Brelimos is quite light for a Zoanoid, but has enormous, sail-like wings; his overall appearance is that of a semi-humanoid moth or butterfly, the size of a hangglider. He appears to have been designed for long-distance flight, rather than maneuverability. His long, feather-like antennae suggest he is highly sensitive to smells and other airborne chemicals.
It's possible that this Zoanoid's type inspired sightings of a cryptic known as mothman due to its moth-like appearance.