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Freshwater surveys in the tropics have high potential for revealing new taxa if a wide range of habitats is included. Tropical inland swamps are ignored during most zooplankton sampling campaigns. We show that swamps harbour underestimated Cladocera diversities in South East (SE) Asia, illustrated here for Southern (S) Thailand. According to our preliminary data, based on 22 swamp sites in ten provinces, the cladoceran diversity of swamp habitats is high (about 73 taxa), i.e. a species richness of about 85% of the cladoceran taxa recorded in S Thailand. The Chydoridae are the most diverse group, about 66% of the total (48 out of 73 species), followed by the Macrothricidae (12%; 9 species) and the Sididae (11%; 8 species). Daphniidae only occupy a small proportion of the total species in these sites (5%; 4 species). Besides rare taxa, the SE Asian tropical swamps contain new records, even new species. We discuss the importance of tropical swamp habitats as hotspots of cladoceran diversity, which are being destroyed through agricultural and urban development in SE Asia. As an example, we describe two new paludal species of the Chydoridae (Crustacea: Branchiopoda: Cladocera), restricted to inland swamps in S Thailand. The new taxa have conspicuous morphologies within their respective genera ( Karualona Dumont and Silva-Briano, 2000 and Notoalona Rajapaksa and Fernando, 1987), compared to their common sister species in the region. Karualona serrulata n.sp. is separated from congeners by i) divided denticles on the posteroventral corner of the valves and ii) single setules on the anterior face of the first limb (instead of groups of setules, as in the majority of the Aloninae). We include notes on the other, common Karualona sp. populations from S Thailand. These animals show similarities with K. iberica and K. karua, yet belong to neither; we discuss the variability of characters in these populations and in the genus. The second new taxon, Notoalona pseudomacronyx n.sp., is a small species with a postabdomen strongly resembling that of Alona macronyx Daday, 1898, recently allocated to Celsinotum. It seems closest in morphology to an African, yet undescribed species of Notoalona. We included pictorial keys to all the species of these two chydorid genera, which have their main distribution in the circumtropics. Supiyanit Maiphae, Prince of Songkla University Plankton Research Unit, The Center of Excellence for the Biodiversity in Peninsular Thailand Phannee Sa-Ardrit, Prince of Songkla University Princess Maha Chakri Sirindhorn Natural History Museum Supporting Agencies Thailand Research Fund (MRG5280030), the Higher Education Research Promotion, the National Research University Project of Thailand, Office of the Higher Education Commision of Thailand and the Plant Genetic Conservation Project Van Damme, Kay, Supiyanit Maiphae, and Phannee Sa-Ardrit. 2013. “Inland Swamps in South East Asia Harbour Hidden Cladoceran Diversities: Species Richness and the Description of New Paludal Chydoridae (Crustacea: Branchiopoda: Cladocera) from Southern Thailand”. Journal of Limnology 72 (s2):e10. https://doi.org/10.4081/jlimnol.2013.s2.e10. More Citation Formats ACM ACS APA ABNT Chicago Harvard MLA Turabian Vancouver Download Citation Endnote/Zotero/Mendeley (RIS) BibTeX Downloads Download data is not yet available. Citations List of Cited By : Fundamentals of Tropical Freshwater Wetlands Luc Brendonck, Lizaan de Necker, Trevor Dube, Tatenda Dalu, Kay Van Damme, Tom Pinceel, Tamuka Nhiwatiwa South-East Asian populations of Karualona cf. karua (King. 1853) (Crustacea: Cladocera: Chydoridae) belong to a separate species ARTEM Y. SINEV, IRINA I. SEMENYUK Zootaxa : 2023 Multiple Recent Colonizations of the Australian Region by the Chydorus sphaericus Group (Crustacea: Cladocera) Dmitry P. Karabanov, Eugeniya I. Bekker, Petr G. Garibian, Russell J. Shiel, Tsuyoshi Kobayashi, Derek J. Taylor, Alexey A. Kotov Water : 2022 Males and ephippial females of Oriental Chydoridae (Cladocera: Anomopoda) from Cat Tien National Park, South Vietnam ARTEM Y. SINEV, IRINA I. SEMENYUK Zootaxa : 2021 First record of Karualona penuelasi (Cladocera: Anomopoda: Chydoridae) from Colombia Juan M. Fuentes-Reines, Lourdes M.A. Elmoor-Loureiro Revista Mexicana de Biodiversidad : 2015 Toxicity of nickel to tropical freshwater and sediment biota: A critical literature review and gap analysis Monique T. Binet, Merrin S. Adams, Francesca Gissi, Lisa A. Golding, Christian E. Schlekat, Emily R. Garman, Graham Merrington, Jennifer L. Stauber Environmental Toxicology and Chemistry : 2018 An update for cladoceran fauna (Crustacea, Branchiopoda) from Lake Paranoá, Central Brazil, with the first description of a male of Leydigiopsis ornata Daday, 1905 Francisco Diogo R. Sousa, Elisângela Reis Rangel, Mariana Lessa Carneiro da Silva, Ciro Y. Joko, Lourdes M. A. Elmoor-Loureiro Nauplius : 2017 Freshwater Crustacean Zooplankton of Europe Leszek A. Błędzki, Jan Igor Rybak Diversity and distribution of the cladocerans (Crustacea, Branchiopoda) in Thailand Wijittra Choedchim, Supiyanit Maiphae Biodiversity Data Journal : 2023 Themes by Openjournaltheme.com authors FOR AUTHORS SUBMIT YOUR PAPER Guide for Authors Benefits for Authors How to write a scientific paper How to write a Review article Article Processing Charge Registering new species in ZooBank reviewers FOR REVIEWERS Benefits for Reviewers How to review Thanks to Reviewers links LINKS CNR-IRSA - Water Research Institute Associazione Italiana di Oceanologia e Limnologia International Society of Limnology EFFS - European Federation for Freshwater Sciences International Society for Microbial Ecology flyer JOURNAL FLYER Phytoplankton-zooplankton coupling in a cascade of hypertrophic fishponds 21 September 2023 Marija Radojičić et al. 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