Taxonomy
Originally, cane toads were used to eradicate pests from sugar cane, giving rise to their common name. The cane toad has many other common names, including "giant toad" and "marine toad"; the former refers to its size and the latter to the binomial name, Bufo marinus. It was one of many species described by Linnaeus in his 18th-century work Systema Naturae (1735). Linnaeus based the specific epithet marinus on an illustration by Dutch zoologist Albertus Seba, who mistakenly believed the cane toad to inhabit both terrestrial and marine environments. Other common names include "giant neotropical toad", "Dominican toad", "giant marine toad", and "South American Cane Toad". In Trinidadian English, they are commonly called crapaud, the French word for toad.
The subgenus Rhinella is increasingly considered to constitute a distinct genus of its own, thus changing the scientific name of the cane toad. In this case the specific name marinus changes to marina in order to conform with the rules of gender agreement as set out by the International Code of Zoological Nomenclature changing the binomial name from Bufo marinus to Rhinella marina; the binomial Rhinella marinus was subsequently introduced as a synonym through misspelling by Pramuk, Robertson, Sites, and Noonan (2008). Though controversial (with many traditional herpetologists still using Bufo marinus) the binomial Rhinella marina is gaining in acceptance with such bodies as the IUCN, Encyclopaedia of Life, Amphibian Species of the World and increasing numbers of scientific publications adopting its usage.
In Australia, the adults may be confused with large native frogs from the genera Limnodynastes, Cyclorana and Mixophyes. These species can be distinguished from the cane toad by the absence of large parotoid glands behind their eyes and the lack of a ridge between the nostril and the eye. Cane toads have been confused with the giant burrowing frog (Heleioporus australiacus), because both are large and warty in appearance; however, the latter can be readily distinguished from the former by its vertical pupils and its silver-grey (as opposed to gold) iris. Juvenile cane toads may be confused with species of the Uperoleia genus, but their adult colleagues can be distinguished by the lack of bright colouring on the groin and thighs.
In the United States, the cane toad closely resembles many bufonid species. In particular, it could be confused with the southern toad (Bufo terrestris), which can be distinguished by the presence of two bulbs in front of the parotoid glands.
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