Where does “fascipennis” come from?

fascipennis (Latin) comes from Latin penna, from Proto-Italic petnā, from Proto-Indo-European péth₂r̥, from Proto-Indo-European peth₂- — to spread out; to fly.

fascipennis (Latin): having a band of colour on the wing

Definitions

having a band of colour on the wing

Ancestry of “fascipennis”, step by step

fascipennis traces back through two separate lines of ancestry.

via Latin penna

Step	Language	Word	Meaning
1	Latin	penna	wing; feather, especially a flight-feather;...
2	Proto-Italic	petnā	feather; wing
3	Proto-Indo-European	péth₂r̥	wing; feather
4	Proto-Indo-European	peth₂-	to spread out; to fly

via Latin fascia

Step	Language	Word	Meaning
1	Latin	fascia	band, bandage, swathe, strip, ribbon; necktie
2	Proto-Indo-European	bʰasḱ-	bundle, heap, load

Every word from Proto-Indo-European peth₂- →Every word from Proto-Indo-European péth₂r̥ →Every word from Proto-Italic petnā →