The type species, Grabauornis lingyuanensis, was named and described in 2014 by Johan Dalsätt, Per Ericson and Zhou Zhonghe. The genus name combines a reference to Amadeus William Grabau with the Greek word ὄρνις, which means bird. The specific name refers to the place where it was found; the city of Lingyuan in the Lianoning province of China. Dalsät already referred to the descriptive article in 2012, before it was published, in his dissertation and the name Grabauornis was mentioned with it. However it was still an invalid nomen ex dissertatione. In addition, he explicitly stated that he did not want to perform naming acts, if they are not performed validly.
The fossil, holotypeIVPP V14595, was found in a layer of the Yixian Formation which dates to the Aptian, at an age of 125 million years. The holotype consists of a well-preserved skeleton, compressed onto a single plate.
Grabauornis shows a unique combination of differentiating traits. The center of the back of the sternum plate extends further back than the side wings, the latter are fan-shaped. It also has a relatively short head with small, conical teeth. As for the arms and hands; the second and third phalanges of the second finger are quite robust, the third metacarpal extends further than the second and the hand is shorter than the ulna. Besides that, the shoulder blade is long and narrow and tapers towards the top.[3]
Grabauornis has a humerus that is 95% of the length of the ulna. In most enantiornitheans the values are between 77 and 125%, so Grabauornis has an average ratio. According to the descriptors, this indicates a good ability to fly; only above 130% the animal would have to remain on the ground. This ability would be confirmed by the possession of an alula, a thumb feather that could serve as a nose vane. The hypocleidium of the wishbone is also well developed.[3]
Referencesedit
^Dalsätt, J.; Ericson, P. G. P.; Zhou, Z. (2014). "A new Enantiornithes from the Early Cretaceous of China". Acta Geologica Sinica. 88 (4): 1034–1040. doi:10.1111/1755-6724.12270. S2CID 131170912.
^"Grabauornis lingyuanensis". The Paleobiology Database.
^ abDalsätt, Johan; Ericson, Per G. P.; Zhou, Zhonge (2014). "A New Enantiornithes (Aves) from the Early Cretaceous of China". Acta Geologica Sinica - English Edition. 88 (4): 1034–1040. doi:10.1111/1755-6724.12270. ISSN 1755-6724. S2CID 131170912.
Further readingedit
John Dalsätt, 2012, Fossil birds: Contributions to the understanding of avian evolution, MEDDELANDEN från STOCKHOLMS UNIVERSITETS INSTITUTION för GEOLOGISKA VETENSKAPER No. 349
This theropod-related article is a stub. You can help Wikipedia by expanding it.
grabauornis, extinct, genus, enantiornitheans, from, early, cretaceous, china, temporal, range, aptian, preꞒ, scientific, classification, domain, eukaryota, kingdom, animalia, phylum, chordata, clade, dinosauria, clade, saurischia, clade, theropoda, clade, avi. Grabauornis is an extinct genus of enantiornitheans from the Early Cretaceous of China 1 2 GrabauornisTemporal range Aptian 125 Ma PreꞒ Ꞓ O S D C P T J K Pg N Scientific classification Domain Eukaryota Kingdom Animalia Phylum Chordata Clade Dinosauria Clade Saurischia Clade Theropoda Clade Avialae Clade Enantiornithes Clade Euenantiornithes Genus GrabauornisDalsatt et al 2014 Species G lingyuanensis Binomial name Grabauornis lingyuanensisDalsatt et al 2014 The type species Grabauornis lingyuanensis was named and described in 2014 by Johan Dalsatt Per Ericson and Zhou Zhonghe The genus name combines a reference to Amadeus William Grabau with the Greek word ὄrnis which means bird The specific name refers to the place where it was found the city of Lingyuan in the Lianoning province of China Dalsat already referred to the descriptive article in 2012 before it was published in his dissertation and the name Grabauornis was mentioned with it However it was still an invalid nomen ex dissertatione In addition he explicitly stated that he did not want to perform naming acts if they are not performed validly The fossil holotype IVPP V14595 was found in a layer of the Yixian Formation which dates to the Aptian at an age of 125 million years The holotype consists of a well preserved skeleton compressed onto a single plate Grabauornis shows a unique combination of differentiating traits The center of the back of the sternum plate extends further back than the side wings the latter are fan shaped It also has a relatively short head with small conical teeth As for the arms and hands the second and third phalanges of the second finger are quite robust the third metacarpal extends further than the second and the hand is shorter than the ulna Besides that the shoulder blade is long and narrow and tapers towards the top 3 Grabauornis has a humerus that is 95 of the length of the ulna In most enantiornitheans the values are between 77 and 125 so Grabauornis has an average ratio According to the descriptors this indicates a good ability to fly only above 130 the animal would have to remain on the ground This ability would be confirmed by the possession of an alula a thumb feather that could serve as a nose vane The hypocleidium of the wishbone is also well developed 3 References edit Dalsatt J Ericson P G P Zhou Z 2014 A new Enantiornithes from the Early Cretaceous of China Acta Geologica Sinica 88 4 1034 1040 doi 10 1111 1755 6724 12270 S2CID 131170912 Grabauornis lingyuanensis The Paleobiology Database a b Dalsatt Johan Ericson Per G P Zhou Zhonge 2014 A New Enantiornithes Aves from the Early Cretaceous of China Acta Geologica Sinica English Edition 88 4 1034 1040 doi 10 1111 1755 6724 12270 ISSN 1755 6724 S2CID 131170912 Further reading editJohn Dalsatt 2012 Fossil birds Contributions to the understanding of avian evolution MEDDELANDEN fran STOCKHOLMS UNIVERSITETS INSTITUTION for GEOLOGISKA VETENSKAPER No 349 nbsp This theropod related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Grabauornis amp oldid 1223840456, wikipedia, wiki, book, books, library,
