Present and past occurrence of members of the genus Filinia Bory de St. Vincent, 1826 (Testudinellidae Rotatoria) in Lake Balaton

Sebestyén, Olga (1974) Present and past occurrence of members of the genus Filinia Bory de St. Vincent, 1826 (Testudinellidae Rotatoria) in Lake Balaton. A Magyar Tudományos Akadémia Tihanyi Biológiai Kutatóintézetének évkönyve, 41. pp. 289-315. ISSN 0365-3005

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Abstract

Filinia (active state) inhabits the open water of Lake Balaton in the cold-water season (1902-1973). Neither figures nor measurements referring to single individual exists on Balaton Filinia with the exception of population No 423 (18. 1. 1956), which proved to be a homogenous one of the taxon Filinia terminális Plate 1866 f. maior Colditz 1914. Resting eggs are known from both plankton and neuston. Remains from the sediments showing th at Filinia inhabits Lake Balaton continuously since the initial period of the formation of Lake Balaton. This suggests that environmental conditions were always suitable for floating forms viz. plankton. Attention is called 1. to investigate recent populations in Lake Balaton using modern key to clear up taxonomic relation on a broader basis (Pejler , Hutchinson, Ruttner-Kolisko), 2. on the importance of the winterplankton in this shallow and throughout the year well aerated lake by reinvestigating the observations of Náday, the author first noting Filinia in this lake.

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