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Download as PDF; Printable version; ... Pages in category "Frogs by classification" The following 6 pages are in this category, out of 6 total.
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 ...
Males are typically around 5 cm (2.0 in) long, while females are around 6–6.5 cm (2.4–2.6 in) long. These frogs are brown or green, with dark blotches along their backs, a pair of ridges running from each eye and a cream or yellow stripe down the middle of the frog's back. The vocal sacs on the male are cream or even white. [4]
Frost [3] restricted Rana to the Old World true frogs and the Eurasian brown and pond frogs of the common frog R. temporaria group, [4] although other authors disagreed with this arrangement. [ 5 ] [ 6 ] [ 2 ] [ 7 ] In 2016, a consortium of Rana researchers from throughout Europe, Asia, and North America revised the group, and reported that the ...
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 ...
[4] [5] The subgenus was subsequently expanded to seven species in Central and South America in a systematic revision of the genus Rana. [6] The name was previously used by Frost et al. as a separate genus of ranid frogs that included most of the North American frogs traditionally included in the genus Rana , [ 7 ] including the American ...
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Wood frogs range from 51 to 70 mm (2.0 to 2.8 in) in length. Females are larger than males. [5] [6] Adult wood frogs are usually brown, tan, or rust-colored, and usually have a dark eye mask. [7] Individual frogs are capable of varying their color; Conant (1958) depicts one individual which was light brown and dark brown at different times.
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