The original selective benefits provided by the jaw were probably not related to feeding, but were related to improved respiratory efficiency. The jaw was used with a buccal pump to pump water throughout the gills.
Why do some fish have teeth?
For example, most fish that eat other fish (carnivores) have teeth designed to sting, grab, and cut their prey, but most that eat plants (herbivores). Fish have teeth that are more suitable for shredding such things as algae. 27 мар. 2018
Why do fish have pharyngeal teeth?
In these fish, these teeth support the transport of food, which is the main function of the pharyngeal device achieved primarily by the anterior-posterior movement of the hypopharyngeal jaw. The prey is carried from the mouth to the esophagus with little change.
What is a toothed fish?
Sheepshead fish have been around for a long time and are commonly found in the Americas. A fisherman in North Carolina, USA, caught a fish with sharp teeth like a human. Images of aquatic animals shared on Facebook pages quickly became infected with the virus and surprised many.
Why did fish evolve their jaws?
The jaws allow vertebrates to utilize a wide range of foods and engage in predation and defense. Jawed vertebrates arose from jawless vertebrates equipped with a pharyngeal gill device consisting of gill rods and slits. The prosobranchia has evolved into a jaw that supports the structure of vertebrates.
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When did ostriches go extinct?Why do fish have pharyngeal teeth?
