Rana

Definition and stakes

1911 Encyclopædia Britannica (1911)

“ Frogs proper are typified by the common British species, Rana temporaria, and its allies, such as the edible frog, R. esculenta, and the American bull-frog R. catesbiana. The genus Rana may be defined as firmisternal Ecaudata with cylindrical transverse processes to the sacral vertebra, teeth in the upper jaw and on the vomer, a protrusible tongue which is free and forked behind, a horizontal pupil and more or less webbed toes. It includes about 200 species, distributed over the whole world with the exception of the greater part of South America and Australia. ”
Source: Wikisource

1911 Encyclopædia Britannica (1911)

“ In some species of Rana and Staurois inhabiting mountainous districts in south-eastern Asia, the larvae are adapted for life in torrents, being provided with a circular adhesive disk on the ventral surface behind the mouth, by means of which they are able to anchor themselves to stones. ”
Source: Wikisource

Portrait of Alfred Russel Wallace Alfred Russel Wallace,  The Geographical Distribution of Animals…

“ They are perhaps most abundant in South America, where a large number of the genera and species are found; the Ethiopian region comes next, while they are rather less abundant in the Oriental and Australian regions; the Nearctic region has much less (about 12 species) , while the Palæarctic has only five, and these two northern regions only possess the single genus Rana. The genera are distributed as follows:—
Rana (60 sp.) , ranges all over the world, except Australia and South America, although it extends into New Guinea and into Mexico and Central America; it is most abundant in Africa.
”
Source: Gutenberg

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