Abstract
The representatives of the rare genus Sarsilatona close to originally poorly described S. fernandoi (Rane, 1983) from Central India (Madhya Pradesh State) are studied on the basis of female specimens from two localities in the south of Vietnam. Their exact species assignment remains to be vague due to inability to investigate the type material. The studied specimens differ from all other species of the genus in presence of only small denticles, not setules, on the sensory seta of antennules. S. cf. fernandoi resembles S. serricauda (Sars, 1901) in presence of large dorsal postabdominal outgrowths but differs from the latter in shorter antennules, lack of a large prominence on the posterior side of antennal basipodite, presence of setules, not small denticles, on the ventral valve margins, more numerous anal teeth in each cluster, and less numerous and thicker clusters of spinules near postero-ventral valve margins. The representatives of S. fernandoi s.l. seem to be widely distributed in tropical Asia, from India to Vietnam, preferring small water bodies. Superficially similar representatives of the genus from Africa probably belong to a yet undescribed new species.
References
Edwards, C. (1980) The anatomy of Daphnia mandibles. Transactions of the American Microscopical Society, 99, 2–24.
Fernando, C.H. & Kanduru, A. (1984) Some remarks on the latitudinal distribution of Cladocera on the Indian subcontinent. Hydrobiologia, 113, 69–76.
Idris, B.A.C. (1983) Freshwater zooplankton of Malaysia (Crustacea: Cladocera). Penerbit University, Pertanian, Malaysia, 153 pp.
Korovchinsky, N.M. (1985) Sarsilatona, a new genus of the family Sididae (Crustacea, Cladocera) with two redescribed species and one new species. Internationale Revue der gesamten Hydrobiologie, 70, 397–425.
Korovchinsky, N.M. (1992) Sididae & Holopediidae (Crustacea: Daphniiformes). Guide to the identification of the microinvertebrates of the continental waters of the world 3. SPB Academic Publishing, The Hague, 82 pp.
Korovchinsky, N.M. & Elias-Gutierrez, M. (2000) First record of Sarsilatona serricauda (Sars, 1901) (Crustacea: Branchiopoda: Sididae) from Mexico, with redescription of its male. Arthropoda Selecta, 9, 1, 5–11.
Korovchinsky, N.M. & Sanoamuang, L. (2008) Overview of Sididae (Crustacea: Cladocera: Ctenopoda) of Northeast and East Thailand, with description of a new species of the genus Diaphanosoma. Zootaxa, 1682, 45–61.
Maiphae, S., Pholpuntin, P., & Dumont, H.J. (2005) Species richness of the Cladocera (Branchiopoda: Anomopoda and Ctenopoda) in southern Thailand, and its complementarity with neighbouring regions. Hydrobiologia, 537, 147–156.
Maiphae, S., Pholpuntin, P. & Dumont, H.J. (2008) Taxon richness and biogeography of the Cladocera (Crustacea: Ctenopoda, Anomopoda) of Thailand. Annales de Limnologie–International Journal of Limnology, 2008, 1, 31–41.
Michael, R.G. & Sharma, B.K. (1988) Indian Cladocera. Fauna of India. Zoological Survey of India, Calcutta, 265 pp.
Monakov, A.V. (1969) The zooplankton and the zoobenthos of the White Nile and the adjoining waters in the Republic of the Sudan. Hydrobiologia, 33, 161–185.
Rajapaksa, R. & Fernando, C.H. (1982) The Cladocera of Sri Lanka (Ceylon), with remarks on some species. Hydrobiologia, 94, 49–69.
Rane, P. (1983) A new species of the genus Latonopsis Sars, 1888 (Cladocera, Sididae) from Madhya Pradesh, India. Crustaceana, 45, 1, 82–84.
Rzoska, J. (1952) Notes on some Cladocera from the Upper White Nile. Annals and Magazine of Natural History, ser. 12, 5, 466–474.
Sa-Ardrit, P. (2002) Diversity and distribution of freshwater Cladocera in Trang Province. M.Sc. Thesis, Prince of Sonkla University, 98 pp.
Sanoamuang, L. (1998) Contributions to the knowledge of the Cladocera of North-East Thailand. Hydrobiologia, 362, 45–53.
Sharma, B.K. & Michael, R.G. (1987) Review of taxonomic studies on freshwater Cladocera from India with remarks on biogeography. Hydrobiologia, 145, 29–33.
Sharma, B.K. & Sharma, S. (1990) On the taxonomic status of some cladoceran taxa (Crustacea: Cladocera) from Central India. Revue d’Hydrobiologie tropicale, 23, 105–113.
Tanaka, S. & Ohtaka, A. (2010) Freshwater Cladocera (Crustacea, Branchiopoda) in Lake Tonle Sap and its adjacent waters in Cambodia. Limnologia (Japan), 11, 171–178.