Systematic reinterpretation of Piksi barbarulna Varricchio, 2002 from the Two Medicine Formation (Upper Cretaceous) of Western USA (Montana) as a pterosaur rather than a bird

Geodiversitas

Federico L. Agnolin¹  David Varricchio¹ 

关键词: Pterosauria;    Late Cretaceous;    North America;    Pterosauria;    Crétacée supérieur;    Amérique du Nord;   

DOI  :  10.5252/g2012n4a10

学科分类：生物科学（综合）

来源: Museum National d Histoire Naturelle

【 摘 要 】

Varricchio(2002)describedsomeforelimbbonesfromtheLateCretaceous(Campanian)TwoMedicineFormation,GlacierCounty,Montana(USA),astheholotypeofPiksibarbarulna,asupposedornithothoracinebird.HoweverreevaluationofPiksiVarricchio,2002insteadrecognizesthisgenusasbelongingtoPterosauriaKaup,1834andnotAvesLinnaeus,1758.Piksiexhibitsthefollowingderivedhumeraltraitsofpterosaurs:1)verylargeectepicondyle;2)largetrochlea;3)withadeep,wideandpoorlydeliminatedbrachialdepressionthatisproximodistallyextended;4)awideanddeepolecranalfossanotmarkeddorsallybyaridge;and5)lackingadistaldepressionofthegrooveforthem.humerotricipitalis.Moreover,theputativeEarlyCretaceousbirdsEurolimnornisJurcsákamp;Kessler,1986andPalaeocursornisJurcsákamp;Kessler,1986,basedondistalhumeri,arealsoregardedaspterosaurs.TherecordofPiksiconstitutesanimportantadditiontotheLatestCretaceouspterosaurianrecord.

【 授权许可】

Unknown