Sometimes you can seemingly have 'biome complete' in all planet areas but still not have all the flora or fauna. If that happens there's basically a biome you haven't found yet.

This portion will cover the biomes in the game. Subnautica: Below Zero has several biomes with distinct flora and fauna, environmental conditions and resources.

While some Fauna, Flora, Resources, and Traits can be found in multiple biomes, completing a biome before moving on to another will help make sure nothing is skipped over.

Volcanic Biome: Kreet is mainly a volcanic planet, and as such, this biome makes up most of the planet’s surface and explorable area. This biome contains Dust Root flora and all three fauna ...

The Deep Lilypads Cave is most easily accessed by using the channel underneath the largest rock with broken Architect cabling. This biome is home to many flora and fauna, including Sea Monkeys, as ...