Pituriaspida
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The Pituriaspida are a small group of nose spiked jawless fishes, which lived in the marine, deltaic environments of Middle Devonian (about 390 Ma). They are known only by two genera, Pituriaspis and Neeyambaspis found in a single sandstone location in Queensland, Australia.
The better studied genus - Pituriaspis, which resembles the Osteostraci, has an elongate headshield. It extends posteriorly to form a long abdominal division which probably reached the anal region. The exoskeleton is ornamented with tiny rounded tubercles. The only unique characteristic of the Pituriaspida is a peculiar pit, of unknown function, located ventrally to the orbits. Almost nothing is known of the rest of the body.
See also
- http://tolweb.org/tree?group=Pituriaspida
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