AI Article Synopsis
- A newly discovered Late Jurassic docodontan exhibits adaptations for a life underground, resembling the modern golden moles in reduced finger segments compared to ancestral mammalian patterns.
- The digit segment reduction in mammals often results from the fusion of bone precursors, a process linked to specific genes identified in mice and humans.
- The docodontan also displays a shift in its rib structure, influenced by developmental genes like Hox9 and Myf5, suggesting that these genetic mechanisms were present before the emergence of modern mammals, contributing to early mammalian diversity.
Article Abstract
A new Late Jurassic docodontan shows specializations for a subterranean lifestyle. It is similar to extant subterranean golden moles in having reduced digit segments as compared to the ancestral phalangeal pattern of mammaliaforms and extant mammals. The reduction of digit segments can occur in mammals by fusion of the proximal and intermediate phalangeal precursors, a developmental process for which a gene and signaling network have been characterized in mouse and human. Docodontans show a positional shift of thoracolumbar ribs, a developmental variation that is controlled by Hox9 and Myf5 genes in extant mammals. We argue that these morphogenetic mechanisms of modern mammals were operating before the rise of modern mammals, driving the morphological disparity in the earliest mammaliaform diversification.
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| http://dx.doi.org/10.1126/science.1260880 | DOI Listing |
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