Dacha

The Dacha was a Silurian that mostly resembled the "warrior" caste of which Vastra was from, except for the third eye which appeared on the other silurian sub-species, which were termed the "Scholar" caste. (COMIC: The Lost Dimension)

Trivia
In the audio story Call to Arms, it was implied by the silurian, Jastrok, that the warrior caste originally had a third eye like the scholar subspecies.