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A bizarre theropod from the Early Cretaceous of Japan highlighting mosaic
evolution among coelurosaurians
#MMPMID26908367
Azuma Y
; Xu X
; Shibata M
; Kawabe S
; Miyata K
; Imai T
Sci Rep
2016[Feb]; 6
(?): 20478
PMID26908367
show ga
Our understanding of coelurosaurian evolution, particularly of bird origins, has
been greatly improved, mainly due to numerous recently discovered fossils
worldwide. Nearly all these discoveries are referable to the previously known
coelurosaurian subgroups. Here, we report a new theropod, Fukuivenator paradoxus,
gen. et sp. nov., based on a nearly complete specimen from the Lower Cretaceous
Kitadani Formation of the Tetori Group, Fukui, Japan. While Fukuivenator
possesses a large number of morphological features unknown in any other theropod,
it has a combination of primitive and derived features seen in different theropod
subgroups, notably dromaeosaurid dinosaurs. Computed-tomography data indicate
that Fukuivenator possesses inner ears whose morphology is intermediate between
those of birds and non-avian dinosaurs. Our phylogenetic analysis recovers
Fukuivenator as a basally branching maniraptoran theropod, yet is unable to refer
it to any known coelurosaurian subgroups. The discovery of Fukuivenator
considerably increases the morphological disparity of coelurosaurian dinosaurs
and highlights the high levels of homoplasy in coelurosaurian evolution.
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