Evolution of pinnipeds
WebOrigins and evolution. Otarids, phocids and the walrus belong to a group of mammals known as pinnipeds (meaning feather-, fin- or web-footed). Pinnipeds are recognised as aquatic relatives of terrestrial members of the Order Carnivora and are thought to have diverged from an arctoid carnivore, belonging to the dog branch of Carnivorans. 2.2Evolutionary history 3Anatomy and physiology Toggle Anatomy and physiology subsection 3.1Locomotion 3.2Senses 3.3Diving adaptations 3.4Thermoregulation 3.5Sleep 4Distribution and habitat 5Behavior and life history Toggle Behavior and life history subsection 5.1Foraging and predation … See more Pinnipeds , commonly known as seals, are a widely distributed and diverse clade of carnivorous, fin-footed, semiaquatic, mostly marine mammals. They comprise the extant families Odobenidae (whose only living member is the See more Taxonomy The German naturalist Johann Karl Wilhelm Illiger was the first to recognize the pinnipeds as a distinct taxonomic unit; in 1811 he gave the name Pinnipedia to both a family and an order. American zoologist See more Living pinnipeds mainly inhabit polar and subpolar regions, particularly the North Atlantic, the North Pacific and the Southern Ocean. They are entirely absent from Indomalayan waters. Monk seals and some otariids live in tropical and subtropical waters. … See more Cultural depictions Various human cultures have for millennia depicted pinnipeds. The anthropologist, A. Asbjørn Jøn, has analysed beliefs of the Celts of Orkney and Hebrides who believed in selkies—seals that could change into humans and walk … See more The name "pinniped" derives from the Latin words pinna "fin" and pes, pedis "foot". The common name "seal" originates from the Old English word seolh, which is in turn derived from the See more Pinnipeds have streamlined, spindle-shaped bodies with reduced or non-existent external ear flaps, rounded heads, flexible necks, limbs modified into flippers, and small tails. … See more Pinnipeds have an amphibious lifestyle; they spend most of their lives in the water, but haul out to mate, raise young, molt, rest, thermoregulate or escape from aquatic predators. Several species are known to migrate vast distances, particularly in response to … See more
Evolution of pinnipeds
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WebPuijila darwini was a semi-aquatic carnivore which represents a morphological link in early pinniped evolution. Its fossil remains demonstrate the presence of enlarged, probably webbed feet, robust forelimbs and an unspecialized tail. This suggests that Puijila swam quadrupedally using its webbed fore and hind feet for propulsion. Phylogenetic studies … WebFeb 20, 2014 · Darwin's Theory of Evolution. Since there is proof of evolution, there is proof of natural selection in pinnipeds because they had to adapt to an aquatic lifestyle instead of one on land. Evidence of …
WebApr 13, 2024 · The convergent evolution of a fusiform (spindle-shaped) body shape has occurred in many aquatic vertebrates from fish to mammals, both extant and extinct … WebMillions of years ago, the ancestors of pinnipeds lived on land. These were probably weasel- or bear-like animals that spent more and more time in the ocean and eventually …
WebNov 2, 2024 · Pinnipeds -- a group including seals, sea lions and walruses -- are relatively recently derived marine mammals that evolved from terrestrial carnivorans and … WebThe oldest definitive pinniped fossils date from approximately 30.6–23 million years ago (Ma) in the North Pacific. Pinniped monophyly is consistently supported; the group …
WebMay 7, 2013 · We showed that pinniped cranial morphology is very strongly influenced by phylogenetic history, with the three pinniped families, Phocidae (seals), Otariidae (fur …
WebSep 9, 2024 · We selected three Ruminantia species, three cetacean species, three Canidae species, three pinniped species, an elephant, and a manatee. (C) … princeton high school 2022 football scheduleWebMar 14, 2024 · Here, we investigate sacrum shape evolution in pinnipeds (Carnivora: Pinnipedia) in relation to terrestrial mammalian carnivorans (fissipeds), and we include crown and stem taxa to quantify the morphological changes they experience in relation to the aquatic environment they inhabit. plu business minorWebJan 1, 2024 · Pinnipeds—fur seals and sea lions, walruses, and seals—are one of three major clades of extant marine mammals, having a fossil record going back at least to the … princeton high school adult educationWebSep 1, 1999 · In pinnipeds, there is general agreement that the distribution of key resources favors the ... princeton heritage 4050 serieshttp://www.bio.sdsu.edu/faculty/BERTA_files/Berta_2009Pinniped%20Evolution.pdf plu chamberetWebJan 29, 2014 · Pinnipeds are uniquely suited to unravel the causal relationships between SSD and harem size. Although this monophyletic group comprises only 35 extant species (Berta and Churchill 2012), these vary greatly in both SSD and the degree of polygyny.Additionally, a wealth of information is available including ecological (Caro et al. … plu bouayeWebMay 3, 2024 · The life history of pinnipeds is especially multidimensional because they are amphibious marine mammals that carry out critical life functions both on land and in the water. Their evolutionary ties to their terrestrial ancestors are demonstrated by their dependence on the sea for foraging while often breeding and giving birth on land. princeton herald princeton tx