I mean, really – have you ever seen something like this before?
Melibe engeli is a type of sea slug, and a most unusual one. Its body is partly translucent, and has projections called cerata, themselves covered with smaller projections called papillae, down both sides. The animal is an active hunter – but what a hunter. It lacks the toothy radula seen in most gastropods, & instead has that amazing, extendible, ‘hood’ around its mouth. Tiny, highly-sensitive hairs detect prey & trigger the animal to close the hood; the prey animal is engulfed whole, to die during the digestive process.
I don’t think sci-fi could come up with anything stranger than this!