tadpole

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tadpole,

larval, aquatic stage of any of the amphibianamphibian,
in zoology, cold-blooded vertebrate animal of the class Amphibia. There are three living orders of amphibians: the frogs and toads (order Anura, or Salientia), the salamanders and newts (order Urodela, or Caudata), and the caecilians, or limbless amphibians (order
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 animals. After hatching from the egg, the tadpole, sometimes called a polliwog, is gill-breathing and legless and propels itself by means of a tail. During the period of metamorphosismetamorphosis
[Gr.,=transformation], in zoology, term used to describe a form of development from egg to adult in which there is a series of distinct stages. Many insects, amphibians, mollusks, crustaceans, and fishes undergo metamorphosis, which may involve a change in habitat,
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 it develops the lungs, legs, and other organs of the adult and, in the frog and the toad, loses the tail.

Tadpole

 

the larva of tailless amphibians. Developing from eggs, tadpoles live an aquatic life. They have external gills, a two-chambered heart, a long tail that serves for movement, an adhering organ used for attachment to underwater objects, and lateral line organs: there are no extremities. Tadpoles feed chiefly on plants.

After three or four months of development, metamorphosis takes place. The heart becomes three-chambered, breathing by means of lungs develops, a second circulatory system (respiratory circulation) develops, the gills and gill chamber become reduced, the tail disappears, and the hind legs grow greatly, becoming the basic organs for movement. The horny beak drops off, the mouth enlarges, and the intestine shortens. The sense organs also change. The middle ear chamber develops along with the drum, and the eyes acquire movable lids. The lateral line organs disappear. When these changes are completed, a small frog comes onto dry land with the fully developed extremities of a terrestrial vertebrate.

tadpole

[′tad‚pōl]
(vertebrate zoology)
The larva of a frog or toad; at hatching it has a rounded body with a long fin-bordered tail, and the gills are external but shortly become enclosed.

tadpole

the aquatic larva of frogs, toads, etc., which develops from a limbless tailed form with external gills into a form with internal gills, limbs, and a reduced tail
References in periodicals archive ?
I use the term 'predation' throughout to include not only consumption of whole tadpoles but also injuries--fatal or non-fatal--caused by fish attacks.
To the best of our knowledge, the occurrence of tadpoles in November and an inferred breeding date in mid-September are the latest observations of breeding activity reported for B.
For experimental trials, 2 species of fish (29 Nile tilapia [Oreochromis niloticus] and 36 fathead minnows [Pimephalis promelas]) and 2 species of tadpoles (20 Fowler's toads [Bufo fowleri] and 10 green frogs [Lithobates (Rana) clamitans]) were used.
Analyzing tadpole frenzies in the lab, Summers' then-student Miho Yoshioka found that tadpoles on short rations begged more as hungry weeks dragged on.
The consequences are that early developed tadpoles are better candidates to achieve higher growth rates than lately developed ones (Browne et al.
We obtained previously undescribed tadpoles from various locations in the Mexican states of Hidalgo, Puebla, and Veracruz between March and June 2004 (see Comparative Materials).
9 February 2015 - US-based educational company Teaching Strategies has acquired US-based child management solutions provider Tadpoles, the company said on Monday.
Now thanks to their efforts - and the heavy weekend rain - the tadpoles are thriving in their new home.
Since snails and tadpoles may compete over a common algal resource, factors that influence primary productivity in aquatic ecosystems might also influence the interactions between snails and tadpoles.
For the study, first they hindered polyamine synthesis altogether and found that not only did the protection against seizures disappear, but it also left the tadpoles even more vulnerable to seizures.
Centrolenid tadpoles live in well-oxygenated rivers and streams, but they are described as lotic fossorial burrowers that live especially between the wet leaves and mud at the edges of streams (Villa & Valerio 1982, McDiarmid & Altig 1999, Savage 2002, Kubicki 2007).