Here, we describe four new species of Crellidae Dendy, 1922 and discuss characters and relationships from published molecular phylogenies including crellid sponges. New species proposed are Crella (Pytheas) chiloensis Fernandez, Gastaldi, Pardo & Hajdu,

Two new species of Crellidae Dendy, 1922 from the east coast of Canada are described. The first is Crella (Pytheas) cutis sp. nov., a massively encrusting species of Crella (Pytheas) collected from depths of 84 to 249 m in the Gulf of St. Lawrence and

Crellidae Dendy (Demospongiae, Poecilosclerida) are characterized by a tangential ectosomal crust made up of acanthostyles or acanthoxeas. Prior to the present revision, Crellidae were a substantial group with 22 nominal genera. However, structural