Humanoid species. The Enterprise NX-01's Dr. Phlox is Denobulan. The Denobulans hail from the system Denobula Triaxa, and only require six days of sleep per year (though, according to Dr. Phlox, two will suffice). It is common for Denobulans to have multiple spouses — Phlox has three wives, who, in turn, each have two other husbands. Mating among this species is apparently very complex compared to human traditions, yet most Denobulans do not like to be touched.