[dinosaur] Nanotyrannus is juvenile Tyrannosaurus rex (free pdf)
Ben Creisler <[email protected]> Wed, 1 Jan 2020 11:22:08 -0800
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--000000000000e247ad059b18feb4 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: Quoted-printable Ben [email protected]=0A=0AA new paper in open access:=0A=0A= =0A=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=0A=0AHolly N. Woodward,= Katie Tremaine, Scott A. Williams, Lindsay E. Zanno,=0AJohn R. Horner and = Nathan Myhrvold (2020)=0AGrowing up Tyrannosaurus rex: Osteohistology refut= es the pygmy=0A=E2=80=9CNanotyrannus=E2=80=9D and supports ontogenetic nich= e partitioning in juvenile=0ATyrannosaurus.=0AScience Advances 6(1): eaax62= 50=0ADOI: 10.1126/sciadv.aax6250=0Ahttps://urldefense.proofpoint.com/v2/url= ?u=3Dhttps-3A__advances.sciencemag.org_content_6_1_eaax6250&d=3DDwIFaQ&c=3D= clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=3DRy_mO4IFaUmGof_Yl9MyZgecRCK= Hn5g4z1CYJgFW9SI&m=3DD5oeb0jisu29VIw5bI9c8mAED5xw8nHS65oMqTDkkho&s=3D2VmWEJ= nKXLIgw2xp7_AuAabOMR4WASwHJTFu5KSu5N8&e=3D=20=0A=0AFree pdf:=0Ahttps://urld= efense.proofpoint.com/v2/url?u=3Dhttps-3A__advances.sciencemag.org_content_= 6_1_eaax6250_tab-2Dpdf&d=3DDwIFaQ&c=3DclK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CS= fnc_gI&r=3DRy_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=3DD5oeb0jisu29VIw5= bI9c8mAED5xw8nHS65oMqTDkkho&s=3DiV4jYjQW6mbkc7mG04D76yP4ir-_82W4QQOBDfa8Oxw= &e=3D=20=0A=0A=0ADespite its iconic status as the king of dinosaurs, Tyrann= osaurus rex=0Abiology is incompletely understood. Here, we examine femur an= d tibia bone=0Amicrostructure from two half-grown T. rex specimens, permitt= ing the=0Aassessments of age, growth rate, and maturity necessary for inves= tigating=0Athe early life history of this giant theropod. Osteohistology re= veals these=0Awere immature individuals 13 to 15 years of age, exhibiting g= rowth rates=0Asimilar to extant birds and mammals, and that annual growth w= as dependent=0Aon resource abundance. Together, our results support the syn= onomization of=0A"Nanotyrannus" into Tyrannosaurus and fail to support the = hypothesized=0Apresence of a sympatric tyrannosaurid species of markedly sm= aller adult=0Abody size. Our independent data contribute to mounting eviden= ce for a rapid=0Ashift in body size associated with ontogenetic niche parti= tioning late in=0AT. rex ontogeny and suggest that this species singularly = exploited mid- to=0Alarge-sized theropod niches at the end of the Cretaceou= s.=0A=0A=0ANews:=0A=0Ahttps://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A= __www.eurekalert.org_pub-5Freleases_2020-2D01_aaft-2Dbas123019.php&d=3DDwIF= aQ&c=3DclK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=3DRy_mO4IFaUmGof_Yl9My= ZgecRCKHn5g4z1CYJgFW9SI&m=3DD5oeb0jisu29VIw5bI9c8mAED5xw8nHS65oMqTDkkho&s= =3DJU4swlwQJzfqoeleYTIFWHnjQrzHNKwrfO5GGgmHsG8&e=3D=20=0A=0Ahttps://urldefe= nse.proofpoint.com/v2/url?u=3Dhttps-3A__www.eurekalert.org_pub-5Freleases_2= 020-2D01_osuc-2Drlm122019.php&d=3DDwIFaQ&c=3DclK7kQUTWtAVEOVIgvi0NU5BOUHhpN= 0H8p7CSfnc_gI&r=3DRy_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=3DD5oeb0jis= u29VIw5bI9c8mAED5xw8nHS65oMqTDkkho&s=3DVzt5PVBF4KoqgMoctbAJn3E4fqlRi-of1Ika= k7ZbdmU&e=3D=20=0A=0Ahttps://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A_= _www.nationalgeographic.com_science_2020_01_nanotyrannus-2Dfossils-2Dreally= -2Dare-2Dteenage-2Dt-2Drex-2Ddinosaur-2Dgrowth-2Drates_&d=3DDwIFaQ&c=3DclK7= kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=3DRy_mO4IFaUmGof_Yl9MyZgecRCKHn5g= 4z1CYJgFW9SI&m=3DD5oeb0jisu29VIw5bI9c8mAED5xw8nHS65oMqTDkkho&s=3Diq7UbyB4L3= oKOieHhjZ7lVzImtexf6BApQJixCUAuSs&e=3D=20=0A=0A=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=0A= --000000000000e247ad059b18feb4 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: Quoted-printable <div dir=3D"ltr"><br><div>Ben Creisler</div><div><a href=3D"mailto:bcreisle= [email protected]">[email protected]</a></div><div><br></div><div>A new paper i= n open access:</div><div><br></div><div><br></div><div>=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D</div><div><br>Holly N. Woodward, Katie Trema= ine, Scott A. Williams, Lindsay E. Zanno, John R. Horner and Nathan Myhrvol= d (2020)<br>Growing up Tyrannosaurus rex: Osteohistology refutes the pygmy = =E2=80=9CNanotyrannus=E2=80=9D and supports ontogenetic niche partitioning = in juvenile Tyrannosaurus.<br>Science Advances 6(1): eaax6250<br>DOI: 10.11= 26/sciadv.aax6250<br><a href=3D"https://urldefense.proofpoint.com/v2/url?u= =3Dhttps-3A__advances.sciencemag.org_content_6_1_eaax6250&d=3DDwMFaQ&am= p;c=3DclK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=3DRy_mO4IFaUmGof_Yl= 9MyZgecRCKHn5g4z1CYJgFW9SI&m=3DD5oeb0jisu29VIw5bI9c8mAED5xw8nHS65oMqTDk= kho&s=3D2VmWEJnKXLIgw2xp7_AuAabOMR4WASwHJTFu5KSu5N8&e=3D">https://a= dvances.sciencemag.org/content/6/1/eaax6250</a></div><div><br>Free pdf:<br>= <a href=3D"https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__advances.= sciencemag.org_content_6_1_eaax6250_tab-2Dpdf&d=3DDwMFaQ&c=3DclK7kQ= UTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=3DRy_mO4IFaUmGof_Yl9MyZgecRCKHn= 5g4z1CYJgFW9SI&m=3DD5oeb0jisu29VIw5bI9c8mAED5xw8nHS65oMqTDkkho&s=3D= iV4jYjQW6mbkc7mG04D76yP4ir-_82W4QQOBDfa8Oxw&e=3D">https://advances.scie= ncemag.org/content/6/1/eaax6250/tab-pdf</a></div><div><br></div><div><br>De= spite its iconic status as the king of dinosaurs, Tyrannosaurus rex biology= is incompletely understood. Here, we examine femur and tibia bone microstr= ucture from two half-grown T. rex specimens, permitting the assessments of = age, growth rate, and maturity necessary for investigating the early life h= istory of this giant theropod. Osteohistology reveals these were immature i= ndividuals 13 to 15 years of age, exhibiting growth rates similar to extant= birds and mammals, and that annual growth was dependent on resource abunda= nce. Together, our results support the synonomization of "Nanotyrannus= " into Tyrannosaurus and fail to support the hypothesized presence of = a sympatric tyrannosaurid species of markedly smaller adult body size. Our = independent data contribute to mounting evidence for a rapid shift in body = size associated with ontogenetic niche partitioning late in T. rex ontogeny= and suggest that this species singularly exploited mid- to large-sized the= ropod niches at the end of the Cretaceous.</div><div><br></div><div><br></d= iv><div>News:<br><br><a href=3D"https://urldefense.proofpoint.com/v2/url?u= =3Dhttps-3A__www.eurekalert.org_pub-5Freleases_2020-2D01_aaft-2Dbas123019.p= hp&d=3DDwMFaQ&c=3DclK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r= =3DRy_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=3DD5oeb0jisu29VIw5bI9c= 8mAED5xw8nHS65oMqTDkkho&s=3DJU4swlwQJzfqoeleYTIFWHnjQrzHNKwrfO5GGgmHsG8= &e=3D">https://www.eurekalert.org/pub_releases/2020-01/aaft-bas123019.p= hp</a></div><div><br><a href=3D"https://urldefense.proofpoint.com/v2/url?u= =3Dhttps-3A__www.eurekalert.org_pub-5Freleases_2020-2D01_osuc-2Drlm122019.p= hp&d=3DDwMFaQ&c=3DclK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r= =3DRy_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=3DD5oeb0jisu29VIw5bI9c= 8mAED5xw8nHS65oMqTDkkho&s=3DVzt5PVBF4KoqgMoctbAJn3E4fqlRi-of1Ikak7ZbdmU= &e=3D">https://www.eurekalert.org/pub_releases/2020-01/osuc-rlm122019.p= hp</a></div><div><br></div><div><a href=3D"https://urldefense.proofpoint.co= m/v2/url?u=3Dhttps-3A__www.nationalgeographic.com_science_2020_01_nanotyran= nus-2Dfossils-2Dreally-2Dare-2Dteenage-2Dt-2Drex-2Ddinosaur-2Dgrowth-2Drate= s_&d=3DDwMFaQ&c=3DclK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r= =3DRy_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=3DD5oeb0jisu29VIw5bI9c= 8mAED5xw8nHS65oMqTDkkho&s=3Diq7UbyB4L3oKOieHhjZ7lVzImtexf6BApQJixCUAuSs= &e=3D">https://www.nationalgeographic.com/science/2020/01/nanotyrannus-= fossils-really-are-teenage-t-rex-dinosaur-growth-rates/</a><br></div><div><= br>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D<br></div></div>=0A= --000000000000e247ad059b18feb4--