Soluta is an extinct class of echinoderms that lived from the Middle Cambrian to the Early Devonian.

Soluta is one of the four "carpoid" classes, alongside Ctenocystoidea, Cincta, and Stylophora, which made up the obsolete subphylum Homalozoa.

Most solutes were free-living, but the basal solutan Coleicarpus used its homoiostele as a holdfast, as did juvenile Castericystis.

[2][3] Coleicarpus Castericystis Minervaecystis Girvanicystis Dendrocystites Maennilia Heckericystis Dendrocystoides Claritacarpus Rutroclypeus Iowacystis Scalenocystites Syringocrinus Myeinocystites Belemnocystites The phylogenetic position of Soluta is contentious.

[7] Another hypothesis holds that they are specialized descendants of radiate echinoderms which lost radial symmetry, likely belonging to Blastozoa.