Phalanx is singular, phalanges is plural, there is no phalange, and mature phalanges are just phalanges.
They specifically are your digits. Pedal phalanges are toes (my 'specialty'), manual phalanges are fingers.
Pubio is an anatomical term that would refer to anything in relation to the pubis.
IF you shoved your foot up someone's ass, you might be able to talk about the pubio-pedal region, but I don't think that's what we're talking about here.
True terror lies in the futility of human existence.
Malcolm Reynolds is my co-pilot.
"The only freedom deserving the name, is that of pursuing our own good in our own way, so long as we do not attempt to deprive others of theirs, or impede their efforts to obtain it. Each is the proper guardian of his own health, whether bodily, or mental and spiritual. Mankind are greater gainers by suffering each other to live as seems good to themselves, than by compelling each to live as seems good to the rest." - John Stuart Mill