Heterochrony and developmental modularity of cranial osteogenesis in lipotyphlan mammalsReport as inadecuate

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, 2:21

First Online: 01 November 2011Received: 05 July 2011Accepted: 01 November 2011


BackgroundHere we provide the most comprehensive study to date on the cranial ossification sequence in Lipotyphla, the group which includes shrews, moles and hedgehogs. This unique group, which encapsulates diverse ecological modes, such as terrestrial, subterranean, and aquatic lifestyles, is used to examine the evolutionary lability of cranial osteogenesis and to investigate the modularity of development.

ResultsAn acceleration of developmental timing of the vomeronasal complex has occurred in the common ancestor of moles. However, ossification of the nasal bone has shifted late in the more terrestrial shrew mole. Among the lipotyphlans, sequence heterochrony shows no significant association with modules derived from developmental origins that is, neural crest cells vs. mesoderm derived parts or with those derived from ossification modes that is, dermal vs. endochondral ossification.

ConclusionsThe drastic acceleration of vomeronasal development in moles is most likely coupled with the increased importance of the rostrum for digging and its use as a specialized tactile surface, both fossorial adaptations. The late development of the nasal in shrew moles, a condition also displayed by hedgehogs and shrews, is suggested to be the result of an ecological reversal to terrestrial lifestyle and reduced functional importance of the rostrum. As an overall pattern in lipotyphlans, our results reject the hypothesis that ossification sequence heterochrony occurs in modular fashion when considering the developmental patterns of the skull. We suggest that shifts in the cranial ossification sequence are not evolutionarily constrained by developmental origins or mode of ossification.

Keywordsskull heterochrony Eulipotyphla embryology ossification integration phylogeny micro CT Electronic supplementary materialThe online version of this article doi:10.1186-2041-9139-2-21 contains supplementary material, which is available to authorized users.

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Author: Daisuke Koyabu - Hideki Endo - Christian Mitgutsch - Gen Suwa - Kenneth C Catania - Christoph PE Zollikofer - Sen-ichi Od

Source: https://link.springer.com/

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