Fenestraspis is an extinct genus of trilobite in the order Phacopida. Fenestraspis is unusual because of the development of extensive fenestrae in the posterior part of the body and apparently of the thorax, the presence of upwardly directed spines on the cephalon, thorax and pygidium, and the exceptionally large and highly elevated eyes.
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Holloway, D.J., Carvalho, M. (2009). The Extraordinary Trilobite Fenestraspis (Dalmanitidae, Synphoriinae) From The Lower Devonian Of Bolivia. Palaeontology, Volume 52 Issue 4, Pages 933 - 949
