Abstract
The history, taxonomy and nomenclatural issues revolving around the genus Flabellamon Ng, 1996, are reviewed. The genus of late contained two species, F. kuehnelti (Pretzmann, 1963) and F. wanchaii Takeda, Sanpool & Intapan, 2019. In the process of this review, two new species of this genus were uncovered from historical materials that were previously misidentified, and described herein as, F. ngankee sp. nov. (from northwestern Thailand) and F. mulayit sp. nov. (from southeastern Myanmar). Flabellamon ngankee sp. nov. is most similar superficially to F. wanchaii but can be distinguished easily by morphological differences in carapace armature, external orbital tooth, male pleonal margins and male gonopod. Flabellamon mulayit sp. nov. on the other hand, is more similar morphologically to F. kuehnelti, but can also be distinguished easily by epibranchial tooth and male gonopod characters. An identification key to the species of Flabellamon is provided.
References
- Alcock, A. (1910) Brachyura I. Fasc. II. The Indian Freshwater Crabs – Potamonidae. In: Catalogue of the Indian Decapod Crustacea in the collection of the Indian Museum. Printed by order of the trustees of the Indian museum, Calcutta, pp. 1–135, pls. 1–14.
- Bott, R. (1970) Die Süsswasserkrabben von Europa, Asien, Australien und ihre Stammesgeschichte. Eine Revision der Potamoidea und Parathelphusoidea (Crustacea, Decapoda). Abhandlungen der Senckenbergischen Naturforschenden Gesellschaft, Frankfurt, 526, 1–338, pls. 1–58.
- Brandis, D. (2001) On the taxonomy and biogeography of Potamon atkinsonianum (Wood-Mason, 1871) and Potamon (Potamon) emphysetum (Alcock, 1909). Hydrobiologia, 452, 89–100. https://doi.org/10.1023/A:1011975910981
- Brandis, D. (2002) On the taxonomic status and biogeography of the Isolapotamidae Bott, 1970 (Decapoda, Brachyura). Journal of Natural History, 36, 1291–1339. https://doi.org/10.1080/00222930110051743
- 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
- De Man, J.G. (1898) Viaggo di Leonardo Fea in Birmania. Annali del Museo Civico di Storia Naturale di Genova, Series 2, 19, 284–440.
- Guinot, D., Tavares, M. & Castro, P. (2013) Significance of the sexual openings and supplementary structures on the phylogeny of brachyuran crabs (Crustacea, Decapoda, Brachyura), with new nomina for higher-ranked podotreme taxa. Zootaxa, 3665 (1), 1–414. https://doi.org/10.11646/zootaxa.3665.1.1
- Naiyanetr, P. (2001) Potamon galyaniae n. sp., a new freshwater crab from Thailand (Decapoda, Brachyura, Potamidae). Crustaceana, 74, 401–405 https://doi.org/10.1163/156854001300104480
- Ng, P.K.L. (1988) The Freshwater Crabs of Peninsular Malaysia and Singapore. Department of Zoology, National University of Singapore, Shinglee Press, Singapore, 156 pp., 63 figs., 4 colour pls.
- Ng, P.K.L. (1996) On a new genus and new species of potamid crab (Brachyura) from Burma. Crustaceana, 69 (8), 1005–1013. https://doi.org/10.1163/156854096X00439
- 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
- Ng, P.K.L. & Naiyanetr, P. (1993) New and recently described freshwater crabs (Crustacea: Decapoda: Brachyura: Potamidae, Gecarcinucidae and Parathelphusidae) from Thailand. Zoologische Verhandelingen, 284, 1–117, figs. 1–68.
- Ng, P.K.L. & Vidthayanon, C. (2013) Thampramon tonvuthi, a new genus and new species of cavernicolous crab (Crustacea: Decapoda: Brachyura: Potamidae) from Thailand. Zootaxa, 3652 (2), 265–276. https://doi.org/10.11646/zootaxa.3652.2.4
- Ng, P.K.L., Guinot, D. & Davie, P.J.F. (2008) Systema Brachyurorum: Part I. An annotated checklist of extant brachyuran crabs of the world. Raffles Bulletin of Zoology, 17 (1), 1–286.
- Pretzmann, G. (1963) Uber einige Süd- und Ostasiatische Potamoniden. Annalen des Naturhistorischen Museums in Wien, 66, 361–372, pls. 1–4.
- Rathbun, M.J. (1904) Les crabes d'eau douce. Nouvelles Archives du Muséum d’Histoire Naturelle, Paris, Series 4, 6, 225–312, pls. 9–18.
- Takeda, M., Sanpool, O. & Intapan, P.M. (2019) A New Freshwater Crab of the Genus Flabellamon Ng, 1996 (Crustacea, Decapoda, Brachyura, Potamidae) from Northwestern Thailand. Bulletin of the National Museum of Nature and Science, Tokyo, Series A (Animal), 45, 87–93.
- Wood-Mason, J. (1871) Contribution to Indian carcinology. Journal of the Asiatic Society of Bengal, 40 (2), 189–207 + 449–454, pls. 11–14, 27.
- Yeo, D.C.J. & Naiyanetr, P. (2000) A new genus of freshwater crab (Crustacea: Decapoda: Brachyura: Potamidae) from Thailand, with a description of a new species. Journal of Natural History, 34, 1625–1638. https://doi.org/10.1080/00222930050117521
- Yeo, D.C.J. & Ng, P.K.L. (1999) The state of freshwater crab taxonomy in Indochina (Decapoda, Brachyura). In: Schram, F.R. & von Vaupel Klein, J.C. (Eds.), Crustaceans and the Biodiversity Crisis, Proceedings of the Fourth International Crustacean Congress, Amsterdam, The Netherlands, 20–24 July 1998, 1, pp. 637–646. https://doi.org/10.1163/9789004630543_050
- 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. Crustaceana, 76 (10), 1219–1235. https://doi.org/10.1163/156854003773123456
- 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, 16, 273–308.