Post by dinosauria101 on Oct 16, 2019 16:24:10 GMT 5
Elasmosaurus platyurus
Elasmosaurus (/ɪˌlæzməˈsɔːrəs, -moʊ-/;[2]) is a genus of plesiosaur that lived in North America during the Campanian stage of the Late Cretaceous period, about 80.5 million years ago. The first specimen was discovered in 1867 near Fort Wallace, Kansas, and was sent to the American paleontologist Edward Drinker Cope, who named it E. platyurus in 1868. The generic name means "thin-plate reptile", and the specific name means "flat-tailed". Cope originally reconstructed the skeleton of Elasmosaurus with the skull at the end of the tail, an error which was made light of by the paleontologist Othniel Charles Marsh, and became part of their "Bone Wars" rivalry. Only one incomplete Elasmosaurus skeleton is definitely known, consisting of a fragmentary skull, the spine, and the pectoral and pelvic girdles, and a single species is recognized today; other species are now considered invalid or have been moved to other genera. In 1952 the American paleontologist Samuel Welles estimated the body length to have been 10.3 meters (34 ft).[6] In his 1869 description of Elasmosaurus, the American paleontologist Edward Drinker Cope estimated the length of the animal by summing up vertebral lengths and estimations of missing parts, resulting in a total length of 13.1 meters (520 in). The living animal would have been slightly larger due to cartilage present between the vertebral bodies, and was estimated by Cope at roughly 13.7 meters (45 ft). Like other elasmosaurids, Elasmosaurus would have had a slender, triangular skull. The snout was rounded and almost formed a semi-circle when viewed from above, and the premaxillae (which form the front of the upper jaw) bore a low keel at the midline. It is uncertain how many teeth Elasmosaurus had, due to the fragmentary state of the fossils.
images.dinosaurpictures.org/elasmosaurus-platyurus-a-prehistoric-sergey-krasovskiy_1ead.jpg
Giant Beaver - Castoroides ohioensis
Castoroides, or giant beaver, is an extinct genus of enormous beavers that lived in North America during the Pleistocene. C. leiseyorum and its northern sister species C. ohioensis, were the largest beavers to ever exist. Species of Castoroides, also known as giant beavers, were much larger than modern beavers. Their average length was approximately 1.9 m (6.2 ft), and they could grow as large as 2.2 m (7.2 ft). The weight of the giant beaver could vary from 90 kg (198 lb) to 125 kg (276 lb). This makes it the largest known rodent in North America during the Pleistocene and the largest known beaver. However recent analyses suggest that they weighed some 77 kg (170 lb), but this is disputable. Because soft tissues decay, it is not known whether its tail resembled the tails of modern beavers, and it can only be assumed that its feet were webbed as in modern species. The skull structure of the giant beaver shows that it presumably participated in extended underwater activity, thanks to the ability to take in more oxygen into its lungs. One of the defining characteristics of the giant beaver was their incisors, which differ in size and shape from those of modern beavers. Modern beavers have chisel-like incisor teeth for gnawing on wood, while the teeth of the giant beaver were bigger and broader, and grew to about 15 cm (6 in) long. These incisors were not as efficient at cutting wood; therefore, it is possible that the giant beaver did not construct dams.
prehistoric-fauna.com/image/cache/data/Castoroides-ohioensis-2018-738x591.jpg
Credit to Wikipedia
NOTE: I know this might seem a bit unfair given the size difference, but since Elasmosaurus has a very small head and a very long and vulnerable neck I think it needs a very good size advantage to be a fair fight
Elasmosaurus (/ɪˌlæzməˈsɔːrəs, -moʊ-/;[2]) is a genus of plesiosaur that lived in North America during the Campanian stage of the Late Cretaceous period, about 80.5 million years ago. The first specimen was discovered in 1867 near Fort Wallace, Kansas, and was sent to the American paleontologist Edward Drinker Cope, who named it E. platyurus in 1868. The generic name means "thin-plate reptile", and the specific name means "flat-tailed". Cope originally reconstructed the skeleton of Elasmosaurus with the skull at the end of the tail, an error which was made light of by the paleontologist Othniel Charles Marsh, and became part of their "Bone Wars" rivalry. Only one incomplete Elasmosaurus skeleton is definitely known, consisting of a fragmentary skull, the spine, and the pectoral and pelvic girdles, and a single species is recognized today; other species are now considered invalid or have been moved to other genera. In 1952 the American paleontologist Samuel Welles estimated the body length to have been 10.3 meters (34 ft).[6] In his 1869 description of Elasmosaurus, the American paleontologist Edward Drinker Cope estimated the length of the animal by summing up vertebral lengths and estimations of missing parts, resulting in a total length of 13.1 meters (520 in). The living animal would have been slightly larger due to cartilage present between the vertebral bodies, and was estimated by Cope at roughly 13.7 meters (45 ft). Like other elasmosaurids, Elasmosaurus would have had a slender, triangular skull. The snout was rounded and almost formed a semi-circle when viewed from above, and the premaxillae (which form the front of the upper jaw) bore a low keel at the midline. It is uncertain how many teeth Elasmosaurus had, due to the fragmentary state of the fossils.
images.dinosaurpictures.org/elasmosaurus-platyurus-a-prehistoric-sergey-krasovskiy_1ead.jpg
Giant Beaver - Castoroides ohioensis
Castoroides, or giant beaver, is an extinct genus of enormous beavers that lived in North America during the Pleistocene. C. leiseyorum and its northern sister species C. ohioensis, were the largest beavers to ever exist. Species of Castoroides, also known as giant beavers, were much larger than modern beavers. Their average length was approximately 1.9 m (6.2 ft), and they could grow as large as 2.2 m (7.2 ft). The weight of the giant beaver could vary from 90 kg (198 lb) to 125 kg (276 lb). This makes it the largest known rodent in North America during the Pleistocene and the largest known beaver. However recent analyses suggest that they weighed some 77 kg (170 lb), but this is disputable. Because soft tissues decay, it is not known whether its tail resembled the tails of modern beavers, and it can only be assumed that its feet were webbed as in modern species. The skull structure of the giant beaver shows that it presumably participated in extended underwater activity, thanks to the ability to take in more oxygen into its lungs. One of the defining characteristics of the giant beaver was their incisors, which differ in size and shape from those of modern beavers. Modern beavers have chisel-like incisor teeth for gnawing on wood, while the teeth of the giant beaver were bigger and broader, and grew to about 15 cm (6 in) long. These incisors were not as efficient at cutting wood; therefore, it is possible that the giant beaver did not construct dams.
prehistoric-fauna.com/image/cache/data/Castoroides-ohioensis-2018-738x591.jpg
Credit to Wikipedia
NOTE: I know this might seem a bit unfair given the size difference, but since Elasmosaurus has a very small head and a very long and vulnerable neck I think it needs a very good size advantage to be a fair fight
