Italo-Western languages
Italo-Western is, in some classifications, the largest branch of the Romance languages. It comprises two of the branches of Romance languages: Italo-Dalmatian and Western Romance. It excludes the Sardinian language and Eastern Romance.
Based on mutual intelligibility, Dalby lists four languages: Corsican, Italian (Tuscan–Central), Napolitan–Sicilian, and Dalmatian.
Dalmatian Romance
The Dalmatian language was spoken in the Dalmatia region of Croatia. It became extinct in the 19th century.
The Istriot, spoken on the Istrian peninsula of Croatia, Slovenia, and Italy.
Central-Southern Italian
The Tuscan language includes Standard Italian and various forms of Regional Italian.
The Corsican language is related to Tuscan and has the dialects of Gallurese and arguably Sassarese.
The Central Italian languages, or Latin-Umbrian-Marchegian, include the varieties of Romanesco and Marchigiano.