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The Gosner system includes 46 stages, from fertilized embryo (stage 1) to the completion of metamorphosis (stage 46). In the original publication, only two major developmental stages were distinguished, embryonic or prefeeding stages (1–25) and larval stages (26–46). [ 2 ]
Amphibians are ectothermic, anamniotic, four-limbed vertebrate animals that constitute the class Amphibia. In its broadest sense, it is a paraphyletic group encompassing all tetrapods excluding the amniotes (tetrapods with an amniotic membrane , such as modern reptiles , birds and mammals ).
Print/export Download as PDF; Printable version; ... (The largest species of salamanders do not go through a metamorphosis.) [38] Amphibians that lay eggs on land ...
Print/export Download as PDF; Printable version; ... (rather than first entering a feeding larval tadpole stage followed by metamorphosis, as amphibians do).
Most amphibians begin their lives as aquatic animals which are unable to live on dry land, often being dubbed as tadpoles. To reach adulthood , they go through a process called metamorphosis , in which they lose their gills and start living on land.
The young of some ovoviviparous amphibians, such as Limnonectes larvaepartus, are born as larvae, and undergo further metamorphosis outside the body of the mother. Members of genera Nectophrynoides and Eleutherodactylus bear froglets, not only the hatching, but all the most conspicuous metamorphosis , being completed inside the body of the ...
The largest living amphibian is the 1.8 m (5 ft 11 in) South China giant salamander (Andrias sligoi), but this is dwarfed by prehistoric temnospondyls such as Mastodonsaurus which could reach up to 6 m (20 ft) in length. The study of amphibians is called batrachology, while the study of both reptiles and amphibians is called herpetology.
Tadpoles can reach a length of 75-90 mm by metamorphosis. Tadpoles are pale brown or straw-colored initially, but gradually darken to a medium brown. Over time, the tadpoles develop black spots on their tails and bodies (Inger and Stuebing 1997), with a black spot always present at the junction of the trunk and tail.