Gobius tetrophthalmus
Gobius tetrophthalmus is a species of marine fish from the family Gobiidae, the true gobies. It occurs in the Atlantic Ocean around Cape Verde, western Africa, where it is found at depths from . It prefers areas with coralline algae though it will also inhabit areas with substrates of sand and rock. This species can reach a length of  TL. It is harmless to humans. References

tetrophthalmus
Fish of West Africa
Endemic vertebrates of Cape Verde
Tropical fish
Fish described in 2001