Abstract
Marsupials represent a major mammalian diversification today restricted geographically to the Americas (but chiefly to the Neotropical Region) and Australasia. The group is highly diverse in morphology, ecology, and habits, and this is reflected to a great extent in cranial morphology. Here, we selected the largest specimens available from a post-weaning developmental series of a large-scale ongoing ontogenetic study to generate a linear multivariate morphospace of the skull of living marsupials. This sample comprised 106 species covering most living clades, and we used a basic set of measurements that estimate dimensions of major skull structures. We specified some predictions suited for a diverse but ancient group with an allopatric distribution. The cranial morphospace of living marsupials was low-dimensional, dominated by size/allometric as well as shape trends of robustness versus gracility and elongation versus depth. Phylogenetic structuring was present, especially in relation to diprotodontians, and the ecological imprint of patterns in phylomorphospace was marked. Evolutionary convergence was statistically detectable between selected species clusters combining Neotropical and Australasian species, chiefly among animalivorous forms but also in predominantly phytophagous arboreal possums and woolly opossums. Convergence among Australian large grazers may be influenced or limited by interspecific competition. Evolutionary divergence was remarkable in some groups, but evolutionary rates varied greatly across divergent forms. Some space voids may be due to extinction; fossil forms are expected to fill in these voids, expand the realized morphospace, and perhaps increase intra- and intercontinental convergence.
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Acknowledgements
We dedicate this paper to John R. Wible, master anatomist of living and fossil mammals, evolutionary biologist, and the best teacher of mammalian morphology. We thank the curators who allowed the examination of material under their care: Sergio Lucero of the Museo Argentino de Ciencias Naturales (Buenos Aires); Bruce Patterson and Bill Stanley of the Field Museum of Natural History (Chicago); Kris Helgen, Darrin Lunde, and Linda Gordon of the Smithsonian Institution (Washington, D.C.); Rob Voss and Eileen Westwig of the American Museum of Natural History (New York); Paula Jenkins of the British Natural History Museum (London); Sandy Ingleby of the Australian Museum (Sydney); Kenny Travouillon of the Western Australian Museum (Perth); Joao Alves de Oliveira of the Museu Nacional, Universidade Federal do Rio de Janeiro (Rio de Janeiro); and Mario de Vivo of the Museu do Zoologia Universidad do São Paulo (São Paulo). Justin Adams (Monash University) helped with important specimens. This work was supported by the Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) of Argentina; Agencia Nacional de Promoción Científica y Tecnológica, Argentina (ANPCyT), Argentina, funding of PICT 2015-2389 (to NPG, DAF and NFA), PICT 2016-3682 (to NPG), and PICT 2018-1237 (to MMM); Fundación Miguel Lillo, Argentina, project Z-0082-13 (to DAF); and Australian Research Council DE150100862 and FT200100822 (to LABW).
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Giannini, N.P., Morales, M.M., Wilson, L.A.B. et al. The Cranial Morphospace of Extant Marsupials. J Mammal Evol 28, 1145–1160 (2021). https://doi.org/10.1007/s10914-021-09589-y
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DOI: https://doi.org/10.1007/s10914-021-09589-y