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From Warhammer 40k - Lexicanum
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→Biology
===Biology===
[[Image:TauXenology.jpg|thumb|right|200px|The dissection of a [[Tau]] [[Ethereal]] as conducted by [[Magos Biologis]] [[Sharle Darvus]] working under the orders of [[Inquisitor]] [[Parnival Gründvald]]{{Fn|1}}]]
On their foreheads resides a small unnamed diamond-shaped organ with a rigid carapace that contains ultra-dense hormonal fluids which emits an overpowering scent. The rear ganglia of their brains connects to their central lobe, and their head also contains polyp-structures vaguely reminiscent of pheromone glands amongst Terran [[Terra]]n invertebrates. Comparative Imperial studies of members of other Tau castes show the ethereals have a comparatively smaller olfactory cavities. [[Magos Biologis]] [[Sharle Darvus]], having dissected a Tau Ethereal, speculates this organ to play a role in controlling other castes via a pheromonal communication system or chemical 'signifiers'{{Fn|1}} although it is possible the means of control is more esoteric in nature{{Fn|4}}
===Ranks===