Korovchinsky N.M.1, Sanoamuang La-orsi2. 2013. Comparative investigation of Sididae (Crustacea: Branchiopoda: Cladocera) of Northern and Western Thailand, with additional notes on Diaphanosoma senegal isanensis  Korovchinsky et Sanoamuang, 2008 // Arthropoda Selecta. Vol.22. No.3: 217–226 [in English].

1 A.N. Severtsov Institute of Ecology and Evolution, Leninsky prospect 33, Moscow 119071, Russian Federation. E-mail: nmkor@yandex.ru

2 Applied Taxonomic Research Center, Faculty of Sciences, Khon Kaen University, Khon Kaen 40002 and Faculty of Sciences, Mahasarakham University, 44150 Maha Sarakham, Thailand. E-mail: la_orsri@kku.ac.th

KEY WORDS: Cladocera, Sididae, Northern and Western Thailand, Diaphanosoma senegal isanensis.

ABSTRACT. The first extensive investigation of Cladocera from Northern and Western Thailand has revealed eight species of the family Sididae (Diaphanosoma excisum Sars, 1885,  D. dubium Manuilova, 1964, D. sarsi Richard, 1894, D. volzi Stingelin, 1905, D. senegal isanensis Korovchinsky et Sanoamuang, 2008, D. elongatum Korovchinsky et Sanoamuang, 2008, Latonopsis australis Sars, 1888, Pseudosida szalayi (Daday, 1898)) among which two former species, Diaphanosoma excisum and D. dubium, were most widely distributed and abundant; while, D. senegal isanensis and D. elongatum were rare or extremely rare, found only in four and one locality, respectively. Sididae species were often observed co-occurring in different combinations, among them up to three species of Diaphanosoma have been recorded as sympathric. A few species of the Sididae of northern origin found earlier in Northeastern Thailand were not encountered in the regions under consideration, probably due to their comparatively higher elevation and isolation from the influence of large rivers flowing from the north and promoting the migration of aquatic species to the south. Additional investigation of D. senegal isanensis, including its representatives from Laos and Cambodia, has allowed to analyze  size-frequency distribution and age-dependent morphological variability, to describe males of the subspecies for the first time and to summarize data of subspecies distribution throughout Southeast Asia.

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