Perfodiolophus subterraneus
This grub-like descendant of Oculolophus caecus is evolving to spend its time underneath the ground and not on the surface. This is to avoid competition and predation from more "advanced" species within its zone. Oculolophus subterraneus has learned to use its crest for burrowing underground by moving its head up-and-down to move dirt out of the way, and it has succeeded in surviving so far. It is lighter as it no longer needs a high amount of pigments to protect its skin from the sunlight, and all of its moisture is gained and absorbed underground.
Unlike in its relatives at the surface, the crest muscles in Oculolophus subterraneus do not move up-and-down involuntarily. This is to avoid getting dirt lodged up inside, which is not fatal but jams up the echolocation system and messes with coordination, but the drawback is that it has to rely on its senses of touch and chemoreception to navigate. However, they instead move up-and-down to allow the crest to chop apart the roots of Aruraherba caesicoles underground, which are cut up into individual pieces small enough to swallow.
Oculolophus subterraneus matures at four (4) weeks of age due to its smaller size of fifteen centimeters (15 cm) in length, which helps it to fit in and navigate the soil better while increasing the population cap. They try to hook up with any mates they come across and males will release their sperm into the other's cloaca. Females lay twenty-five (25) eggs like their ancestor, the number unaffected due to their unique niche and general lack of predation, although those who spend too long on the surface out of the ground risk being eaten by Oculolophus panivore. They do not have any complex burrow structures, but dig tunnels between five and twenty centimeters (5-20 cm) under the surface in uncoordinated directions which are around the width of their bodies. The soil dug up by their crests falls underneath and the moving of the head brings it closer to its body and is then spread out by its movements.