hypogean

The cave is also home to hypogean fishes.

Trichomycterids are one of the most successful groups to occupy cave habitats; it contains twelve hypogean species.

The opposite terms are hypogean, hypogeic and hypogeous.

Deep hypogean environments can host autonomous ecologies whose primary source of energy is not sunlight, but chemical energy liberated from limestone and other minerals by chemoautotrophic bacteria.

Six of the hypogean species are of the genus Trichomycterus: Trichomycterus chaberti, T. itacarambiensis, T. santanderensis, T. spelaeus, and T. uisae.

These hypogean stresses had their parallels on the planetary surface, where carpets of colour sprang from the old icefields, green spears thrusting up before the last dregs of snow rotted into the soil, so urgently did Freyr call them forth.