Banfiidae is a family of extinct banffozoan animals from North America and China.

[3] A Heteromorphus-like dwarf "Form A" is allied with this group at the class level, but has not been formally described or assigned to this family.

[2] Skeemella has been found in the Pierson Cove and Marjum Formations, both above the Wheeler Shale and also in western Laurentia.

[10] A comprehensive phylogenetic revision in 2007 expanded Banffozoa to encompass the proposed class Heteromorphida (which had excluded Banffia), and placed Heteromorphus in the Banffiidae.

[1][2][8] A 2024 study has found the Banffiidae to form the earliest part of the paraphyletic stem-chordate evolutionary grade, as shown in this simplified cladogram:[13] Banffia† Heteromorphus† Skeemella† Nesonektris† Vetulicolidae† Didazoon† Pomatrum† Yuyuanozoon† Yunnanozoon† Cathaymyrus† Pikaia† Chordata(crown group) An earlier study in 2014 placed vetulicolians as the sister-group of tunicates, but was unable to resolve any relationships among vetulicolians as a group:[14] Vetulicola† Beidazoon† Ooedigera† Pomatrum† / Xidazoon† Didazoon† Yuyuanozoon† Banffia† Heteromorphus† Nesonektris† Tunicata