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Postcranial anatomy of Tanius sinensis Wiman, 1929 (Dinosauria; Hadrosauroidea)
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
2015 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Postkraniala anatomin hos Tanius sinensis Wiman, 1929 (Dinosauria; Hadrosauroidea) (Swedish)
Abstract [en]

Tanius sinensis Wiman, 1929 was one of the first hadrosauroid or “duck-billed” taxa erected from China, indeed one of the very first non-avian dinosaur taxa to be erected based on material from the country. Since the original description by Wiman in 1929, the anatomy of T. sinensis has received relatively little attention in the literature since then. This is unfortunate given the importance of T. sinensis as a possible non-hadrosaurid hadrosauroid i.e. a member of Hadrosauroidea outside the family of Hadrosauridae, living in the Late Cretaceous, at a time when most non-hadrosaurid hadrosauroids had become replaced by the members of Hadrosauridae. To gain a better understanding of the anatomy of T. sinensis and its phylogenetic relationships, the postcranial anatomy of it is redescribed. T. sinensis is found to have a mosaic of basal traits like strongly opisthocoelous cervical vertebrae, the proximal end of scapula being dorsoventrally wider than the distal end, the positioning of the ventral apex of the supra-acetabular process of the ilium, posterodorsally to the ischial peduncle, the ratio between the proximodistal length of the metatarsal III and the mediolateral width of this element being greater than 4.5. Derived traits present in T. sinensis include curved dorsal surface of the scapula, arcuate fourth trochanter of the femur, cnemial crest of the tibia extending ventrally into the proximal half of the shaft, and the distal end of the fibula expanding into a club shape in lateral view. A potential autapomorphy is noted, being the caudal fusion of the medial and lateral condyles of the femur forming a completely enclosed “tunnel”. The body mass of the holotype of T. sinensis, is also estimated, and found to have been around 2950 kg. The phylogenetic analysis agrees with previous studies placing T. sinensis as a non-hadrosaurid hadrosauroid. Furthermore, in the phylogenetic analysis, T. sinensis is recovered as non-hadrosaurid hadrosauroid, forming a clade with Bactrosaurus johnsoni Gilmore, 1933, which shares the following unambiguous synapomorphies; the width of the orbital margin of the jugal being almost equally wide to that of the infratemporal margin of the bone; the ratio between the mediolateral width of the skull roof across the postorbitals and that across the quadrate cotyli of the paired squamosals being more than 1.20.

Abstract [sv]

Den här uppsatsen handlar om Tanius sinensis Wiman, 1929 som levde under Kritaperioden i  Shan-dongprovinsen i nordöstra Kina. Tanius sinensis hörde till gruppen ”Anknäbbsdinosaurier” som ut- vecklades under början av Kritaperioden för mellan 130-100 miljoner år sedan. I slutet av Kritaperi- oden för ungefär 84 miljoner år sedan så blev de ”primitiva” ”anknäbbsdinosaurierna” bortträngda av de mer ”avancerade” ”anknäbbsdinosaurierna”. Tanius sinensis är viktig på så vis att den kan ha varit en ”primitiv” ”anknäbbsdinosaurie” som överlevde vid en tidpunkt när de flesta andra ”primitiva” ”anknäbbsdinsoaurier” hade trängts undan. För att få en bättre bild av T. sinensis anatomiska känne- tecken och en bättre bild av dess släktskapsförhållanden, så ombeskrivs anatomin hos den del av skelettet som inte omfattar kraniet. En släktskapsanalys görs också baserat på de kännetecken som jag själv och tidigare forskare  har  observerat  i  skelettet.  De  anatomiska  observationerna avslöjar en mosaik av ”primitiva” och mer ”avancerade” karaktärer, som tillsammans  med släktskapsanalysenpekar  på att T. sinensis var en sent överlevande ”primitiv”  ”anknäbbsdinosaurie”.

Place, publisher, year, edition, pages
2015. , 124 p.
Examensarbete vid Institutionen för geovetenskaper, ISSN 1650-6553 ; 320
Keyword [en]
Tanius, Jiangjunding, postcranial, hadrosauroid, phylogeny
National Category
Other Earth and Related Environmental Sciences
URN: urn:nbn:se:uu:diva-255244OAI: diva2:821581
Educational program
Master Programme in Earth Science
2015-06-01, Småland, Geocentrum, Villvägen 16, Uppsala, 08:00 (English)
Available from: 2015-06-16 Created: 2015-06-15 Last updated: 2015-06-16Bibliographically approved

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