Plagiuri

{{Short description|Early subclassification of fish}}

Plagiuri is an early (now disused) biological subclassification of fish (for example in Peter Artedi's Ichthyologia, and in early editions of Linnaeus's Systema Naturae). The term was invented by Artedi,Artedi, P. (1738). [https://www.biodiversitylibrary.org/item/194433#page/157/mode/1up Ichthyologia: Phylosophia Ichthyologica: 53(152)]Romero, A. & Keith, E.O. (2012). [https://books.google.com/books?id=Iu6dDwAAQBAJ&pg=PA24 New approaches to the study of marine mammals: 24] and is derived from the Greek {{lang|grc|πλαγιος}} (plagios; transverse) and {{lang|grc|ουρα}} (oura; tail).Rees, A. (1819). [https://www.biodiversitylibrary.org/item/119401#page/529/mode/1up The Cyclopaedia; or Universal Dictionary of Arts, Sciences, and Literature, vol. 27: PLA] The Pisces Plagiuri included those animals then classed as fish whose tails' flat surfaces faced anatomically up and down and not sideways. Its members have now been shown to be mammals (including the whales and manatees).