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1912 In Paleontology
Plants Angiosperms Arthropod paleontology Vertebrate paleontology non-mammalian synapsids Mammalians Dinosaurs Expeditions, field work, and fossil discoveries * William Edmund Cutler first began collecting fossils, choosing the mouth of Kneehills Creek in Alberta as a prospecting site. According to paleontologist Darren Tanke, Cutler was motivated by "commercial gain".D. H. Tanke. 2010. Lost in plain sight: rediscovery of William E. Cutler's missing Eoceratops. In M. J. Ryan, B. J. Chinnery-Allgeier, D. A. Eberth (eds.), New Perspectives on Horned Dinosaurs: The Royal Tyrrell Museum Ceratopsian Symposium. Indiana University Press, Bloomington 541-550. * Charles H. Sternberg and his sons began working under a contract with the Geological Survey of Canada, which at the time was responsible for maintaining the National Museum of Canada. Lawrence Lambe occupied a supervisory position in the project. The Sternbergs were in competition with Barnum Brown of the American Museum ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leanchoiliidae
Megacheira ("great hands", also historically great appendage arthropods) is an extinct class of predatory arthropods defined by their possession of spined "great appendages". Their taxonomic position is controversial, with studies either considering them stem-group euarthropods, or stem-group chelicerates. The homology of the great appendages to the cephalic appendages of other arthropods is also controversial. Uncontested members of the group were present in marine environments worldwide from the lower Cambrian to the upper Ordovician. Morphology Megacheirans are defined by their possession of uniramous "great appendages", which are their first pair of head appendages. The first one or two proximalmost segments/podomeres are spineless (it has been argued that the supposed first of the two proximal podomeres is actually an arthrodial membrane), while the remaining 3–4 more distal podomeres each typically bear a single upward pointing spine attached towards the distal end ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ictidopsis
''Thrinaxodon'' is an extinct genus of cynodonts which lived in what are now South Africa and Antarctica during the Late Permian - Early Triassic. ''Thrinaxodon'' lived just before, during, and right after the Permian–Triassic mass extinction event. It is known from a single species, ''T. liorhinus''. Similar to other therapsids, ''Thrinaxodon'' adopted a semi-sprawling posture, an intermediary form between the sprawling position of basal tetrapods and the more upright posture present in current mammals.Blob R. 2001. Evolution of hindlimb posture in non-mammalian therapsids: biomechanical tests of paleontological hypotheses. 27(1): 14-38. ''Thrinaxodon'' is prevalent in the fossil record in part because it was one of the few carnivores of its time, and was of a larger size than similar cynodont carnivores. Its survival during the Permian-Triassic extinction event may have been due to its burrowing habits. Description ''Thrinaxodon'' was a small synapsid roughly the size of a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Galeops
''Galeops'' is an extinct genus of anomodont therapsids from the Middle-Late Permian of South Africa. It was described by Robert Broom in 1912. Some cladistic analyses have recovered it as closely related to dicynodonts. See also * List of therapsids This list of therapsids is an attempt to create a comprehensive listing of all Genus, genera that have ever been included in the Therapsida excluding mammals and purely vernacular terms. The list includes all commonly accepted genera, but also gene ... References Anomodont genera Fossil taxa described in 1912 Taxa named by Robert Broom {{anomodont-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Emydops
''Emydops'' is an extinct genus of dicynodont therapsids from the Middle Permian to Late Permian of what is now South Africa. The genus is generally small and herbivorous, sharing the dicynodont synapomorphy of bearing two tusks. In the following years, the genus grew to include fourteen species. Many of these species were erected on the basis of differences in the teeth and the positioning of the frontal and parietal bones. A 2008 study narrowed ''Emydops'' down to two species, ''E. arctatus'' (first described by English paleontologist Richard Owen as ''Kistecephalus arctatus'' in 1876) and the newly described ''E. oweni''. History and discovery ''Emydops'' was first discovered and named in 1912 by Robert Broom, in which he described the species ''E. minor''. Although later on it was suggested that the genus included 13 more species, Frobisch and Reisz (2008) suggests that only ''E. oweni'' and ''E. arctatus'' are the only valid species of ''Emydops''. With the appearance o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Emydochampsa
''Endothiodon'' (/ɛndoʊθiːoʊdɔːn/ "inner tooth" from Greek endothi (ἔνδοθῐ), "within", and odon (ὀδών), "tooth", most likely named for the characteristic of the teeth being placed internally to the maxilla) is an extinct genus of medium to large dicynodont from the Late Permian. Like other dicynodonts, ''Endothiodon'' was an herbivore, but it typically lacked the two tusks that characterized most other dicynodonts and instead had long rows of teeth inset in the jaws that replaced in waves. The anterior portion of the upper and lower jaw are curved upward, creating a distinct beak that is thought to have allowed them to be specialized grazers.Latimer E. M., Gow C. E., Rubidge B. S. "Dentition and feeding niche of ''Endothiodon'' (Synapsida;Anomodontia)" Palaeontologia Africana 32, 75-82 (1995) ''Endothiodon'' was widespread and is found across the southern region of what was then a single large continent known as Pangea. It was originally only found in southern ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alopecorhinus
''Alopecorhinus'' is an extinct genus of therocephalian therapsids. See also * List of therapsids This list of therapsids is an attempt to create a comprehensive listing of all Genus, genera that have ever been included in the Therapsida excluding mammals and purely vernacular terms. The list includes all commonly accepted genera, but also gene ... References The main groups of non-mammalian synapsids at Mikko's Phylogeny Archive Scylacosauridae Fossil taxa described in 1912 Taxa named by Robert Broom Therocephalia genera {{paleo-therapsid-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
20191020 Yohoia Tenuis
Year 191 ( CXCI) was a common year starting on Friday of the Julian calendar. At the time, it was known as the Year of the Consulship of Apronianus and Bradua (or, less frequently, year 944 ''Ab urbe condita''). The denomination 191 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years. Events By place Parthia * King Vologases IV of Parthia dies after a 44-year reign, and is succeeded by his son Vologases V. China * A coalition of Chinese warlords from the east of Hangu Pass launches a punitive campaign against the warlord Dong Zhuo, who seized control of the central government in 189, and held the figurehead Emperor Xian hostage. After suffering some defeats against the coalition forces, Dong Zhuo forcefully relocates the imperial capital from Luoyang to Chang'an. Before leaving, Dong Zhuo orders his troops to loot the tombs of the Han emperors, and then destroy Luoyang b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yohoiida
''Yohoia'' is an extinct genus of megacheiran arthropod from the Cambrian period that has been found as fossils in the Burgess Shale formation of British Columbia, Canada. The type species, ''Yohoia tenuis'', was described in 1912 by Walcott, who considered it an anostracan crustacean. 711 specimens of ''Yohoia'' are known from the Greater Phyllopod bed, where they comprise 1.35% of the community. In 2015, Conway Morris ''et al.'' reported another species, ''Y. utahana'', from the Marjum Formation, Utah. Description Fossil specimens of ''Yohoia'' range in size from 7 to 23 mm, they have a head shield which is followed by 13 trunk tergites, or plates. On both sides, the bottom side of the first 10 of these ended in backward-pointing, triangular points or projections. The last three plates were complete tubes, circling the entire trunk. At the end of the trunk was a paddle-like tail. There were also a pair of large extensions at the front of the head shield. They had a p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Waptia Fossils
''Waptia'' is an extinct genus of marine arthropod from the Middle Cambrian of North America. It grew to a length of , and had a large bivalved carapace and a segmented body terminating into a pair of tail flaps. It was an active swimmer and likely a predator of soft-bodied prey. It is also one of the oldest animals with direct evidence of brood care. ''Waptia fieldensis'' is the only species classified under the genus ''Waptia'', and is known from the Burgess Shale ''Lagerstätte'' of British Columbia, Canada. Specimens of ''Waptia'' are also known from the Spence Shale of Utah, United States. Based on the number of individuals, ''Waptia fieldensis'' is the third most abundant arthropod from the Burgess Shale Formation, with thousands of specimens collected. It was among the first fossils found by the American paleontologist Charles D. Walcott in 1909. He described it in 1912 and named it after two mountains near the discovery site – Wapta Mountain and Mount Field. Althoug ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hymenocarina
Hymenocarina is an Order (biology), order of extinct marine arthropods known from the Cambrian. They possess bivalved carapaces, typically with exposed posteriors. Members of the group are morphologically diverse and had a variety of ecologies, including as filter feeders and as predators. Recent research has generally considered them to be stem or crown group members of Mandibulata, due to the presence of Mandible (arthropod mouthpart), mandibles in well-preserved species. Taxonomy Hymenocarines are characterized by the combination of the following characters: bivalved, convex carapace covering Cephalothorax, cephalothoracic (combined head and thorax) region; cephalothorax bearing multisegmented antennae (though as an exception antennae are absent in ''Odaraia'') and rounded Mandible (arthropod mouthpart), mandibles and likely Maxilla (arthropod mouthpart), maxillae, post maxillae limbs with spiny, subdivided basis and Arthropod leg, endopods (lower, leg-like parts) with well-d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
