Sacabambaspis janvieri is a marine jawless fish found from the Ordovician formation of Bolivia, and a species of the same extinct class Pteraspidomorphi as Arandaspis ^{1), 2)}.

Sacabambaspis was about 25cm in length ⁴⁾, and its head was coverd with dorsally flattened and ventrally inflated shields ³⁾. There were arrays of diamond-shaped platelets separating the dorsal and ventral shields, and the gills perhaps have opened between these platelets ²⁾.

A pair of eyes which was surrounded by a sclerotic ring was located on front of the head like car head lamps ²⁾. Sacabambaspis seems to have had a lateral line just like extant fishes ⁴⁾.

Sacabambaspis may have been feeding remains of other organisms or some organic materials in the seabed segiments because of having no jaws. There is also a possibility of having sucked water and mud by mouth, and filtered some prey item from them.

The tail of Sacabambaspis is hypocercal, namely, a relatively large dorsal web, a small ventral web, and an elongated notochodal lobe ended by a small fin web ³⁾. Perhaps, Sacapambaspis may not have been a good swimmer.