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• W3211778901 abstract "The teeth of sharks famously form a series of transversely organized files with a conveyor-belt replacement that are borne directly on the jaw cartilages, in contrast to the dermal plate-borne dentition of bony fishes that undergoes site-specific replacement. A major obstacle in understanding how this system evolved is the poorly understood relationships of the earliest chondrichthyans and the profusion of morphologically and terminologically diverse bones, cartilages, splints and whorls that they possess. Here, we use tomographic methods to investigate mandibular structures in several early branching ‘acanthodian’-grade stem-chondrichthyans. We show that the dentigerous jaw bones of disparate genera of ischnacanthids are united by a common construction, being growing bones with non-shedding dentition. Mandibular splints, which support the ventro-lateral edge of the Meckel's cartilage in some taxa, are formed from dermal bone and may be an acanthodid synapomorphy. We demonstrate that the teeth of Acanthodopsis are borne directly on the mandibular cartilage and that this taxon is deeply nested within an edentulous radiation, representing an unexpected independent origin of teeth. Many or even all of the range of unusual oral structures may be apomorphic, but they should nonetheless be considered when building hypotheses of tooth and jaw evolution, both in chondrichthyans and more broadly." @default.
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• W3211778901 date "2021-11-01" @default.
• W3211778901 modified "2023-09-30" @default.
• W3211778901 title "Diverse stem-chondrichthyan oral structures and evidence for an independently acquired acanthodid dentition" @default.
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• W3211778901 doi "https://doi.org/10.1098/rsos.210822" @default.
• W3211778901 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/8580420" @default.
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