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).
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.
created in January - April 2019.
- Gagnier PY, Blieck ARM, Rodrigo S G (1986) First Ordovician vertebrate from south America. [abstract] Geobios 19(5):629-634. (DOI: 10.1016/S0016-6995(86)80058-4.)
- Janvier P (1997) Arandaspida. Version 01 January 1997 (under construction). in The Tree of Life Web Project
- Pradel A, Sansom IJ, Gagnier PY, Cespedes R, Janvier P (2006) The tail of the Ordovician fish Sacabambaspis. Biol. Lett. 3, 72-75. (DOI:10.1098/rsbl.2006.0557.)
- Prehistoric Wildlife(accessed 2019.05.11)