Paralona sirindhornae sp. nov. and Karualona cambodiaensis sp. nov., Two New Species of Cladocera (Crustacea: Cladocera: Chydoridae) from Southeast Asia
DOI:
https://doi.org/10.58837/tnh.25.8.267184Keywords:
biodiversity, Lake Bueng Khong Long, Cambodia, rare species, taxonomy, ThailandAbstract
Two new cladocera species of the family Chydoridae (Crustacea: Cladocera) are described from Southeast Asia. Populations of Paralona sirindhornae sp. nov. were found in Thailand and Cambodia, while Karualona cambodiaensis sp. nov. was detected in Cambodia only. Paralona sirindhornae sp. nov. differs from the only other species of the genus Paralona Šramek-Hušek, Strašcraba et Brtek, 1962, namely, Holarctic P. pigra (Sars, 1862), in its smaller size, different position of the head pores, and the morphology of thoracic limbs III–V. Our data suggest that the populations of Paralona from South America and Africa also belong to independent species rather than P. pigra. Karualona cambodiaensis sp. nov. differs from other species of the genus in the unique morphology of the posteroventral angle of the valves, as well as in the body shape and morphology of the antenna. The morphology and taxonomic position of two new species are discussed. Both new species appear to be extremely rare in Southeast Asia, and their discovery is a result of recent intensive sampling efforts.
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