Arandaspis is a primitive vertebrate, lived in the Ordovician period ^{2), 4), 5)}, around 480 millions years ago ³⁾. Arandaspida as well as Sacabambaspis are classified to the class Pteraspidomorphi (a group of extinct early jawless fish) ²⁾.

They are about 15cm in length ^{1), 3), 4)}, and have two‭ dermal bone sheilds which provide support for the body as well as protection ⁴⁾.

There are a gap between two shields, where eyes and external gills open ^{2), 4)}.

Since Arandaspis had no jaw, it might have swum with opened mouth and might have filtrated organic matters or smaller organisms ⁴⁾. They may have lived behind scattered pebbles.

The posterior half of the body is missing from the fossil, so the structure of the fins is unknown ¹⁾.

It seems that Arandaspis was not a good swimmer, propelled itself with undulating tail (and head) movement ⁴⁾.