puffer fish skeleton extended

$19.99 to $34.99 In Stock. [63][64], In 2011, researchers at Monash University in Australia used primitive but still living lungfish "to trace the evolution of pelvic fin muscles to find out how the load-bearing hind limbs of the tetrapods evolved. Bony fish have fin spines and rays called lepidotrichia. [62] Much of the genetic machinery that builds a walking limb in a tetrapod is already present in the swimming fin of a fish. [32] Some fishes, such as puffer fish, filefish and trunkfish, rely on pectoral fins for swimming and hardly use tail fins at all.[34]. Fins typically function as foils that produce lift or thrust, or provide the ability to steer or stabilize motion while traveling in water, air, or other fluids.Fins are also used to increase surface areas for heat transfer purposes, or simply as ornamentation.. Fins first evolved on fish as a means of locomotion. However, there was little evidence of a lateral fold-to-fin transition in the fossil record. By contrast, most bony fish possess a homocercal caudal fin.[19]. "[78], The biologist Stephen Jay Gould said the ichthyosaur was his favorite example of convergent evolution.[79]. [82] In 2005, the Sea Life London Aquarium displayed three robotic fish created by the computer science department at the University of Essex. [21][28], The bodies of reef fishes are often shaped differently from open water fishes. They first appeared about 245 million years ago and disappeared about 90 million years ago. This page is still a work-in-progress, but feel free to contribute. Ray-finned fishes form a class of bony fishes called Actinopterygii. We illuminate our fascinating world, and make your everyday more interesting. 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