Abstract
The investigation of an extensive collection of zooplankton samples from Northeast and East Thailand has revealed 10 species of the family Sididae, members of which often were mostly frequently distributed and abundant among Cladocera. Of seven species of the genus Diaphanosoma, one is new to science (D. elongatum sp. nov.) and two others, D. senegal and D. macrophthalma, new to Thailand. The genus Pseudosida is represented by P. szalayi instead of P. bidentata incorrectly recorded previously. Eleven species of Sididae are now known from Northeast Thailand and 12 from the whole country. The highest frequency occurrence and abundance were observed in D. excisum, D. dubium, Latonopsis australis, and P. szalayi while other species were more infrequent (D. sarsi) or rare. Sididae species were often observed co-occurring in different combinations, among them up to three-four species of Diaphanosoma. The rare species D. senegal frequently co-occurred with large Branchiopoda. Most Sididae of Northeast Thailand are of tropical origin while others (D. dubium, D. macrophthalma, Sida crystallina) have penetrated here from more northern latitudes.References
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