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A tadpole or polliwog (also spelled pollywog) is the larval stage in the biological life cycle of an amphibian. Most tadpoles are fully aquatic, though some species of amphibians have tadpoles that are terrestrial. Tadpoles have some fish-like features that may not be found in adult amphibians, such as a lateral line, gills and swimming tails.
Tadpoles require cool streams with smooth-surfaced stones with a minimum diameter of 55 mm (2.2 in). Tadpoles probably spend most of their time attached to such substrates by a large oral sucker . The large, sucker-like mouth parts of the tadpoles are a second distinctive feature of the species, enabling survival in turbulent water unsuitable ...
In typical early tetrapod posture, the upper arm and upper leg extended nearly straight horizontal from its body, and the forearm and the lower leg extended downward from the upper segment at a near right angle. The body weight was not centered over the limbs, but was rather transferred 90 degrees outward and down through the lower limbs, which ...
The evolution of tetrapods began about 400 million years ago in the Devonian Period with the earliest tetrapods evolved from lobe-finned fishes. [1] Tetrapods (under the apomorphy-based definition used on this page) are categorized as animals in the biological superclass Tetrapoda, which includes all living and extinct amphibians, reptiles, birds, and mammals.
The eggs will then be washed into the stream or pond after the first rain and hatch into tadpoles. The tadpoles take around 12 months to develop into frogs. [2] The great barred frog is almost always found near running water. Its powerful legs, and webbed feet allow it to escape predation by hopping large distances into water and quickly ...
The juvenile may be a tadpole for 3 to 4 years before undergoing metamorphosis. [8] However, this rate heavily varies depending on the temperature and elevation of the area. [7] There are two classes of tadpoles: first year tadpoles and second year tadpoles. Metamorphosis tends to happen the second summer of tadpole life.
The four-eyed creatures found in Antarctica have “powerful” and “large ... The collected specimen had a body length of only about 0.4 inches, but its walking legs measured nearly 1.2 inches ...
[4] [7] Males call from rock walls or the surface of temporary pools and it is in these that the eggs are laid, which already hatch into tadpoles after about three days. [4] The tadpoles have a stout oval body with flattened underside. They appear black in the daytime but turn brownish-grey at night.