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Issue: Vol. 5284 No. 2: 11 May 2023
Type: Article
Published: 2023-05-11
DOI: 10.11646/zootaxa.5284.2.8
Page range: 364-376
Abstract views: 405
PDF downloaded: 16

Two new species of semiaquatic freshwater crabs of the genera Tortomon and Aiyunamon from karst forests in northern Vietnam (Crustacea: Brachyura: Potamidae)

Lee Kong Chian Natural History Museum; Faculty of Science; National University of Singapore; 2 Conservatory Drive; Singapore 117377; Republic of Singapore
National Key Laboratory; Institute of Tropical Biology; Vietnamese Academy of Sciences and Technology; 9/621 Hanoi Highway; Thu Duc City; Ho Chi Minh City; Vietnam
Crustacea Potamoidea new genus records rediagnosis descriptions of new species taxonomy distribution karst habitat

Abstract

Two new genera of freshwater crabs (Potamidae) are recorded from northern Vietnam, Tortomon Huang, Wang & Shih, 2020, and Aiyunamon Pan, Ng & Sun, 2022. These genera had previously only been reported from southern China and eastern Myanmar. Each genus is represented by a new species. Tortomon distinctum n. sp. is markedly different from its two Chinese congeners in its proportionately wider carapace, more elongate third maxilliped, the carpus of the cheliped being armed only with a low tubercle, possessing relatively more slender and longer ambulatory legs, a gently curved male first gonopod and a more elongate male second gonopod. Aiyunamon vietnamicum n. sp. is distinct from its five congeners in its proportionately less convex dorsal surface of the carapace, relatively lower epigastric cristae, lower rugosities of the postorbital cristae, wider median lobe of the posterior margin of the epistome, relatively narrower male pleon, and a male first gonopod that has the terminal segment more distinctly curved with a wider concavity on the outer margin of the subterminal segment.

 

References

  1. Alcock, A. (1909) Diagnoses of new species and varieties of freshwater crabs. No. 4. Records of the Indian Museum, 3, 375–381. https://doi.org/10.26515/rzsi/v3/i4/1909/163297
  2. Bott, R. (1970) Die Süsswasserkrabben von Europa, Asien, Australien und ihre Stammesgeschichte. Eine Revision der Potamoidea und de Parathelphusoidea. (Crustacea, Decapoda). Abhandlungen der Senckenbergische Naturforschenden Gesellschaft, 526, 1–338.
  3. Cumberlidge, N., Ng, P.K.L., Yeo, D.C.J., Magalhaes, C., Campos, M.R., Alvarez, F., Naruse, T., Daniels, S.R., Esser, L.J., Attipoe, F.Y.K. Clotilde-Ba, F.-L., Darwall, W., Mcivor, A., Collen, B. & Ram, M. (2009) Freshwater crabs and the biodiversity crisis: importance, threats, status, and conservation challenges. Biological Conservation, 142, 1665–1673. https://doi.org/10.1016/j.biocon.2009.02.038
  4. Dai, A.Y. (1999) Fauna Sinica: Arthropoda Crustacea Malacostraca Decapod Parathelphusidae Potamidae. Science Press, Beijing, 501 pp., 30 pls. [in Chinese with English summary]
  5. Dai, A.-Y. & Chen, G.-X. (1985) A publication on the freshwater crab fauna of Hengduan Shan District. Sinozoologica, 3, 39–72.
  6. Đăng, N.T. & Hồ, T.H. (2012) Tôm, Cua nýớc ngọt Việt Nam (Palaemonidae, Atyidae, Parathelphusidae, Potamidae) (Freshwater Crabs and Shrimps from Vietnam (Palaemonidae, Atyidae, Parathelphusidae, Potamidae)). Publishing House for Science and Technology, Hanoi, 264 pp. [in Vietnamese]
  7. 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. Vol. 9C-I. Decapoda: Brachyura (Part 1). Brill, Leiden, pp. 11–163. https://doi.org/10.1163/9789004190832_004
  8. Huang, C., Wang, J. & Shih, H.-T. (2020) 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), 1–14. https://doi.org/10.6620/ZS.2020.59-24
  9. Ng, P.K.L. (1988) s.n. In: The freshwater crabs of Peninsular Malaysia and Singapore. Department of Zoology, National University of Singapore, Shinglee Press, Singapore, pp. i–viii + 1–156, figs. 1–63, 4 colour pls.
  10. Ng, P.K.L. (2021) Description of a new genus and new species of freshwater crab (Brachyura: Potamoidea) from southern Vietnam. Crustacean Research, 50, 65–73. https://doi.org/10.18353/crustacea.50.0_65
  11. Ng, P.K.L. & Clark, P.F. (2022) A new species of Eosamon (Crustacea, Brachyura, Potamidae) described from Bokor, Cambodia. Crustacean Research, 51, 115–121. https://doi.org/10.18353/crustacea.51.0_115
  12. Ng, P.K.L., Htoo, H. & Mar, W. (2019) Potamiscus whitteni, a new freshwater crab from Chin State, Myanmar (Crustacea: Brachyura: Potamidae). Raffles Bulletin of Zoology, Supplement 35, 129–136.
  13. Ng, P.K.L., Mar, W. & Shih, H.-T. (2020) Indawmon thanayei, a new genus and new species of freshwater crab (Crustacea: Brachyura: Potamidae) from Indawgyi Lake, Kachin State, Myanmar. Raffles Bulletin of Zoology, 68, 529–538.
  14. Pan, D., Ng, P.K.L. & Sun, H. (2022) Aiyunamon, a new genus for southern Chinese potamid species previously placed in Eosamon Yeo & Ng, 2007 (Decapoda, Brachyura, Potamidae). Raffles Bulletin of Zoology, 70, 320–328.
  15. Pan, D., Sun, H. & Ng, P.K.L. (2023) The identity of the freshwater crab Aiyunamon tumidum (Wood-Mason, 1871) (Brachyura, Potamidae), with description of a new species from China. Crustaceana, 96 (2), 179–198. https://doi.org/10.1163/15685403-bja10276
  16. Pati, S.K., Mitra, S. & Ng, P.K.L. (2020) The identity of the freshwater crab Indochinamon manipurense (Alcock, 1909), with description of a new species of Potamiscus Alcock, 1909, from Manipur State, India (Decapoda, Brachyura, Potamidae). Crustaceana, 93 (7), 703–725. https://doi.org/10.1163/15685403-bja10009
  17. Ortmann, A. (1896) Das system der Decapoden-Krebse. Zoologische Jahrbücher, Abtheilung für Systematik, Geographie und Biologie der Thiere, 9, 409–453.
  18. Wood-Mason, J. (1871) Contribution to Indian carcinology. Journal of the Asiatic Society of Bengal, 40, 189–207 + 449–454, pls. 11–14 + 27.
  19. Yeo, D.C.J. (2010) A new species of Eosamon from southern Vietnam (Brachyura, Potamidae), with notes on E. brousmichei (Rathbun, 1904). In: Fransen, C.H.J.M., De Grave, S. & Ng, P.K.L. (Eds.), Studies on Malacostraca: Lipke Bijdeley Holthuis Memorial Volume. Brill, Leiden, pp. 747–754. https://doi.org/10.1163/9789047427759_056
  20. Yeo, D.C.J. & Ng, P.K.L. (2004) Recognition of two subfamilies in the Potamidae Ortmann, 1896 (Brachyura, Potamidae) with a note on the genus Potamon Savigny, 1816. Crustaceana, 76 (10), 1219–1235. https://doi.org/10.1163/156854003773123456
  21. Yeo, D.C.J. & Ng, P.K.L. (2007) On the genus “Potamon” and allies in Indochina (Crustacea: Decapoda: Brachyura: Potamidae). Raffles Bulletin of Zoology, Supplement 16, 273–308.
  22. Zhang, Z., Pan, D., Hao, X. & Sun, H. (2020) Two new species of freshwater crabs of the genera Eosamon Yeo & Ng, 2007 and Indochinamon Yeo & Ng, 2007 (Crustacea, Brachyura, Potamidae) from southern Yunnan, China. Zookeys, 980, 1–21. https://doi.org/10.3897/zookeys.980.52186