Perleidus

Perleidus is an extinct genus of ray-finned fish from the Triassic period. Fossils have been found worldwide.

Perleidus was a freshwater predatory fish, about 15 centimetres (5.9 in) in length. Its jaws hung vertically under the braincase, allowing them to open wide, a feature it shared with the earlier palaeonisciform fish, from which it may have been descended. Unlike those earlier fish, however, Perleidus and its relatives had highly flexible dorsal and anal fins, with a reduced number of fin rays. This would have made the fish more agile in the water.

单词	Perleidus
释义	Perleidus 英语百科 Perleidus Perleidus is an extinct genus of ray-finned fish from the Triassic period. Fossils have been found worldwide. Perleidus was a freshwater predatory fish, about 15 centimetres (5.9 in) in length. Its jaws hung vertically under the braincase, allowing them to open wide, a feature it shared with the earlier palaeonisciform fish, from which it may have been descended. Unlike those earlier fish, however, Perleidus and its relatives had highly flexible dorsal and anal fins, with a reduced number of fin rays. This would have made the fish more agile in the water.
随便看	triode, dielectric的意思 triode driver的意思 triode etcher的意思 triode field effect transistor的意思 triode gas laser的意思 triode gate的意思 triode gauge的意思 triode generator的意思 triode gun的意思 triode heptode的意思 triodeheptode的意思 triodehexode的意思 triode hexode的意思 triode ion gauge的意思 triode ionization gage的意思 triode ion pump的意思 triode laser的意思 triode mixer的意思 triode oscillator的意思 triode osclllator的意思 triode peak detector的意思 triode pentode的意思 triodepentode的意思 triode的意思 triode smplifier的意思