The Pituriaspida ("Pituri Shield") are a small group of armored jawless fishes with tremendous nose-like rostrums, which lived in the marine, deltaic environments of Middle Devonian Australia (about 390 Ma). They are known only by two species, Pituriaspis doylei and Neeyambaspis enigmatica found in a single sandstone location of the Georgina Basin, in Western Queensland, Australia.
"Pituriaspida" is often mistranslated as "hallucigenic shield." "Pituri" is actually a specific kind of hallucigenic drug, made from the leaves of the Corkwood Tree and Acacia ash, used by local Aborigine shamans for vision quests. The pituriaspids' discoverer, Dr Gavin Young, named Pituriaspis after the drug, because, upon examining the first specimens, he suspected he was hallucinating (Long, p 59). The better studied species - Pituriaspis doylei, which had a superficial resemblance to the Osteostraci, had an elongate headshield, that, coupled with its spear-like rostrum, gave it a throwing-dart-like appearance. Neeyambaspis enigmatica had a much smaller and shorter rostrum, and a more triangular headshield, making it look as though it were a guitar pick with a tail (when it was alive, that is).