Abstract
a genus of early pteraspidimorph craniates in the order Arandaspidiformes, closely related to Arandaspis and among the earliest whole-body specimens of ostracoderms. Jawless and 10 inches long, it had a laterally flattened body and an extended tail with a small fin web at the end, but no paired fins. Its head was armored with bony plates and the body was covered with scales. First found in Bolivia, it is known from several Gondwanan locations: Argentina, Australia, and the Arabian Peninsula; Middle to Late Ordovician.
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Carlton, R.L. (2018). S. In: A Concise Dictionary of Paleontology. Springer, Cham. https://doi.org/10.1007/978-3-319-73055-4_19
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DOI: https://doi.org/10.1007/978-3-319-73055-4_19
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