https://cameradb.review/wiki/T....he_Tail_Of_The_Ordov
In the anterior part of the dorsal defend are two, closely-set holes, which have been thought to be a paired pineal opening, however that are more doubtless the exterior openings of the endolymphatic ducts. They opened between the diamond-shaped platelets which separate the dorsal from the ventral protect. Sacabambaspis is an extinct genus of jawless fish that lived within the Ordovician period. Sacabambaspis lived in shallow waters on the continental margins of Gondwana.[1] It is the best recognized arandaspid
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