Evolutionary BiologybioRxiv
Getting out of a mammalian egg: the egg tooth and caruncle of the echidna
J. C. Fenelon, A. Bennetts, N. Anthwal…·M. B. Renfree
The paper examines the development of the echidna's egg tooth and caruncle using micro-CT, histology, and immunofluorescence, revealing similarities between monotreme and reptilian teeth.