Proto-Southern ~

Pluralisation
In Proto-Southern ~, the plural form -m was made redundant, replaced by a system of ablaut that would become common in most languages in the region, including Catulerīae (although the plural -m was preserved in many cases). The loss of this plural form led to the reframing of many plural forms as singular forms which otherwise would have been omitted. For example, the accusative singular of -us nouns was -ām, rather than the expected -0.