M'klexa
The M'klexa were a warp-capable civilization who had visited Valakis as of 2150.

Prior to meeting the Humans, the Valakians were visited by two warp-capable species, the M'klexa and the Ferengi, both of whom were either unable or unwilling to help the Valakians.

As of 2151, T'Pol was not familiar with this species. ()

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Species