As adjectives the difference between infaunal and faunal
is that infaunal is belonging to the infauna while faunal is pertaining to animals.
infaunal
English
Adjective
(-)
Belonging to the infauna.
faunal
English
Adjective
(-)
Pertaining to animals.
Pertaining to a specific fauna of a given region or time.
Usage notes
A technical term; in conversation, one instead uses animal attributively.
Hyponyms
* bestial