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The nostrils are nor clearly located, but could have been situated between the eyes. Ventrally, the ventral lip of the mouth is armed with lengthy collection of small oral plates which recall these of heterostracans. In the anterior a part of the dorsal defend are two, closely-set holes, which have been considered a paired pineal opening, however that are more doubtless the external openings of the endolymphatic ducts. They opened between the diamond-shaped platelets which separate the dorsal from the ventral defend. Sacabambaspis is an extinct genus of