Key to sessile gnesiotrochan rotifers: Families, monospecific species in Flosculariidae, species of Atrochidae, Conochilidae, and Limnias Author Davies, Natalie Department of Biology, Ripon College, Ripon, WI, 54971, USA Author Lafleur, Alexandre Department of Biology, Ripon College, Ripon, WI, 54971, USA Author Hochberg, Rick University of Massachusetts Lowell, Lowell, MA, 01854, USA Author Walsh, Elizabeth J. Department of Biological Sciences, University of Texas at El Paso, El Paso, TX, 79968, USA Author Wallace, Robert L. Department of Biology, Ripon College, Ripon, WI, 54971, USA text Zootaxa 2024 2024-01-08 5397 4 497 520 http://dx.doi.org/10.11646/zootaxa.5397.4.3 journal article 284552 10.11646/zootaxa.5397.4.3 2c1aad6c-620c-428e-8c95-8781c688f7ca 1175-5326 10469053 3EE9F78B-0133-4466-872C-F14CEF87E928 Dichotomous key to families of the Flosculariaceae 1 Adults planktonic, within a loose gelatinous matrix; colonies vary from 1 adult with ≥ 1 juveniles to> 300 individuals; trophi unique: asymmetrical unci, teeth of left uncus much longer than on the right................ Conochilidae Harring, 1913 1’ Adults sessile, facultative sessile, or planktonic animals, usually within a tube of varied construction (gelatinous, pipes, or pellets); solitary or in intra- or inter-species colonies; trophi not as above, either symmetrical or asymmetrical, with teeth of right uncus much longer than on the left............................................ Flosculariidae Remane, 1933