What is "kittlidiscidae"

Kittlidiscidae is an extinct family of Middle Triassic gastropods in the superfamily Pleurotomarioidea, named to contain the genus Kittlidiscus and included in the Vetigastropoda.

Note that Bouchet & Rocroi, 2005 gives Vetigastropoda simply as a clade, which not being paraphyletic, it also is, leaving taxonomic ranking to a future date. Other gastropod classifications, including those subsequent, have determined that the Vetigastropoda is a superorder.