New gliding mammaliaforms from the Jurassic

Qing-Jin Meng, David M. Grossnickle, Di Liu, Yu-Guang Zhang, April I. Neander, Qiang Ji and Zhe-Xi Luo ()
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Qing-Jin Meng: Beijing Museum of Natural History
David M. Grossnickle: Committee on Evolutionary Biology, The University of Chicago
Di Liu: Beijing Museum of Natural History
Yu-Guang Zhang: Beijing Museum of Natural History
April I. Neander: The University of Chicago
Qiang Ji: Hebei GEO University
Zhe-Xi Luo: Committee on Evolutionary Biology, The University of Chicago

Nature, 2017, vol. 548, issue 7667, 291-296

Abstract: Abstract Stem mammaliaforms are Mesozoic forerunners to mammals, and they offer critical evidence for the anatomical evolution and ecological diversification during the earliest mammalian history. Two new eleutherodonts from the Late Jurassic period have skin membranes and skeletal features that are adapted for gliding. Characteristics of their digits provide evidence of roosting behaviour, as in dermopterans and bats, and their feet have a calcaneal calcar to support the uropagatium as in bats. The new volant taxa are phylogenetically nested with arboreal eleutherodonts. Together, they show an evolutionary experimentation similar to the iterative evolutions of gliders within arboreal groups of marsupial and placental mammals. However, gliding eleutherodonts possess rigid interclavicle–clavicle structures, convergent to the avian furculum, and they retain shoulder girdle plesiomorphies of mammaliaforms and monotremes. Forelimb mobility required by gliding occurs at the acromion–clavicle and glenohumeral joints, is different from and convergent to the shoulder mobility at the pivotal clavicle–sternal joint in marsupial and placental gliders.

Date: 2017
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DOI: 10.1038/nature23476

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