One-hundred five rotifer species were identified from a sandy, plains river in Kansas, USA (the Ninnescah river) . Of those rotifers identified, eighty occurred only in the interstitial sand, fifty-six in only the flow as plankton, and thirty-one from both habitats . Most species can be characterized as being more commonly found in littoral habitats, and not the interstitial or plankton . Lecane inermis (Bryce, 1892) had the highest density in the hygropsammon interstitial with an average 401 ind . 10 cm -3 at 1-3 cm depth in September 1993 .New records for the US include Encentrum wiszniewski Wulfert (1939), E. longidens Donner (1943) and E. (Parencentrum) longipes Wulfert (1960) . A small form of Lecane levistyla Olofsson (1917) is further examined and discussed .
A new rotifer is described from among samples taken from coastal lakes in southeastern Brazil. Comparisons to related rotifers are made. This new animal belongs to the Hexarthra mira-intermedia species group by way of its general morphological configuration, the number of teeth in the trophi ( 9 , and the two club-shaped caudal appendages (CSCA's). An extremely long dorsal antenna and very long setae extending from the bend in the ventro-lateral arm characterize this animal's speciation.
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