| 词条 | Palaeoniscum |
| 释义 |
| name = Palaeoniscum | fossil_range = {{Fossil range|Late Permian}} | image = Palaeoniscus vratislavensis.JPG | image_caption = Palaeoniscum vratislavensis | regnum = Animalia | phylum = Chordata | subphylum = Vertebrata | infraphylum = Gnathostomata | superclassis = Osteichthyes | classis = Actinopterygii | ordo = Palaeonisciformes | genus = Palaeoniscum | genus_authority = Blainville, 1818 | species = P. freieslebeni (type) P. vratislavensis | synonyms = Palaeoniscus }} Palaeoniscum is an extinct genus of ray-finned fish from the Permian period of Europe, North America and South Africa. Palaeoniscum had a torpedo-shaped body {{convert|30|cm|in}} in length, with a deeply forked caudal fin and tall dorsal fin, indicating that it was a fast swimmer. It was probably an active predator, feeding on other fresh water fish. Its sharp teeth could be replaced when lost, a trait also seen in modern day sharks. Like other early ray-finned fish, Palaeoniscum had air sacs connected to the mouth which served as a primitive swim bladder.[1]References{{Portal|Paleontology}}1. ^{{cite book |editor=Palmer, D.|year=1999 |title= The Marshall Illustrated Encyclopedia of Dinosaurs and Prehistoric Animals|publisher= Marshall Editions|location=London|page= 36|isbn= 1-84028-152-9}} {{Taxonbar|from=Q429002}}{{Palaeonisciformes-stub}} 6 : Prehistoric ray-finned fish genera|Permian bony fish|Palaeonisciformes|Permian fish of Europe|Permian fish of North America|Fossil taxa described in 1818 |
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