Caecosphaeroma is a troglodytic isopod genus in the family Sphaeromatidae found in caves of NE and SW France.

As cave dwellers, they have lost their vision, but remain sensitive to light, which they shun.

Larva remain in the marsupium about 12 months,[2] and the animals continue growing for several years, reaching a final length of 10–20 mm.

The marine ancestors of Caecosphaeroma are believed to have migrated up the course of rivers and adapted to a subterranean environment that was relatively stable; meanwhile the marine environment of their ancestors changed, so Caecosphaeroma continued to differentiate as a separate lineage.

The mandibular palps and antennae are able retract into two deep grooves of the face, and the posterior margin of pleotelson (the last body segment fused with the "tail") provides greater mechanical support for the head.