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Gosner stage is a generalized system of describing stages of embryonal and larval development in anurans (frogs and toads). The Gosner system includes 46 numbered stages, from fertilized embryo (stage 1) to the completion of metamorphosis (stage 46). It was introduced by Kenneth Gosner in 1960. [2]
The oldest fossil "proto-frog" Triadobatrachus is known from the Early Triassic of Madagascar (250 million years ago), but molecular clock dating suggests their split from other amphibians may extend further back to the Permian, 265 million years ago. Frogs are widely distributed, ranging from the tropics to subarctic regions, but the greatest ...
Several of the genera within the Leptodactylidae lay their eggs in foam nests. These can be in crevices, on the surface of water, or on forest floors. These foam nests are some of the most varied among frogs. When eggs hatch in nests on the forest floor, the tadpoles remain within the nest, without eating, until metamorphosis.
Male Rana temporaria calling in a garden pond in Jambes, Belgium. The common frog or grass frog (Rana temporaria), also known as the European common frog, European common brown frog, European grass frog, European Holarctic true frog, European pond frog or European brown frog, is a semi-aquatic amphibian of the family Ranidae, found throughout much of Europe as far north as Scandinavia and as ...
Hochstetter's frogs can live to 30 years old. Adults do not breed until they are three years old, laying up to 20 eggs each season. [ 9 ] While all four species develop as tadpoles inside the egg, hatching as froglets with developed back legs, Hochstetter's frogs, as the only semiaquatic species, continue to develop in water while the three ...
Hylidae is a wide-ranging family of frogs commonly referred to as "tree frogs and their allies". However, the hylids include a diversity of frog species, many of which do not live in trees, but are terrestrial or semiaquatic.
Brachycephaloidea (Terrarana) is a monophyletic group of frogs that includes the families: Brachycephalidae, Caligophrynidae, Craugastoridae, Eleutherodactylidae, Ceuthomantidae, Neblinaphrynidae and Strabomantidae. [1] The superfamily contains 882 species that inhabit the New World tropics, subtropics, and Andean regions.
The marsupial frogs are a disputed family (Amphignathodontidae) in the order Anura. [1] When treated as a separate family, it consists of two genera, Gastrotheca and Flectonotus. [2] The frogs are native to Neotropical America (Central and South America). Under the dominant view, they are treated as part of the family of Hemiphractidae. [1] [3] [4]