Name: Perleidus ‭(‬Perledo teeth‭? ‬Named after the Italian town of Perledo where the first known remains were found‭)‬.‭
Phonetic: ‭P‬er-ley-dus.
Named By: Deecke‭ ‬-‭ ‬1911.
Synonyms: Dimorpholepis,‭ ‬Semionotus altolepis.
Classification: Chordata,‭ ‬Actinopterygii,‭ ‬Perleidiformes,‭ ‬Perleididae.
Species: P. altolepis,‭ ‬P. lehmani,‭ ‬P. lutoensis,‭ ‬P. sinensis,‭ ‬P. stoschiensis,‭ ‬P. woodwardi,‭ ‬P. yangtzensis.
Diet: Carnivore.
Size: About‭ ‬15‭ ‬centimetres long,‭ ‬some variation between species.
Known locations: Across Europe,‭ ‬Asia North America,‭ ‬North Africa and Madagascar,‭ ‬potentially worldwide.
Time period: Triassic.
Fossil representation: Multiple individuals usually preserved flat upon stone slabs.

       What had started in genera such as Canobius towards a better adapted open water predator form,‭ ‬Perleidus continued into the Triassic.‭ ‬Like earlier yet fairly recent‭ ‬for the time‭ ‬forms,‭ ‬Perleidus had a lower jaw that was suspended directly below the skull so that the mouth could be opened very wide,‭ ‬allowing for larger prey capture.‭ ‬Perleidus however had new developments of their own though.‭ ‬The fins of Perleidus had a reduced number of spines supporting them,‭ ‬and those still present were much more robust than previous older fish forms.‭ ‬This reduction and development meant that the fins of Perleidus were still robust enough to function,‭ ‬yet much more flexible.‭ ‬Combined with a tail that had roughly equal upper and lower lobes,‭ ‬Perleidus would have been among the fastest and most manoeuvrable fish swimming in the waters of the Triassic.‭

Further reading
- ‬Triassic Fishes from Spitzbergen,‭ ‬Part I‭ ‬-‭ ‬E.‭ ‬A.‭ ‬Stensiö‭ ‬-‭ ‬1921.
-‭ ‬Triassic Fishes from East Greenland collected by the Danish expeditions in‭ ‬1929-1931‭ ‬-‭ ‬E.‭ ‬Stensiö‭ ‬-‭ ‬1932.
-‭ ‬A New Species of Perleidus from Anhui.‭ ‬-‭ ‬D.‭ ‬Su‭ ‬-‭ ‬1981.
-‭ ‬Osteichthyes,‭ ‬in Triassic Fishes from the Cassange Depression‭ (‬R.‭ ‬P.‭ ‬De Angola‭) ‬-‭ ‬B.‭ ‬Schaeffer‭ ‬-‭ ‬1990.
-‭ ‬A new species of the genus Perleidus‭ (‬Actinopterygii:‭ ‬Perleidiformes‭) ‬from the Middle Triassic of Southern China.‭ ‬-‭ ‬C.‭ ‬Lombardo,‭ ‬Z.‭ ‬Y.‭ ‬Sun,‭ ‬A.‭ ‬Tintori,‭ ‬D.‭ ‬Y.‭ ‬Jiang‭ & ‬W.‭ ‬C.‭ ‬Hao‭ ‬-‭ ‬2011.


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