Geobia

The genus Geobia has a very elongated body. The only species in the genus, Geobia subterranea, has several adaptations for a subterranean lifestyle, such as lack of eyes, pigments, and creeping sole, i.e., the ventral side has only some sparse cilia, unlike most other genera. The cutaneous musculature is very strong,^[1] especially in the anterior region,^[2] possibly as an adaptation due to its burrowing habits.

The copulatory apparatus of Geobia has a permanent but small penis and an elongated prostatic vesicle. The female canal enters the genital antrum dorsally.^[2]

Geobia subterranea is found in areas covered by the Atlantic Rainforest in Brazil. Its known distribution includes the states of Rio de Janeiro, São Paulo and Santa Catarina.^[3]

It is known to feed on earthworms,^[2] attaching its body to the prey and sucking the contents after releasing digestive enzymes. The planarian's colorless body usually acquires a brownish or pinkish tinge after a meal due to the gut contents.