Early Silurian

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You may be looking for Middle Silurian or Late Silurian.

Early Silurians were a Silurian subspecies identified by historians who had been allowed access to the "Monster Vaults" of the databanks in the Doctor's TARDIS. (PROSE: The Monster Vault [+]Loading...["The Monster Vault (novel)"]) The corpse of one such Silurian was recognised by Vastra, a Late Silurian, as being of "scholar caste"; she in turn was identified on sight as a warrior by other Early Silurians. (COMIC: The Lost Dimension [+]Loading...["The Lost Dimension (comic story)"])