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The Devonian period (419–359 Mya), also known as the Age of Fishes, saw the development of early sharks, armoured placoderms and various lobe-finned fish, including the tetrapod transitional species. The evolution of fish began about 530 million years ago during the Cambrian explosion.
Age determination in fish. Removing an otolith from a red snapper to determine its age. Knowledge of fish age characteristics is necessary for stock assessments, and to develop management or conservation plans. Size is generally associated with age; however, there are variations in size at any particular age for most fish species making it ...
Major groups of fish evolved during this period, often referred to as the age of fish. See Category:Devonian fish. D e v o n i a n: Early Devonian: Early Devonian (419–393 Ma): Psarolepis: Psarolepis (speckled scale) is a genus of extinct lobe-finned fish that lived around 397 to 418 Ma.
The Devonian ( / dɪˈvoʊni.ən, dɛ -/ də-VOH-nee-ən, deh-) [9] [10] is a geologic period and system of the Paleozoic era during the Phanerozoic eon, spanning 60.3 million years from the end of the preceding Silurian period at 419.2 million years ago ( Ma ), to the beginning of the succeeding Carboniferous period at 358.9 Ma. [11]
The Devonian spans from 419 million to 359 million years ago. Also informally known as the "Age of the Fish", the Devonian features a huge diversification in fish such as the jawless conodonts and ostracoderms, as well as jawed fish such as the armored placoderms (e.g. Dunkleosteus), the spiny acanthodians and early bony fish.
In classical interpretations, the symbol of the fish is derived from the ichthyocentaurs, who aided Aphrodite when she was born from the sea. According to some tropical astrologers, the current astrological age is the Age of Pisces, while others maintain that currently it is the Age of Aquarius.
The American paddlefish ( Polyodon spathula, also known as a Mississippi paddlefish, spoon-billed cat, or spoonbill) is a species of ray-finned fish. It is the last living species of paddlefish (Polyodontidae). This family is most closely related to the sturgeons; together they make up the order Acipenseriformes, which are one of the most ...
A fish (pl.: fish or fishes) is an aquatic, ... the "Age of Fishes". Bony fish, distinguished by the presence of swim bladders and later ossified endoskeletons, ...