Pituriaspida

Pituriaspida Temporal range: Middle Devonian
Reconstruction of Neeyambaspis enigmatica and Pituriaspis doylei.
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Subphylum:	Vertebrata
Class:	†Pituriaspida Young 1991
Order:	†Pituriaspidiformes
Family:	†Pituriaspididae
Genera
†Pituriaspis †Neeyambaspis
Synonyms
Neeyambaspididae Davis 1994

The mouth, gill openings and presumably the nasal aperture were all situated on the ventral side of the head. Well-developed paired fins attached on either sides of the headshield. The only diagnostic feature of pituriaspids is an enigmatic pit adjacent to the eyes. – Philippe Janvier

The Pituriaspida ('Pituri-shield' or 'hallucinogen-shield') are a small group of extinct armored jawless fishes with tremendous nose-like rostrums, which lived in the marine, deltaic environments of Middle Devonian Australia (about 393.3—382.7 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 translated as 'hallucinogenic shield.' Pituri is a hallucinogenic drug, made from the leaves of the Corkwood Tree and Acacia ash, and 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.

References

• Janvier, Philippe. Early Vertebrates. Oxford, New York: Oxford University Press, 1998 (ISBN 0-19-854047-7).
• Long, John A. The Rise of Fishes: 500 Million Years of Evolution. Baltimore: The Johns Hopkins University Press, 1996 (ISBN 0-8018-5438-5).

External links

• Pituriaspida