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RE: [dinosaur] New microraptorine dromaeosaurid specimen from Jehol Group in China (free pdf)
I'd say it's just Microraptor zhaoianus. It has the Microraptor autapomorphies
of posterior dentary teeth with constricted bases, a slender ischial shaft, and
highly elongate leg remiges, and lacks Sinornithosaurus' mesiolingual
premaxillary tooth grooves. The dental differences from some Microraptor
specimens (only 16 dentary teeth; posterior teeth serrated mesially; evenly
distributed teeth) are also seen in e.g. Microraptor specimen NGMC 00-12-A (Ji,
2002). And lest you suggest NGMC 00-12-A and this new IVPP V13476 are a new
intermediate species, note that each lacks the other's unique characters (short
pedal phalanx III-2 and long pubis in the former, and angled obturator process
and iliopubic fusion in the latter). All the non-dental characters besides the
obturator angle are said to be like Microraptor instead of Sinornithosaurus.
So unless we make every specimen a new species based on their few odd
characters, we have a species that exhibits individual variation like any other.
Mickey Mortimer
________________________________
> Date: Tue, 31 May 2016 15:01:19 -0700
> From: bcreisler@gmail.com
> To: dinosaur-l@usc.edu
> Subject: [dinosaur] New microraptorine dromaeosaurid specimen from
> Jehol Group in China (free pdf)
>
>
> Ben Creisler
> bcreisler@gmail.com<mailto:bcreisler@gmail.com>
>
>
> A new paper with free pdf:
>
> XU Xing & LI Feng (2016)
> A new microraptorine specimen (Theropoda: Dromaeosauridae) with a brief
> comment on the evolution of compound bones in theropods.
> Vertebrata PalAsiatica (advance online publication)
> https://urldefense.proofpoint.com/v2/url?u=http-3A__www.ivpp.ac.cn_cbw_gjzdwxb_pressonline_201605_t20160531-5F4613849.html&d=DQIGaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=kdJAU8MWByRpZDGH53HxNcU-XKE0BQ7VfQQkwdfazGE&s=DjPEfNcJnhTHnnXv1EhJBzZ0KZlm_aM1VughIhc4R_w&e=
>
> <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.ivpp.ac.cn_cbw_gjzdwxb_pressonline_201605_t20160531-5F4613849.html&d=DQMFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=GZWxWmrgackcmoI2GI86r7WyS4hMMbJS6ClHpcjUUf0&s=hG6aaIcLudSDXgY0MNFedbZEk0XvpkXZFEQV3KYIkHg&e=>
>
> https://urldefense.proofpoint.com/v2/url?u=http-3A__www.ivpp.ac.cn_cbw_gjzdwxb_pressonline_201605_P020160531566751886544.pdf&d=DQIGaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=kdJAU8MWByRpZDGH53HxNcU-XKE0BQ7VfQQkwdfazGE&s=CEhYtUoPXdA8wKFViVQGFzXUtPhPOv-6-ZXFbqmuJbw&e=
>
> <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.ivpp.ac.cn_cbw_gjzdwxb_pressonline_201605_P020160531566751886544.pdf&d=DQMFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=GZWxWmrgackcmoI2GI86r7WyS4hMMbJS6ClHpcjUUf0&s=hZUHPXPJIhkPCfTJXRJ6vbXy1lW4VzWEiAt9EDbtvaA&e=>
>
>
>
>
> Microraptorinae is a recently discovered subgroup of dromaeosaurid
> theropods, mostly comprising species from the Lower Cretaceous Jehol
> Group of western Liaoning, China. Here we describe a new microraptorine
> specimen from the Jiufotang Formation (the upper section of the Jehol
> Group) of Dapingfang, Chaoyang, Liaoning, which displays interesting
> morphological features not previously documented within
> Microraptorinae. Noteworthy are several osteological features,
> including dental and ischial ones, which are transitional between the
> condition of Sinornithosaurus and that of Microraptor. These features
> highlight the existence of a spectrum of morphological variation
> between Sinornithosaurus, which is more like a typical dromaeosaurid,
> and Microraptor, which shares many characteristics with troodontids.
> However, the taxonomic significance of these variations has not to be
> fully assessed yet. A feature deserving special mention is the fusion
> of the pubes to the ilia in this specimen, which has implications for
> the evolution of compound bones in theropods+. Our preliminary analysis
> suggests that many compound bones in birds have been formed by
> sequential fusion of multiple elements in a peramorphic process.
>
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