Once formed, they create tiny openings to the outside known as spiracles. As the tadpole develops, internal gills appear below the initial external ones and are covered by a fold of tissue. Respiratory system: they have external gills for breathing.As usually occurs in vertebrates, the notochord is transitory (as we have commented) and gives rise to the vertebral column, also ossified into bone in frogs. Skeleton: is of a cartilaginous type, but these structures will also transform until bones are formed in adult individuals.Another tube located towards the end of the tail known as the ventral tube is used for excretion. This includes a digestive tube which starts at the mouth and connects to the intestine. Belly: tadpoles have a bulging belly which is part of their digestive system.Tadpoles are able to shed their tails in some circumstances, such as when attacked by predators. This occurs due to apoptosis, a type of programed cell death. The tissue of the tail is rigid, but it must be able to decompose during metamorphosis. It is an anatomical structure common to all chordates, giving rise to their nomenclature. Tail: a hardened muscular structure that covers the notochord, a cartilage-like structure which is important for sending signals during development.They do not have other limbs since they do not need them until after they undergo metamorphosis. If they resemble fish it is precisely because this body shape allows them to swim in water. For this reason, their head is differentiated head from an elongated body which ends in a tail. Tadpoles are exclusively aquatic in habit. Learn more with our article on what tadpoles eat. Larvae usually follow a herbivorous diet, but in certain circumstances they can be omnivorous, even eating other tadpoles. They may also have these structures in the lower jaw surrounded by a kind of horny beak, but this can vary between frog species. Mouth: they do not have true teeth, but tadpoles have similar structures made of keratin that are located in the upper jaw used for feeding.Although they lack eyelids, tadpoles have eyes which are located towards the front of the head. Head: as shown in the diagram below, you can see the head is significantly differentiated from the body.We now look at some of the most important internal and external anatomical features of tadpoles: Animals that go through metamorphosis change significantly from larval to adult stages. They lose these structures due to the process of metamorphosis. Tadpole shave other anatomical structures which allow them to survive in water including gills. Tadpoles have a tail which allows them to swim in water, an appendage which is not carried over into their adult stage. This occurs in a minority of frog species as most larval stages are tadpoles. a miniature version of their adult frog stage. This means they emerge from the egg as a froglet, i.e. Frogs that don't have a tadpole stage go through direct development. They all have a larval stage and require water to develop. While we rightly associate tadpoles with anurans, not all frog species have a tadpole stage. Frogs and toads are from the order Anura.
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