The concept for "Underwater explorations" series : fav.me/d8h0xc9
which are the fanfiction for "Legacy" comic by Kitfox-Crimson
At left of the picture we can see of my interpretation of the Jayrunner (lemur female, the one of characters from "Legacy" by Kitfox-Crimson), when she joins to underwater expedition in sunken ruins by ancient human civilization.
At right - is the random lemur male in LAMA scuba gear, which was redesigned from human's examples and uses a cryotechnology liquid air storage (with quasiclosed breathing cycle) in backpack, which provides up to 10 hours in underwatwer activity (in quasiclosed mode).
art (c) WLynx - 2015