Neocoelia was named by Pickett (1982) [Homonym, corrected by Pickett (1982) as Vaceletia Sepkoski's age data: T Eo-u R]. It is extant. Its type is Neocoelia crypta. It is the type genus of Vaceletiidae.

It was corrected as Vaceletia by Pickett (1982), Vacelet (2002), Sepkoski (2002), West et al. (2015), Senowbari-Daryan and Rigby (2015).

It was assigned to Cryptocoeliidae by Pickett (1982); to Verticillitida by Sepkoski (2002); to Verticillitidae by Vacelet (2002); to Vaceletiidae by West et al. (2015); and to Verticillitinae by Senowbari-Daryan and Rigby (2015).