Poraspis

Poraspis; Temporal range: Late Silurian–Lower Devonian PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Pteraspidomorphi
Subclass:	Heterostraci
Order:	Cyathaspidiformes
Suborder:	Cyathaspidida
Family:	Cyathaspidae
Genus:	Poraspis; Kiær, 1930

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Poraspis is an extinct genus of heterostracan.^[1] Fossils are found in Late Silurian and Early Devonian marine strata of Norway, Canada and the United States.

References

^ David K. Elliott & Michael A. Petriello (2011). "New poraspids (Agnatha, Heterostraci) from the Early Devonian of the western United States". Journal of Vertebrate Paleontology. 31 (3): 518–530. doi:10.1080/02724634.2011.557113.

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[1] David K. Elliott & Michael A. Petriello (2011). "New poraspids (Agnatha, Heterostraci) from the Early Devonian of the western United States". Journal of Vertebrate Paleontology. 31 (3): 518–530. doi:10.1080/02724634.2011.557113.

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