Is the Latin 5th and 3th declinations, respectively exemplified by re:s/rei: (fide:s/fidei:) and nube:s/nubis, related to any non-Latin IE equivalent? Latin cane:s "dog" seems to be an augmented form of *can (oddly linked to *k^won-), vulpe:s "fox" seems suspiciously linked to Greek alope:x (*lo:pe:-) (cognates in Armenian, Celtic, Indo-Iranian). How could we explain rabies, scabies, materies, facies, planities, species, etc.
And how about t-theme Latin nouns abie:s (abie:t-) "fir", aries "ram" and paries "wall"?
JS Lopes
Rio