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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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