A suborder of frogs and toads with ribbed pelvic bones that form a connected arch, found in ancient amphibian lineages.
From Latin 'arcus' (arch) + 'ferre' (to carry), literally 'arch-bearing'; this taxonomic term describes the distinctive skeletal feature of this frog group's pelvic structure.
The name is a perfect anatomical description—these are ancient frogs whose pelvic bones form a connected arch that's completely different from modern frogs, showing us evolution happening in bone structure.
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