[dinosaur] Mirusavis, new enantiornithine bird from Early Cretaceous of China (free pdf)

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Ben [email protected]=0A=0AA new paper not yet mentioned:=0A=
=0AFree pdf:=0A=0AMirusavis parvus, gen. et. sp. nov.=0A=0AMin Wang, Jingma=
i K O=E2=80=99Connor, Alida M Bailleul & Zhiheng Li (2019)=0AEvolution and =
distribution of medullary bone: evidence from a new Early=0ACretaceous enan=
tiornithine bird.=0ANational Science Review, nwz214 (advance online publica=
tion)=0Adoi: https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__doi.org=
_10.1093_nsr_nwz214&d=3DDwIFaQ&c=3DclK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc=
_gI&r=3DRy_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=3DvUxvcECIP9guWh1spJM=
QwhGaNLEnAym9O5dQEB3P68s&s=3DbvISb_LV9xdZy7Rsx_IOm6vzo621JI2bsqr1XNzidMc&e=
=3D=20=0Ahttps://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__academic.ou=
p.com_nsr_advance-2Darticle_doi_10.1093_nsr_nwz214_5681418&d=3DDwIFaQ&c=3Dc=
lK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=3DRy_mO4IFaUmGof_Yl9MyZgecRCKH=
n5g4z1CYJgFW9SI&m=3DvUxvcECIP9guWh1spJMQwhGaNLEnAym9O5dQEB3P68s&s=3DMCC1UAz=
6IoU_aZgluFzU_rN6xNfOEeE6jVVa3MI4Tjc&e=3D=20=0A=0A=0A=0ALiving birds are un=
ique among vertebrates in the formation of a=0Afemale-specific bone tissue =
called medullary bone (MB) that is strictly=0Aassociated with reproductive =
activity. MB is a rapidly mobilized source of=0Acalcium and phosphorus for =
the production of eggshell. Among living taxa,=0Aits skeletal distribution =
can be highly extensive such that it even exists=0Ain the ribs of some spec=
ies. Due to its ephemeral nature MB is rarely=0Afossilized, little is under=
stood with regards to the origin of MB and its=0Askeletal distribution in e=
arly taxa. Here we describe a new Early=0ACretaceous enantiornithine bird, =
Mirusavis parvus, gen. et. sp. nov.,=0Aindicating that skeleton-wide distri=
bution of MB appeared early in avian=0Aevolution. We suggest that this repr=
esents the plesiomorphic condition for=0Athe Aves, and that the distributio=
n of MB observed among extant=0Aneornithines is a product of increased pneu=
matization in this lineage and=0Anatural selection for more efficient distr=
ibution of MB.=0A=0A=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=0A=

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<div dir=3D"ltr"><div><br></div>Ben Creisler<div><a href=3D"mailto:bcreisle=
[email protected]">[email protected]</a></div><div><br></div><div>A new paper n=
ot yet mentioned:<br><div><br></div><div>Free pdf:</div><div><br></div><div=
>Mirusavis parvus, gen. et. sp. nov. <br><br>Min Wang, Jingmai K O=E2=80=99=
Connor, Alida M Bailleul &amp; Zhiheng Li (2019)<br>Evolution and distribut=
ion of medullary bone: evidence from a new Early Cretaceous enantiornithine=
 bird.<br>National Science Review, nwz214 (advance online publication)<br>d=
oi: <a href=3D"https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__doi.o=
rg_10.1093_nsr_nwz214&amp;d=3DDwMFaQ&amp;c=3DclK7kQUTWtAVEOVIgvi0NU5BOUHhpN=
0H8p7CSfnc_gI&amp;r=3DRy_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&amp;m=3Dv=
UxvcECIP9guWh1spJMQwhGaNLEnAym9O5dQEB3P68s&amp;s=3DbvISb_LV9xdZy7Rsx_IOm6vz=
o621JI2bsqr1XNzidMc&amp;e=3D">https://doi.org/10.1093/nsr/nwz214</a><br><a =
href=3D"https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__academic.oup=
.com_nsr_advance-2Darticle_doi_10.1093_nsr_nwz214_5681418&amp;d=3DDwMFaQ&am=
p;c=3DclK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&amp;r=3DRy_mO4IFaUmGof_Yl=
9MyZgecRCKHn5g4z1CYJgFW9SI&amp;m=3DvUxvcECIP9guWh1spJMQwhGaNLEnAym9O5dQEB3P=
68s&amp;s=3DMCC1UAz6IoU_aZgluFzU_rN6xNfOEeE6jVVa3MI4Tjc&amp;e=3D">https://a=
cademic.oup.com/nsr/advance-article/doi/10.1093/nsr/nwz214/5681418</a></div=
><div><br></div><div><br><br>Living birds are unique among vertebrates in t=
he formation of a female-specific bone tissue called medullary bone (MB) th=
at is strictly associated with reproductive activity. MB is a rapidly mobil=
ized source of calcium and phosphorus for the production of eggshell. Among=
 living taxa, its skeletal distribution can be highly extensive such that i=
t even exists in the ribs of some species. Due to its ephemeral nature MB i=
s rarely fossilized, little is understood with regards to the origin of MB =
and its skeletal distribution in early taxa. Here we describe a new Early C=
retaceous enantiornithine bird, Mirusavis parvus, gen. et. sp. nov., indica=
ting that skeleton-wide distribution of MB appeared early in avian evolutio=
n. We suggest that this represents the plesiomorphic condition for the Aves=
, and that the distribution of MB observed among extant neornithines is a p=
roduct of increased pneumatization in this lineage and natural selection fo=
r more efficient distribution of MB.</div><div><br>=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D<br></div></div></div>=0A=

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