WASHINGTON (SBG) – Two new species of shark have been discovered in the Indian Ocean.

Researchers at Newscastle University found them while investigating fisheries off the coasts of Madagascar and Zanzibar. The creatures, known as "sawsharks", can reach up to 1.5 meters in length and have snouts with teeth that alternate in size, according to the release. 

CNN reports neither of these two species have been spotted alive in the wild.

“The discovery re-enforces both how important the western Indian Ocean is in terms of shark and ray biodiversity, but also how much we still don’t know," said Dr. Andrew Temple, Research Associate at Newcastle University.

The rarely seen six-gilled sharks have a pair of "barbels" in the middle of the snout, sensory organs that help the animals detect prey, researchers say.