Search results
Results from the WOW.Com Content Network
External gills are the gills of an animal, most typically an amphibian, that are exposed to the environment, rather than set inside the pharynx and covered by gill slits, as they are in most fishes. Instead, the respiratory organs are set on a frill of stalks protruding from the sides of an animal's head. The axolotl has three pairs of external ...
Gills or gill-like organs, located in different parts of the body, are found in various groups of aquatic animals, including mollusks, crustaceans, insects, fish, and amphibians. Semiterrestrial marine animals such as crabs and mudskippers have gill chambers in which they store water, enabling them to use the dissolved oxygen when they are on land.
The external gill rami are lined with filaments (fimbriae) to increase surface area for gas exchange. [15] Four-gill slits lined with gill rakers are hidden underneath the external gills, which prevent food from entering and allow particles to filter through. Axolotls have barely visible vestigial teeth, which
A signature feature of the axolotls’ forever-young look is their frilled external gills, which help them breathe in their watery home — the only spot they’re found in the wild: Lake ...
Juvenile bichirs have external gills, a very primitive feature that they share with larval amphibians. Previously, the evolution of gills was thought to have occurred through two diverging lines: gills formed from the endoderm, as seen in jawless fish species, or those form by the ectoderm, as seen in jawed fish.
Their external gills resemble ostrich plumes and their size depends on the oxygen levels present in the water. In stagnant water, mudpuppies have larger gills, whereas in running streams where oxygen is more prevalent, they have smaller gills. [4] The distal portions of the gills are very filamentous and contain many capillaries. [7]
The animal measured roughly 1.6 inches (4 centimeters) long on average and had a flattened, sinuous body and a tiny head, tipped with two tentacles and fringed with external gills. These were ...
The external gills will eventually be hidden by a layer of skin. Tadpoles of frogs and toads are usually globular, with a laterally compressed tail with which they swim by lateral undulation . When first hatched, anuran tadpoles have external gills that are eventually covered by skin, forming an opercular chamber with internal gills vented by ...