Arandaspis Fossil range: 480–470 Ma PreЄ Є O S D C P T J K Pg N Early Ordovician
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Heterostraci
Genus:	Arandaspis
Species:	A. prionotolepis

Arandaspis prionotolepis is an extinct species of jawless fish that lived in the Ordovician period, about 480 to 470 million years ago. It is the oldest known vertebrate.

Fossil of Arandaspis prionotolepis from Natural History Museum in London.

Its remains were found in Alice Springs, Australia in 1959, but it was not discovered that they were the oldest known vertebrates until the late 1960s. Arandaspis is named after a local Aboriginal tribe, the Aranda (currently called Arrernte).

Arandaspis was about 15 cm (6 in) long, with a streamlined body covered in rows of knobbly armoured scutes. The front of the body and the head were protected by hard plates with openings for the eyes, nostrils and gills. Although it had no jaws, Arandaspis might have had some moveable plates in its mouth, serving as lips, sucking in food particles. The low position of its mouth suggests Arandaspis foraged the ocean floor. It had no fins; its only method of propulsion was its horizontally flattened tail. As a result, it probably swam in a fashion similar to a modern tadpole.^[1]

[edit] References

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