Based on a morphological re-investigation of Baylisiella tecta (Linstow, 1892) this species is removed from the family Diphyllobothriidae Luhe, 1910. A new family Baylisiellidae Jurachno et Maltsev fam. n. and a new superfamily Baylisiellioidea Jurachno et Maltsev superfam. n. are based on this species