3/29/2017 0 Comments Plesiosaur Diet PlansPlesiosaurs ate snails and clams . You'd have to go 3. Timeline of plesiosaur research - Wikipedia. This timeline of plesiosaur research is a chronologically ordered list of important fossil discoveries, controversies of interpretation, taxonomic revisions, and cultural portrayals of plesiosaurs, an order of marine reptiles that flourished during the Mesozoic Era. The first scientifically documented plesiosaur fossils were discovered during the early 1. Mary Anning. However, now plesiosaurs are recognized as highly derived marine reptiles descended from terrestrial ancestors. Learn how global warming is impacting polar bears, their habitat and food sources. They commonly imagined plesiosaurs crawling up beaches and burying eggs like turtles. However, later opinion shifted towards the idea that plesiosaurs gave live birth and never went on dry land. During the 1. 92. Robin O'Keefe and Luis M. Chiappe concluded the debate on plesiosaur reproduction, reporting the discovery of a gravid female plesiosaur with a single large embryo preserved inside her. This species is currently regarded as of dubious taxonomic value. December. Mary Anning discovered a nearly complete Plesiosaurus skeleton near Lyme Regis. This specimen would later be catalogued as BMNH 2. December. Around the same time as the discovery of BMNH 2. Plesiosaurus specimen was discovered at the same site. Cicimurri & Everhart, 2001, Author: Felipe Elias. A nearly complete skeleton of an elasmosaurid plesiosaur (NJSM 15435. The stomach contents of NJSM 15435 indicate a piscivorous diet, with. The specimen was donated to the Oxford University museum and is probably the specimen known today as OXFUM J. Conybeare described the new species name Plesiosaurus dolichodeirus for the Plesiosaurus discovered by Anning. As the first species name given to a distinctive and well preserved Plesiosaurus skeleton it has come to be regarded as both the type specimen of Plesiosaurus dolichodeirus specifically and of the genus Plesiosaurus as a whole. The species was named by Owen in 1. The museum catalogued the specimen as BMNH 2. Carte and Bailey described the species now known as Rhomaleosaurus cramptoni. Theophilus Turner discovered the fossils of a large animal in the Pierre Shale of Kansas, USA.
The remains represented the first nearly complete plesiosaur specimen from North America. Turner gave some of its vertebrae to a member of the Union Pacific Railroad's survey named John Le. Conte. Le. Conte sent the vertebrae to Edward Drinker Cope for study. ![]() Cope recognized the find as a significant plesiosaur discovery and wrote to Turner asking him to excavate and ship the fossils to him. Webb and others collected and shipped a plesiosaur specimen to Cope. The manuscript was then distributed to other scholars. Marsh collected a better an additional specimen of Polycotylus in Kansas that was better preserved than the type described by Cope. The specimen is now catalogued as YPM 1. The fossils are the first evidence of a long-necked plesiosaur in Montana. University Communications > MSU News. Fossils from ancient sea monster found in Montana.![]() ![]() ![]() Mudge discovered ten articulated vertebrae in the Fairport Chalk of Kansas that he mistook for ichthyosaur remains. These fossils are now catalogued as KUVP 1. Mudge fragments of a large elasmosaur skeleton in the Fort Hays Limestone of Kansas. It was the first plesiosaur Mudge had ever found with gastroliths and the first plesiosaur encountered by Williston in general. The museum catalogued this specimen as OXFUM J. The specimen is now catalogued as USNM 4. Brachauchenius lucasi. West excavated a skull and partial neck belonging to the elasmosaur that would come to be named Styxosaurus snowii. The specimen is now catalogued as KUVP 1. Sternberg obtained two large elasmosaur vertebrae that would later serve as the type specimen of Elasmosaurus sternbergi. The specimen is now catalogued as KUVP 1. Cragin discovered a partial plesiosaur skeleton and associated gastroliths in what is now recognized as the Kiowa Shale. This specimen is now catalogued as KUVP 1. Plesiosaurus mudgei. Sternberg discovered the plesiosaur specimen now known as KUVP 1. Dolichorhynchops osborni. One of these was the description of the new genus and species Brachauchenius lucasi, whose type specimen was a partial skeleton discovered in Kansas. This specimen is now catalogued as USNM 4. This specimen is now known as KUVP 1. One of these was the new species Elasmosaurus nobilis. He remarked that these fossils were the largest elasmosaur vertebrae that he had ever seen. Sternberg discovered a third specimen of Dolichorhynchops osborni in Kansas. Walker discovered a well- preserved large elasmosaur specimen. In Army Downs they discovered a nearly complete specimen of Kronosaurus. The University of Nebraska State Museum bought the elasmosaur specimen discovered by Sternberg and Walker in 1. The specimen is now catalogued as UNSM 1. The specimen is now catalogued as KUVP 5. However, the specimen was damaged during the excavation and only the skull and chest region were successfully extracted. Fortunately, a cast of the specimen survived in the British Museum. The poorly preserved bones required a significant amount of plaster for the restoration, earning the specimen the mocking nickname . This specimen, now known as FHSM VP- 3. Brachauchenius type specimen. Although it was put on display soon after discovery, it would not be described for the scientific literature for nearly 5. These fossils are now catalogued as FHSM VP- 3. After a break from digging the Johnston team returned to find all of the fossils crudely extracted from the rock except for a flipper that the team had reburied. Based on the flipper, the stolen plesiosaur could be identified as Trinacromerum bentonianum. However, while criticizing Robinson's work they were reluctant to make any positive claims of their own, concluding that the details of plesiosaur locomotion were . Thulborn published the results of his recent re- examination of the purported plesiosaur embryos discovered by Harry Govier Seeley. Thulborn concluded that Seeley's supposed embryos were actually nodules of mudstone and shale derived from sediments that once filled in a crustaceanburrow system and were not even animal body fossils. Its preparator, Paul Willis nicknamed it Eric. An entrepreneur named Sid Londish bought the specimen and funded its preparation, but went bankrupt. When the specimen was put up for auction fear spread that a potential buyer might break the specimen down for its gemstone value. A television drive was arranged on behalf of the Australian Museum. The Museum succeeded in raising 3. Eric was later identified as a specimen of Leptocleidus. She concluded that the long- necked plesiosauroids ate soft prey. Liopleurodon and its relatives, on the other hand, had teeth resembling those of killer whales and probably ate larger, bonier prey. Stewart, accompanied by Everhart, discovered a nearly complete Dolichorhynchops rear flipper in the lower Smoky Hill Chalk. Unfortunately it was too late to correct the erroneous statements in his aforementioned paper regarding the supposed rarity of plesiosaurs in the lower Smoky Hill Chalk. The flipper is now catalogued as LACMNH 1. Molnar published suspicion that the . Some of the fossils seemed to have been partially digested. The remains were later catalogued as FHSM VP- 1. Stewart, who recognized them as pieces of a plesiosaur skull. The fossils are now catalogued as . Everhart discovered an additional partial plesiosaur skeleton. Bakker nicknamed the long- necked plesiosaurs . Bakker argued that plesiosaurs suffered several major extinction events throughout the Mesozoic rather than continuously diversifying until the end- Cretaceousmass extinction. Bakker argued that Dolichorhynchops and its relatives became the most common kind of short- necked plesiosaur in the Cretaceous Western Interior Seaway after the ichthyosaurs became extinct. Further, they convergently evolved many traits similar to those of ichthyosaurs like long snouts and large eyes. They hypothesized that a Kronosaurus was the culprit. Storrs formally described the world's smallest plesiosaur for the scientific literature. It is more plausible to think that this young individual was born in the seaway itself rather than surviving the extremely long swim from shore. So, the specimen provided circumstantial evidence for live birth and possibly even parental care by pliosaurs in the Cretaceous Western Interior Seaway. Further, the fossil site had been heavily vandalized before discovery by scientists. A large hole was located near the baby pliosaur that could have once held the bones of its mother or other pod members. In this paper he both revised these plesiosaurs' taxonomy as well as offering observations on their biostratigraphy and evolution. This represents a span of time approximating 3. He found Dolichorhynchops osborni to have had an even longer lifespan, from the middle Turonian to the early Campanian., or roughly 4 million years. His research also suggested that there was a span of time during the life of the Western Interior Seaway in which it was not inhabited by polycotylids. In fact the Pierre Shale specimens of Dolichorhynchops were nearly as large as Brachauchenius lucasi. Although a significant portion of the specimen was missing, it implied a life length of more than 2 m. The researchers tentatively attributed the flipper to Brachauchenius lucasi. The specimen is now catalogued as FHSM VP- 1. Although they could not identify its exact species, the specimen was significant because its stomach contents provided clues to long- necked plesiosaur diets. This individual's gut preserved the beaks of thirty small ammonites. Long bemoaned the fact that the putative . However, Storrs did agree that it was an elasmosaur specimen rather than a pliosaur as argued by Welles in 1. The specimen was associated with roughly 1. The largest of these was 1. Everhart would later compare its size to that of a softball and observe that not only was it one of the largest known plesiosaur gastroliths, but also one of the largest gastroliths from any animal. A paleontologist at the museum named Ben Kear identified it as a member of the genus Leptocleidus. The two foot long specimen was the smallest specimen of the genus ever found and probably a baby. Cicimiurri and Michael J. Everhart published a study of the Styxosaurus snowii specimen NJSM 1.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. Archives
June 2017
Categories |