.K.L. (2015) Anatomy and functional morphology of Brachyura. In: Castro, P., Davie, P.J.F., Guinot, D., Schram, F.R. & von Vaupel Klein, J.C. (Eds.), Treatise on Zoology—Anatomy, Taxonomy, Biology—The Crustacea, complementary to the volumes translated from the French of the Traité de Zoologie. 9(C)(I). Decapoda: Brachyura. Part 1. Brill, Leiden, pp. 11–163.
    Do, V. T., Shih, H.-T. & Huang, C. (2016) A new species of freshwater crab of the genus Tiwaripotamon Bott, 1970 (Crustacea, Brachyura, Potamidae) from northern Vietnam and southern China. Raffles Bulletin of Zoology, 64, 213–219.
    Folmer, O., Black, M., Hoeh, W., Lutz, R. & Vrijenhoek, R. (1994) DNA primers for amplification of mitochondrial cytochrome c oxidase subunit I from diverse metazoan invertebrates. Molecular Marine Biology and Biotechnology, 3, 294–299.
    Huang, C. (2018) Revision of Yarepotamon Dai & Türkay, 1997 (Brachyura: Potamidae), freshwater crabs endemic to southern China, with descriptions of two new genera and four new species. Journal of Crustacean Biology, 38, 173–189.
    Huang, C., Ahyong, S.T. & Shih, H.-T. (2017a) Cantopotamon: a new genus of freshwater crabs from Guangdong, China, with descriptions of four new species (Crustacea: Decapoda: Brachyura: Potamidae). Zoological Studies, 56, 41.
    Huang, C., Ahyong, S.T. & Shih, H.-T. (2020a) The second known stygomorphic freshwater crab from China, Phasmon typhlops gen. nov. et sp. nov. (Crustacea, Decapoda, Potamidae), diverged at the beginning of the Late Miocene. ZooKeys, 1008, 1–15.
    Huang, C., Huang, S.-Z. & Shen, Z.-X. (2020b) A new long-legged terrestrial freshwater crab, Calcipotamon puglabrum gen. nov. et sp. nov. (Crustacea: Decapoda: Potamidae), from Hainan Island, China. Zootaxa, 4766 (3), 447–456.
    Huang, C., Mao, S.-Y. & Huang, J.R. (2014) Two new potamid crabs, Yuexipotamon arcophallus new genus, new species and Minutomon shanweiense new genus, new species, (Crustacea: Decapoda: Brachyura: Potamidae) from southern China. Zootaxa, 3764 (4), 455–466.
    Huang, C., Shih, H.-T. & Ahyong, S.T. (2018) Two new genera and two new species of narrow-range freshwater crabs from Guangdong, China (Decapoda: Brachyura: Potamidae). Journal of Crustacean Biology, 38, 614–624.
    Huang, C., Shih, H.-T. & Mao, S.-Y. (2016) Yuebeipotamon calciatile, a new genus and new species of freshwater crab from southern China (Crustacea, Decapoda, Brachyura, Potamidae). ZooKeys, 615, 61–72.
    Huang, C., Shih, H.-T. & Ng, P.K.L. (2017b) A new genus and new species of Potamidae (Crustacea: Decapoda: Brachyura: Potamoidea), the first stygomorphic cave crab known from China and East Asia. Zootaxa, 4232 (1), 71–84 + 4250 + 600.
    Huang, C., Wang, J. & Shih, H.-T. (2020c) A new genus and two new species of freshwater crab (Crustacea: Brachyura: Potamidae) with unusual coiled tip of male second gonopods from Yunnan, southwestern China. Zoological Studies, 59, 24.
    Kimura, M. (1980) A simple method for estimating evolutionary rates of base substitutions through comparative studies of nucleotide sequences. Journal of Molecular Evolution, 16, 111–120.
    Kumar, S., Stecher, G., Li, M., Knyaz, C. & Tamura, K. (2018) MEGA X: Molecular Evolutionary Genetics Analysis across computing platforms. Molecular Biology and Evolution, 35, 1547–1549.
    Lanfear, R., Frandsen, P.B., Wright, A.M., Senfeld, T. & Calcott, B. (2017) PartitionFinder 2: new methods for selecting partitioned models of evolution for molecular and morphological phylogenetic analyses. Molecular Biology and Evolution, 34, 772–773.
    Mao, S.-Y. & Huang, C. (2020) Descriptions of a new species of Minpotamon Dai & Türkay, 1997, and a monotypic new genus of aquatic freshwater crab (Brachyura, Potamidae) from eastern Guangdong, China. Crustaceana, 93, 1295–1313.
    Ng, P.K.L. (1988) The Freshwater Crabs of Peninsular Malaysia and Singapore. Shing Lee, Singapore, 156 pp.
    Ng, P.K.L., Guinot, D. & Davie, P.J.F. (2008) Systema Brachyurorum: Part 1. An annotated checklist of extant brachyuran crabs of the world. Raffles Bulletin of Zoology, Supplement 17, 1–296.
    Ng, P.K.L., Shih, H.-T., Ho, P.-H. & Wang, C.-H. (2017) An updated annotated checklist of brachyuran crabs from Taiwan (Crustacea: Decapoda). Journal of the National Taiwan Museum, 70 (3/4), 1–208.;4).01
    Ng, P.K.L., Shih, H.-T., Naruse, T. & Shy, J.-Y. (2010) Using molecular tools to establish the type locality and distribution of the endemic Taiwanese freshwater crab Geothelphusa chiui Minei, 1974, (Crustacea: Brachyura: Potamidae), with notes on the genetic diversity of Geothelphusa from eastern Taiwan. Zoological Studies, 49, 544–555.
    Ng, P.K.L., Wang, C.-H., Ho, P.-H. & Shih, H.-T. (2001) An annotated checklist of brachyuran crabs from Taiwan (Crustacea: Decapoda). National Taiwan Museum Special Publication Series, 11, 1–86.
    Ortmann, A.E. (1896) Das System der Decapoden-Krebse. Zoologische Jahrbücher, Abtheilung für Systematik, Geographie und Biologie der Thiere, 9 (3), 409–453.
    Roman, J. & Palumbi, S.R. (2004) A global invader at home: population structure of the green crab, Carcinus maenas, in Europe. Molecular Ecology, 13, 2891–2898.
    Ronquist, F., Huelsenbeck, J.P., Teslenko, M. & Nylander, A.A. (2020) MrBayes 3.2 Manual: Tutorials and Model Summaries. Available from: (accessed 16 January 2021)
    Ronquist, F., Teslenko, M., van der Mark, P., Ayres, D.L., Darling, A., Höhna, S., Larget, B., Liu, L., Suchard, M.A. & Huelsenbeck, J.P. (2012) MRBAYES 3.2: efficient Bayesian phylogenetic inference and model choice across a large model space. Systematic Biology, 61, 539–542.
    Schubart, C.D. (2009) Mitochondrial DNA and decapod phylogenies: the importance of pseudogenes and primer optimization. In: Martin, J.W., Crandall, K.A. & Felder, D.L. (Eds.), Decapod Crustacean Phylogenetics. Crustacean Issues. Vol. 18. CRC Press, Taylor & Francis Group, Boca Raton, London, New York, pp. 47–65.
    Shih, H.-T. & Ng, P.K.L. (2011) Diversity and biogeography of freshwater crabs (Crustacea: Brachyura: Potamidae, Gecarcinucidae) from East Asia. Systematics and Biodiversity, 9, 1–16.
    Shih, H.-T., Ng, P.K.L., Naruse, T., Shokita, S. & Liu, M.-Y. (2011) Pleistocene speciation of freshwater crabs (Crustacea: Potamidae: Geothelphusa) from northern Taiwan and southern Ryukyus, as revealed by phylogenetic relationships. Zoologischer Anzeiger, 250, 457–471.
    Shih, H.-T., Shy, J.-Y., Lee, J.-H. (2010) A new freshwater crab of the genus Geothelphusa (Brachyura, Potamidae) from southwestern Taiwan. Crustaceana Monographs, 14, 661–675.
    Shy, J.-Y. & Lee, P.-W. (2009) Guide to the Taiwanese Freshwater Crabs. Morning Star Publishing, Taipei, 221 pp. [in Chinese]
    Shy, J.-Y., Ng, P.K.L. & Yu, H.-P. (1994) Crabs of the genus Geothelphusa Stimpson, 1858 (Crustacea: Decapoda: Brachyura: Potamidae) from Taiwan, with descriptions of 25 new species. Raffles Bulletin of Zoology, 42, 781–846.
    Shy, J.-Y., Shih, H.-T. & Mao, J.-J. (2014) Description of a new montane freshwater crab (Crustacea: Potamidae: Geothelphusa) from northern Taiwan. Zootaxa, 3869 (5), 565–572.
    Shy, J.-Y., Shih, H.-T. & Ng, P.K.L. (2020) Crustacean Fauna of Taiwan: Brachyuran Crabs. Vol. III. Freshwater Crabs—Potamidae, Gecarcinucidae. National Penghu University of Science and Technology, Penghu, 26 + 232 pp.
    Shy, J.-Y. & Yu, H.-P. (1999) Freshwater Crabs of Taiwan. National Museum of Marine Biology/Aquarium, Pingtung, ii + 114 pp. [in Chinese]
    Stimpson W (1858) Prodromus descriptionis animalium evertebratorum, quae in Expeditione ad Oceanum Pacificum Septentrionalem, a Republica Federata missa, Cadwaladaro Ringgold et Johanne Rodgers Ducibus, observavit et descripsit.Pars V. Crustacea Ocypodoidea. Proceedings of the Academy of Natural Sciences of Philadelphia, 10, 93–110.
    Suzuki, H. & Kawai, T. (2011) Two new freshwater crabs of the genus Geothelphusa Stimpson, 1858 (Crustacea: Decapoda: Brachyura: Potamidae) from islands of southern Kyushu, Japan. Crustacean Research, 40, 21–31.
    Tan, S.H. & Liu, H.-C. (1998) Two new species of Geothelphusa (Decapoda: Brachyura: Potamidae) from Taiwan. Zoological Studies, 37, 286–290.
    Wang, P.-F., Zhang, Z.-W. & Sun, H.-Y. (2020) Ruiyupotamon, a new genus and four new species of freshwater crabs from northwestern Yunnan, China (Decapoda, Brachyura, Potamidae). Crustaceana, 93, 1315–1342.
    Wang, S.-B., Huang, C. & Zou, J.-X. (2019) Description of a new species of freshwater crab of the genus Qianguimon Huang, 2018 (Crustacea: Decapoda: Brachyura: Potamidae) from Yulin, Guangxi, southern China. Zoological Studies, 58, 31.
    Yeo, D.C.J. & Ng, P.K.L. (2003) Recognition of two subfamilies in the Potamidae Ortmann, 1896 (Brachyura, Potamidae) with a note on the genus Potamon Savigny, 1816. Crustaceana, 76, 1219–1235.