Limnactiniidae with the body not divisible into regions. Column smooth, without cuticle and tenaculi. Proximal end rounded, physa-shaped, perforated by apertures. Distal part of the column with spirocysts. No sphincter, no tentacles. Siphonoglyphs indistinct. Mesenteries divisible into macro- and microcnemes. Perfect and fertile mesenteries 8-10 (8 mesenteries arranged as the macrocnemes in Edwardsia + sometimes the dorsolateral couple). Retractors of the perfect mesenteries strong, restricted more or less reniform. Parietal muscles rather weak. The long ciliated tracts of the filaments may be discontinuous. Cnidom: spirocysts, basitrichs, microbasic p-mastigophors
L. laevis Carlgren 1921
L. nuda Carlgren 1927
Definitions and contained taxa are those of Oscar Carlgren as published in 1949 : Kungl Svenska Vetenskapsakadamiens Handlingar, Series 4, Volume 1, Number 1
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