Conus fonsecai is a species of sea snail, a marine gastropod mollusk in the family Conidae, the cone snails, cone shells or cones.
These snails are predatory and venomous. They are capable of "stinging" humans.
The length of the shell varies between 12 mm and 17 mm.
This marine species of cone snail occurs off the Rio Grande do Norte State, Northeast Brazil
