Where does “rubicundulus” come from?

rubicundulus (Latin) comes from Latin -ulus, from Proto-Italic -olos, from Proto-Italic -elos, from Proto-Indo-European -e-lós, from Proto-Indo-European -lós — Forms agent nouns from verbal roots.

Ancestry of “rubicundulus”, step by step

Step	Language	Word	Meaning
1	Latin	-ulus	Used to form a diminutive of a noun, indicating...
2	Proto-Italic	-olos	—
3	Proto-Italic	-elos	Forms desubstantival and deadjectival diminutive nouns
4	Proto-Indo-European	-e-lós	—
5	Proto-Indo-European	-lós	Forms agent nouns from verbal roots

Every word from Proto-Indo-European -lós →Every word from Latin -ulus →Every word from Proto-Italic -elos →