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Paleontology, also spelled palaeontology or palæontology, is the scientific study of life that existed prior to, and sometimes including, the start of the Holocene epoch. It includes the study of fossils to classify organisms and study their interactions with each other and their environments. Paleontological observations have been documented as far back as the 5th century BC. The science became established in the 18th century as a result of Georges Cuvier's work on comparative anatomy, and developed rapidly in the 19th century. The term has been used since 1822 formed from Greek παλαιός, ὄν, and λόγος.
Placental mammals are one of the three extant subdivisions of the class Mammalia, the other two being Monotremata and Marsupialia. Placentalia contains the vast majority of extant mammals, which are partly distinguished from monotremes and marsupials in that the fetus is carried in the uterus of its mother to a relatively late stage of development. The name is something of a misnomer considering that marsupials also nourish their fetuses via a placenta, though for a relatively briefer period, giving birth to less developed young which are then nurtured for a period inside the mother's pouch. Placentalia represents the only living group within Eutheria, which contains all mammals more closely related to placentals than to marsupials.
Metatheria is a mammalian clade that includes all mammals more closely related to marsupials than to placentals. First proposed by Thomas Henry Huxley in 1880, it is a more inclusive group than the marsupials; it contains all marsupials as well as many extinct non-marsupial relatives.
An evolutionary radiation is an increase in taxonomic diversity that is caused by elevated rates of speciation, that may or may not be associated with an increase in morphological disparity. A significantly large and diverse radiation within a relatively short geologic time scale is often referred to as an explosion. Radiations may affect one clade or many, and be rapid or gradual; where they are rapid, and driven by a single lineage's adaptation to their environment, they are termed adaptive radiations.
Leigh Van Valen was an American evolutionary biologist. At the time of his death, he was professor emeritus in the Department of Ecology and Evolution at the University of Chicago.
In the geological timescale, the Tithonian is the latest age of the Late Jurassic Epoch and the uppermost stage of the Upper Jurassic Series. It spans the time between 149.2 ±0.7 Ma and 145.0 ± 4 Ma. It is preceded by the Kimmeridgian and followed by the Berriasian.
The evolution of birds began in the Jurassic Period, with the earliest birds derived from a clade of theropod dinosaurs named Paraves. Birds are categorized as a biological class, Aves. For more than a century, the small theropod dinosaur Archaeopteryx lithographica from the Late Jurassic period was considered to have been the earliest bird. Modern phylogenies place birds in the dinosaur clade Theropoda. According to the current consensus, Aves and a sister group, the order Crocodilia, together are the sole living members of an unranked reptile clade, the Archosauria. Four distinct lineages of bird survived the Cretaceous–Paleogene extinction event 66 million years ago, giving rise to ostriches and relatives (Palaeognathae), waterfowl (Anseriformes), ground-living fowl (Galliformes), and "modern birds" (Neoaves).
The evolution of the molluscs is the way in which the Mollusca, one of the largest groups of invertebrate animals, evolved. This phylum includes gastropods, bivalves, scaphopods, cephalopods, and several other groups. The fossil record of mollusks is relatively complete, and they are well represented in most fossil-bearing marine strata. Very early organisms which have dubiously been compared to molluscs include Kimberella and Odontogriphus.
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Alan H. Cheetham is a paleobiologist and retired senior scientist and curator of invertebrate paleontology at the Smithsonian Institution's National Museum of Natural History.
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Charles Richard Marshall is an Australian paleobiologist and the director of the University of California Museum of Paleontology, where he is also a professor in the department of Integrative Biology at the University of California, Berkeley.
Roger Lansing Grande, more commonly known as Lance Grande, is an evolutionary biologist and curatorial scientist. His research and work is focused on Paleontology, Ichthyology, Systematics and Evolution. He is well known for his work on the paleontology of the Green River Formation and for his detailed monographs on the comparative anatomy and evolution of ray-finned fishes. He has also published books on broader issues, engaging larger audiences on the importance of the natural and the social sciences.
This list 2019 in paleomalacology is a list of new taxa of ammonites and other fossil cephalopods, as well as fossil gastropods, bivalves and other molluscs that are scheduled to be described during the year 2019, as well as other significant discoveries and events related to molluscan paleontology that are scheduled to occur in the year 2019.
Lauren Sallan is an American academic who is the head of the Macroevolution Unit at the Okinawa Institute of Science and Technology and was previously the Martin Meyerson Assistant Professor in Interdisciplinary Studies at the University of Pennsylvania. She is a paleobiologist who uses big data analytics to study macroevolution. She is a TED Senior Fellow and has two TED talks with almost three million views as of 2022.
The biogeography of Paravian dinosaurs is the study of the global distribution of Paraves through geological history. Paraves is a clade that includes all of the Theropoda that are more closely related to birds than to oviraptorosaurs. These include Dromaeosauridae and Troodontidae and Avialae. The distribution of paraves is closely related to the evolution of the clade. Understanding the changes in their distributions may shed light on problems like how and why paraves evolve, eventually gaining the ability to fly.
Caroline A. E. Strömberg is a Swedish-American paleontologist whose primary research focuses on the deep time evolution and ecology of plants through the use of the fossil record and by comparison with modern analogues, more specifically how previous plant communities changed in response to climate change and how plant evolution affected animal evolution. She is currently the Estella B. Leopold Professor of Biology and an adjunct associate professor in Earth and Space Sciences at the University of Washington and the Curator of Paleobotany at the affiliated Burke Museum of Natural History and Culture.
This list of fossil molluscs described in 2023 is a list of new taxa of fossil molluscs that were described during the year 2023, as well as other significant discoveries and events related to molluscan paleontology that occurred in 2023.
References
- 1 2 3 4 5 "William & Mary - Rowan Lockwood". William & Mary. Retrieved 2024-03-10.
- ↑ Takemura, Alison F. (July 3, 2018). "Down to Earth With: Paleobiologist Rowan Lockwood". Earth Magazine. American Geosciences Institute . Retrieved 2024-03-10.
- ↑ "Society Officers". www.paleosoc.org. Retrieved 2024-03-10.
- ↑ "Rhodes scholar opts for other award". Chicago Tribune. 1992-12-11. Retrieved 2024-03-10.
- ↑ Michaels, Jane (1988-05-29). "Rowan Lockwood's feat has her flying as high as a pterosaur". Chicago Tribune. p. 343. Retrieved 2024-03-10– via Newspapers.com.
- 1 2 3 "Rowan Lockwood". The Paleontology Portal. March 2008. Retrieved 2024-03-10.
- 1 2 Lockwood, Rowan (2001). Extinction and Rebound: Evolutionary Patterns in Late Cretaceous and Cenozoic Bivalves (Ph.D. thesis). University of Chicago. OCLC 47784038.
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