Dick Baridakara

Dinosaurs (GEOL 106) Final Poster Project By: Keilyn Vargas- Ulloa Starring: Yangchuanosaurus, Rhamphorhynchus and Dorsetensia Starring Animal: Genus Yangchuanosaurus https://en.wikipedia.org/wiki/Yangchuanosaurus First Described by: Dong Zhiming in 1978 MLA 9th Edition (Modern Language Assoc.) Lucas, Spencer G. Ancient Creatures. Salem Press, 2014. Figure 1A (above): Yangchuanosaurus reconstruction of skeleton (from https://www.deviantart.com/spinoinwonderland/art/Yangchuanosaurus-shangyouensi s-skeletals-) Figure 1B : Bones discovered (from https://www.paleo-nerd.com/wp-cont ent/uploads/2023/12/Yangchuanosau rus-arto-anteriore-1-zigongensis.jpg Geologic Time Period: Jurassic period to Cretaceous period. Started ~201 Ma and ended 145 Ma. Figure 1A (above): Yangchuanosaurus reconstructed body shape & size (from https://dinosaurpictures.org/Yangchuanosaurus-pictures Taxonomy: Yangchuanosaurus belongs to the Saurischia clade. suborder Theropoda Size: Length 9 m (29.5 ft), Height 2 m (6.5 ft) Weight: 900-1,100 kg (2,000-2,600 lbs) Life span: Approximately 20 years Diet: Carnivores who consumed medium-sized plate-backed stegosaurs and the long-necked sauropods. Habitat: Yangchuanosaurus was a terrestrial dinosaur, living primarily on land. Diagnostic characteristics ❖ Their hips had a pubis bone pointing forward relative to ischium bone (=not parallel to ischium), it helped them move faster/more efficiently ❖ Most Saurischia had forelimbs that had a 1st digit (thumb) that was extra flexible or semi-opposable= it could move part way across the palm. this arrangement helped therapods hold food and/or grab prey. ❖ Saurischian teeth sit at the outer edge of their mouths Figure 1D: Collections and Occurrences of Yangchuanosaurus present in China (from https://web-p-ebscohost-com.ezproxy.greenriver.edu/ehost/ebookviewer/eboo k?sid=4f5ddd-b8f-823c-b8b5e2a5a9b4%40redis&vid=0&format=E B) Figure 1E: Map of continents during the jurassic period (201-145 MA) When Yangchuanosaurus was alive. Shows the dinosaur could have migrated across Mongolia, parts of Russia, and potentially even Europe based on the land connections during the Jurassic period. (from https://dinosaurpictures.org/ancient-earth#170) Co-Starring Animal: Genus Rhamphorhynchus: first described by: Georg zu Münster in 1831 https://en.wikipedia.org/wiki/Rhamphorhynchus Taxonomy: Rhamphorhynchus belongs to the old-style classic taxonomic class of Pterosaurs. Size: The overall body length, including the tail, ranges from 50 to 75 centimeters. Weight: 2 to 10 kilograms, depending on the individual specimen Diet: Rhamphorhynchus have been discovered with preserved stomach contents, which include fish remains Habitat: Rhamphorhynchus inhabited an aerial environment. It spent most of its life flying over ancient seas, lakes, and rivers. Figure 2A: Skeletal reconstruction of Rhamphorhynchus from https://blog.everythingdinosaur.com/blog/_archives/20 16/08/14/thoughts-on-rhamphorhynchus.html characteristics Aerial Adaptation: Pterosaurs are characterized for having an ability to fly. They had relatively thin bones, large extended wings made of skin and a special wing design that enabled them to move and fly. Heterodont Teeth: Pterosaurs had various kind of teeth; short and sharp for gripping Fish and other prey species. They had teeth adapted to the type of diet they consumed. Figure 2B: Displays occurrences and collections of 5 Rhamphorhynchus located in solnhofen Limestone, Bavaria, Germany and Switzerland. (https://paleobiodb.org/navigator/) Figure 2C: Artist's impression of Rhamphorhynchus . (from https://www.pteros.com/pterosaurs/rhamphorhynchus.html Geologic Time Period of Rhamphorhynchus: Rhamphorhynchus existed during the Late Jurassic period. Specifically, it lived during the Tithonian stage, which occurred approximately 152 to 145 million years ago. This pterosaur genus thrived in the Late Jurassic landscapes, soaring the skies over ancient seas and landscapes, alongside other iconic dinosaurs and prehistoric creatures of that time. Figure 2C: image showing the size of Rhamphorhynchus . (from https://www.pteros.com/pterosaurs/rhamphorhynchus.html Supporting Animal: Genus Dorsetensia (first described by the English paleontologist M.A. McGowan in 1974) : https://en.wikipedia.org/wiki/Dorsetensia Taxonomy: Dorsetensia belongs to the class Reptilia, which includes all reptiles. More specifically, it falls within the order Ichthyosauria, Taxonomic phylum: Mollusca, Modern animal belonging to the same phylum is the garden snail Size: Dorsetensia typically reached lengths of about 2 to 3 meters (6.6 to 9.8 feet). Weight: 200 to 400 kilograms Diet: Fish, Cephalopods, Small Marine Reptiles Habitat: Aquatic habitat Figure 3A(above): shape & size of Dorsetensia romani (from http://www.bajocien14.com/article-dorsetensia-romani-.html) Characteristics: streamlined, dolphin-like body shape: This streamlined body design was highly adapted for efficient swimming in marine environments, allowing Dorsetensia to be a fast and agile predator. The streamlined body would have reduced water resistance, facilitating swift movement through the water while hunting for prey such as fish and cephalopods. Geologic Time Period : Dorsetensia is a narrowly coiled discoidal ammonite from the early Middle Jurassic, lower Bajocian, belonging to the family Sonniniidae of the superfamily Hildoceratoidea. Figure 3C(above): Dorsetensia fossils have primarily been discovered in the United Kingdom, particularly in the coastal regions of southern England.(From https://paleobiodb.org/navigator/ Bibliography 1. 2. 3. 4. 5. 6. 7. GRC Holman Library Article- Lucas, Spencer G. Ancient Creatures. Salem Press, 2014. https://web-p-ebscohost-com.ezproxy.greenriver.edu/ehost/ebookviewer/ebook?sid=4f5ddd-b8f-823c-b8b5e2a5a9b4% 40redis&vid=0&format=EB Website: Wikipedia (page last edited May 4, 2024) Yangchuanosaurus. Retrieved June 6, 2024. Web address: https://en.wikipedia.org/wiki/Yangchuanosaurus Z. Dong and S. Zhou. 1983. [Dinosaurs from the Jurassic of Sichuan]. Palaeontologica Sinica, New Series C, Whole Number 162(23):1-136: https://naturalhistory.si.edu/sites/default/files/media/translated_publications/Dong%26amp%3B_83.pdf Website: Everything Dinosaur (August 16, 2016) Rhamphorhynchus Retrieved June 6, 2024. Web Address: https://blog.everythingdinosaur.com/blog/_archives/2016/08/14/thoughts-on-rhamphorhynchus.html Website: Wikipedia (page last edited April 29, 2024) Rhamphorhynchus. Retrieved June 6, 2024. Web address: https://en.wikipedia.org/wiki/Rhamphorhynchus Website: Wikipedia (page last edited April 29, 2024) Rhamphorhynchus. Retrieved June 6, 2024. Web address: https://en.wikipedia.org/wiki/Dorsetensia GRC Holman Library Article-Imlay, R. W. (1964). Middle and Upper Jurassic fossils from southern California. Journal of Paleontology, 38(3), 505-509. https://www-jstor-org.ezproxy.greenriver.edu/stable/-?sid=primo&seq=1