Monday, March 21, 2011

The Sauropodomorph Database Approacheth- "Yibinosaurus" and "Sugiyamasaurus"

The Sauropodomorph Database is almost ready to debut, but first here's a couple more entries to illustrate why I'm making the website.  The first is "Yibinosaurus", whose usual online information is limited to what Olshevsky wrote on the DML in 2001.  The other is "Sugiyamasaurus", which no one seems to have connected to Fukuititan yet. 

"Yibinosaurus" Ouyang vide anonymous, 2001
"Y. zhoui" Ouyang vide anonymous, 2001
Toarcian, Early Jurassic
Dongyuemiao Member of Ziliujing Formation, Sichuan, China
- (Chongqing Museum of Natural History coll.) specimen including dorsal vertebrae
Comments- This name originally appeared in a guidebook, with the taxon stated to be under study by Ouyang. Ouyang (2003) later mentioned it in his thesis as a new genus, which he places in an eponymous subfamily within Vulcanodontidae. As he also includes the more basal Gongxianosaurus in Vulcanodontidae, Ouyang's conception of the family may be more of a grade. Ouyang further notes the anterior dorsal neural spines are transversely expanded, which he believes indicates a possible relationship to taxa with bifurcated spines like Datousaurus. As Ouyang states "Yibinosaurus" is from the same locality as Gongxianosaurus, the dorsal vertebrae, 51 articulated caudal vertebrae, scapulae and ilium mentioned by Luo and Wang (1999) as Gongxianosaurus sp. nov. may be the "Yibinosaurus" material.
References- Luo and Wang, 1999. New discovery on dinosaur fossils from Early Jurassic, Sichuan, China. Chinese Science Bulletin. 44(23), 2182-2188.
Anonymous, 2001. Dinosaur Fossils from Chongqing Natural History Museum.
Ouyang, 2003. Skeletal characteristics of Mamenchisaurus youngi and the systematics of mamenchisuarids. PhD thesis. Chengdu University of Technology. 176 pp.

Titanosauriform tooth (FPDM coll.) from the Kitadani Formation, probably Fukuititan and/or "Sugiyamasaurus".  Scale = 10 mm.  After Goto et al. (2002).

Fukuititan Azuma and Shibata, 2010
?= "Sugiyamasaurus" Lambert, 1990
F. nipponensis Azuma and Shibata, 2010
Barremian, Early Cretaceous
Kitadani Formation of the Akaiwa Subgroup of the Tetori Group, Japan
- (FPDM V8468) three teeth, incomplete cervical neural arch, three distal caudal vertebrae (30 mm), proximal scapula, incomplete humeri (~910 mm), incomplete radii (~600 mm), metacarpal IV (295 mm), incomplete ischia, partial femur (~1.14 m), partial tibia, fibula, pedal phalanx (130 mm), fragments
Referred- ?(Sugiyama-ryu; "Sugiyamasaurus") three teeth (Azuma, 1991)
? five teeth (Azuma, 1991)
?(FPDM 1080417) tooth (Goto et al., 2002)
?(FPDM 1080417-A) tooth (Goto et al., 2002)
?(FPDM 1080757) tooth (Goto et al., 2002)
?(FPDM 1080920) tooth (Goto et al., 2002)
?(FPDM 1080942) tooth (Goto et al., 2002)
?(FPDM 1080944) tooth (Goto et al., 2002)
Diagnosis- (after Azuma and Shibata, 2010) tooth crowns asymmetrical and elongated with weak or absent labial groove and no lingual concavity; stalk-like cervical epipophyses; humerus proximal width 32% of length; metacarpal IV 48% of radial length; ischia slightly expanded distally.
Comments- The holotype was discovered in 2007 and described as a basal titanosauriform, though it has yet to be included in an analysis.
Teeth were first discovered from the quarry in 1989. Three teeth were informally called "Sugiyama-ryu", as found in Azuma (1991) and referred to Camarasauridae by this author and Dong et al. (1990). Lambert (1990) inappropriately made it into a genus name, listing it as "Sugiyamasaurus" in a childrens' book. Azuma (1991) lists five additional sauropod teeth as family indet. A and B, but he later (2003) placed all the teeth in Brachiosauridae. Kobayashi et al. (2006) referred the specimens to Titanosauriformes indet. based on near identical morphology to teeth from the Kuwajima Formation. Goto et al. (2002) illustrate a tooth. As the "Sugiyamasaurus" teeth are generally similar to Fukuititan's in morphology (D-shaped section; wrinkled enamel; parallel mesial and distal edges- Kobayashi et al., 2006) and found in the same quarry, they may belong to the same taxon. They should be examined for Fukuititan's supposed dental autapomorphies, which should be checked for positional variation and compared to other taxa as well.
References- Dong, Hasegawa and Azuma, 1990. The Age of Dinosaurs in Japan and China. Fukui, Japan: Fukui Prefectural Museum. 65 pp.
Lambert, 1990. The Dinosaur Data Book. New York: Avon Books, 66. ISBN 0-380-75896-3.
Azuma, 1991. Early Cretaceous Dinosaur Fauna from the Tetori Group, central Japan. Research on Dinosaurs from the Tetori Group (1). Professor S. Miura Memorial Volume, 55-69.
Azuma, Kawagoshi and Miyagawa, 1995. Dinosaurs of the Tetori Group in Japan. Fukui Prefectural Museum. 158 pp.
Azuma and Tomida, 1995. Early Cretaceous dinosaur fauna of the Tetori Group in Japan. in Sun and Wang (eds.). Sixth Symposium on Mesozoic Terrestrial Ecosystems and Biota, Short Papers. China Ocean Press, Beijing. 125-131.
Goto, Yabe and Sano, 2002. The research report of the Dinosaur Fossil Exploratory Excavation held by Fukui Prefecture in 2001. Memoir of the Fukui Prefectural Dinosaur Museum. 1, 102-118.
Azuma, 2003. Early Cretaceous vertebrates from Katsuyama City, Fukui Prefecture, Japan. Memoir of the Fukui Prefectural Dinosaur Museum. 2, 17-21.
Kobayashi, Manabe, Ikegami, Tomida and Hayakawa, 2006. Dinosaurs from Japan. in Lu, Kobayashi, Huang and Lee (eds.). Papers from the 2005 Heyuan International Dinosaur Symposium. Geological Publishing House, Beijing. 87-102.
Shibata and Goto, 2008. Report of the 3rd Dinosaur Excavation Project in Katsuyama, Fukui, 2007. Memoir of the Fukui Prefectural Dinosaur Museum. 7, 109-116.
Azuma and Shibata, 2010. Fukuititan nipponensis, a new titanosauriform sauropod from the Early Cretaceous Tetori Group of Fukui Prefecture, Japan. Acta Geologica Sinica. 84(3), 454-462.

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