[Would not the Taenia be folium?]

The name of Taenia solium is a problem for the latinists because solium cannot mean solitary. In some incunabula, appears the word folium. Because they studied latin and parasitology and because they know the possibility to confuse the s and the f in the gothic types, the authors are convinced, that the segment of the tapeworm, in the Breviarium attributed to Arnau de Vilanova, from which is originated the name of this worm was compared to a leaf (folium).