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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.
The behavior of an amphibian hatchling, commonly referred to as a tadpole, is controlled by a few thousand neurons. [4] 99% of a Xenopus hatchling's first day after hatching is spent hanging from a thread of mucus secreted from near its mouth will eventually form; if it becomes detached from this thread, it will swim back and become reattached, usually within ten seconds. [4]
The life cycle is short. The tadpole-shaped larva usually performs the tail shift less than one day after fecundation, becoming fully functional juveniles. Adults usually reproduce after 5 to 7 days depending on the species. [11] Fertilisation is external. The body wall ruptures during egg release, killing the animal. [30]
Frogs have a two-stage life cycle, with the aquatic tadpole larva metamorphosing into the adult form. This tadpole was in the late stages of metamorphosis. Adults of this species are a similar ...
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The adult frogs of P. paradoxa have a snout–to–vent length of 3.4–7.6 cm (1.3–3.0 in) and are green to brown coloured with dark green, olive or dark brownish stripes or mottling; the pattern and hue varies significantly. [4] [8] The female of P. paradoxa lay eggs among water plants; the eggs develop into tadpoles. They always reach a ...
Adults are roughly seven to eight centimetres long with dark warty backs, a prominent tibial gland, fleshy metatarsal tubercules and a smooth white or mottled belly. The tadpole stage is relatively long, lasting up to fifteen months.
The eggs are laid in temporary ponds that may quickly evaporate, so the tadpole stage is unusually brief, with rapid development to the adult form in as little as two weeks. To further speed their growth, some of the tadpoles are cannibalistic, eating their brood-mates to increase their supply of protein. [2]