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Sacabambaspis janvieri‭
Sacabambaspis #01
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 #02
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 #03
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.
Sacabambaspis #04
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.
  1. 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.)
  2. Janvier P (1997) Arandaspida. Version 01 January 1997 (under construction). in The Tree of Life Web Project
  3. 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.)
  4. Prehistoric Wildlife(accessed 2019.05.11)