Abstract:Viviparous gastropods keep embryos within their genital tract, hidden as the whole soft body, within a parental shell. Consequently, during birth, shelled offspring pass through the aperture of the parental shell, which results in a trade-off between the dimensions of the aperture and the embryo size. The mechanical obstacles involved in this process mirror the selection of obstetrics experienced by humans, as well as the pelvic constraints recorded in other tetrapods. The repeated evolution of viviparity in C… Show more
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