{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,8]],"date-time":"2026-10-08T03:02:37Z","timestamp":1791428557202,"version":"4.3.3"},"reference-count":147,"publisher":"Oxford University Press (OUP)","issue":"2","license":[{"start":{"date-parts":[[2021,4,21]],"date-time":"2021-04-21T00:00:00Z","timestamp":1618963200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/academic.oup.com\/journals\/pages\/open_access\/funder_policies\/chorus\/standard_publication_model"}],"funder":[{"DOI":"10.13039\/100000006","name":"Office of Naval Research","doi-asserted-by":"publisher","award":["N000141410533"],"award-info":[{"award-number":["N000141410533"]}],"id":[{"id":"10.13039\/100000006","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100014378","name":"Canadian Museum of Nature","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100014378","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2021,9,8]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Secondary aquatic vertebrates exhibit a diversity of swimming modes that use paired limbs and\/or the tail. Various secondarily aquatic tetrapod clades, including amphibians, reptiles, and mammals use transverse undulations or oscillations of the tail for swimming. These movements have often been classified according to a kinematic gradient that was established for fishes but may not be appropriate to describe the swimming motions of tetrapods. To understand the evolution of movements and design of the tail in aquatic tetrapods, we categorize the types of tails used for swimming and examine swimming kinematics and hydrodynamics. From a foundation of a narrow, elongate ancestral tail, the tails used for swimming by aquatic tetrapods are classified as tapered, keeled, paddle, and lunate. Tail undulations are associated with tapered, keeled, and paddle tails for a diversity of taxa. Propulsive undulatory waves move down the tail with increasing amplitude toward the tail tip, while moving posteriorly at a velocity faster than the anterior motion of the body indicating that the tail is used for thrust generation. Aquatic propulsion is associated with the transfer of momentum to the water from the swimming movements of the tail, particularly at the trailing edge. The addition of transverse extensions and flattening of the tail increases the mass of water accelerated posteriorly and affects vorticity shed into the wake for more aquatically adapted animals. Digital Particle Image Velocimetry reveals that the differences were exhibited in the vortex wake between the morphological and kinematic extremes of the alligator with a tapering undulating tail and the dolphin with oscillating wing-like flukes that generate thrust. In addition to exploring the relationship between the shape of undulating tails and the swimming performance across aquatic tetrapods, the role of tail reduction or loss of a tail in aquatic-tetrapod swimming was also explored. For aquatic tetrapods, the reduction would have been due to factors including locomotor and defensive specializations and phylogenetic and physiological constraints. Possession of a thrust-generating tail for swimming, or lack thereof, guided various lineages of secondarily aquatic vertebrates into different evolutionary trajectories for effective aquatic propulsion (i.e., speed, efficiency, and acceleration).<\/jats:p>","DOI":"10.1093\/icb\/icab021","type":"journal-article","created":{"date-parts":[[2021,4,19]],"date-time":"2021-04-19T21:29:29Z","timestamp":1618867769000},"page":"398-413","source":"Crossref","is-referenced-by-count":31,"title":["The Role of the Tail or Lack Thereof in the Evolution of Tetrapod Aquatic Propulsion"],"prefix":"10.1093","volume":"61","author":[{"given":"Frank E","family":"Fish","sequence":"first","affiliation":[{"name":"Department of Biology, West Chester University, West Chester, PA 19383, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Natalia","family":"Rybczynski","sequence":"additional","affiliation":[{"name":"Department of Palaeobiology, Canadian Museum of Nature, Ottawa, ON, Canada K1P 6P4"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"George V","family":"Lauder","sequence":"additional","affiliation":[{"name":"Museum of Comparative Zoology, Harvard University, Cambridge, MA 02138, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christina M","family":"Duff","sequence":"additional","affiliation":[{"name":"Department of Biology, West Chester University, West Chester, PA 19383, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2021,5,9]]},"reference":[{"key":"2022050900052778300_icab021-B1","first-page":"301","volume-title":"Animal mechanics","author":"Alexander","year":"1983"},{"key":"2022050900052778300_icab021-B2","doi-asserted-by":"crossref","first-page":"907","DOI":"10.1093\/biolinnean\/blx026","article-title":"Diversification patterns and size evolution in caviomorph rodents","volume":"121","author":"\u00c1lvarez","year":"2017","journal-title":"Biol J Linn 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Mech"},{"key":"2022050900052778300_icab021-B41","doi-asserted-by":"crossref","first-page":"114","DOI":"10.1511\/2013.101.114","article-title":"Not just going with the flow","volume":"101","author":"Fish","year":"2013","journal-title":"Am Sci"},{"key":"2022050900052778300_icab021-B42","doi-asserted-by":"crossref","first-page":"252","DOI":"10.1242\/jeb.087924","article-title":"Measurement of hydrodynamic force generation by swimming dolphins using bubble DPIV","volume":"217","author":"Fish","year":"2014","journal-title":"J Exp Biol"},{"key":"2022050900052778300_icab021-B43","doi-asserted-by":"crossref","first-page":"33","DOI":"10.3390\/fluids3020033","article-title":"Experimental measurement of dolphin thrust generated during a tail stand using DPIV","volume":"3","author":"Fish","year":"2018","journal-title":"Fluids"},{"key":"2022050900052778300_icab021-B44","doi-asserted-by":"crossref","first-page":"226","DOI":"10.1038\/028226g0","article-title":"On whales, past and present, and their probable origin","volume":"28","author":"Flower","year":"1883","journal-title":"Nature"},{"key":"2022050900052778300_icab021-B45","doi-asserted-by":"crossref","first-page":"368","DOI":"10.1515\/9781400862924.368","volume-title":"Eocene\u2013oligocene climatic and biotic evolution","author":"Fordyce","year":"1992"},{"key":"2022050900052778300_icab021-B46","doi-asserted-by":"crossref","first-page":"107","DOI":"10.1242\/jeb.162.1.107","article-title":"Kinematic and electromyographic analysis of the functional role of the body axis during terrestrial and aquatic locomotion in the salamander Ambystoma tigrinum","volume":"162","author":"Frolich","year":"1992","journal-title":"J Exp Biol"},{"key":"2022050900052778300_icab021-B47","doi-asserted-by":"crossref","first-page":"92","DOI":"10.1111\/j.1558-5646.1966.tb03345.x","article-title":"On the origin of the jumping mechanism of 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the Eocene of Pakistan and the origin of cetacean swimming","volume":"268","author":"Gingerich","year":"1994","journal-title":"Science"},{"key":"2022050900052778300_icab021-B52","doi-asserted-by":"crossref","first-page":"jeb138438","DOI":"10.1242\/jeb.138438","article-title":"Robotics-inspired biology","volume":"221","author":"Gravish","year":"2018","journal-title":"J Exp Biol"},{"key":"2022050900052778300_icab021-B53","first-page":"165","article-title":"Konstruktionszw\u00e4nge in der Evolution: schwimmende Vierf\u00fcsser","volume":"124","author":"Gutmann","year":"1994","journal-title":"Natur Mus"},{"key":"2022050900052778300_icab021-B54","first-page":"1","article-title":"Ecology and behavior of the manatee (Trichechus manatus) in Florida","volume":"5","author":"Hartman","year":"1979","journal-title":"Spec Pub Am Soc Mamm"},{"key":"2022050900052778300_icab021-B55","doi-asserted-by":"crossref","first-page":"296","DOI":"10.1016\/j.tree.2011.12.003","article-title":"From extant to extinct: locomotor ontogeny and the evolution of flight","volume":"27","author":"Heers","year":"2012","journal-title":"Trends Ecol Evol"},{"key":"2022050900052778300_icab021-B56","doi-asserted-by":"crossref","first-page":"143","DOI":"10.1111\/j.1365-2907.1979.tb00252.x","article-title":"The mammalian tail: a review of functions","volume":"9","author":"Hickman","year":"1979","journal-title":"Mamm Rev"},{"key":"2022050900052778300_icab021-B57","first-page":"657","volume-title":"Analysis of vertebrate structure","author":"Hildebrand","year":"1995"},{"key":"2022050900052778300_icab021-B58","volume-title":"Aquatic mammals","author":"Howell","year":"1930"},{"key":"2022050900052778300_icab021-B59","doi-asserted-by":"crossref","first-page":"217","DOI":"10.2307\/1374471","article-title":"The swimming mechanism of the platypus","volume":"18","author":"Howell","year":"1937","journal-title":"J Mamm"},{"key":"2022050900052778300_icab021-B60","doi-asserted-by":"crossref","first-page":"333","DOI":"10.1086\/physzool.61.4.30161251","article-title":"Penguin swimming. I. Hydrodynamics","volume":"61","author":"Hui","year":"1988","journal-title":"Physiol Zool"},{"key":"2022050900052778300_icab021-B61","doi-asserted-by":"crossref","first-page":"67","DOI":"10.1038\/s41586-020-2190-3","article-title":"Tail-propelled aquatic locomotion in a theropod dinosaur","volume":"581","author":"Ibrahim","year":"2020","journal-title":"Nature"},{"key":"2022050900052778300_icab021-B62","doi-asserted-by":"crossref","first-page":"835","DOI":"10.2307\/1440687","article-title":"On the terrestrial origin of frogs","volume":"1962","author":"Inger","year":"1962","journal-title":"Copiea"},{"key":"2022050900052778300_icab021-B63","doi-asserted-by":"crossref","first-page":"195","DOI":"10.2307\/1444809","article-title":"Swimming in constricting (Elaphe g. guttata) and nonconstricting (Nerodia fasciata pictiventris) colubrid snakes","volume":"1985","author":"Jayne","year":"1985","journal-title":"Copeia"},{"key":"2022050900052778300_icab021-B64","doi-asserted-by":"crossref","first-page":"1123","DOI":"10.1126\/science.1123026","article-title":"A swimming mammaliaform from the Middle Jurassic and ecomorphological diversification of early mammals","volume":"311","author":"Ji","year":"2006","journal-title":"Science"},{"key":"2022050900052778300_icab021-B65","first-page":"790","volume-title":"Vertebrates: comparative anatomy, function, evolution","author":"Kardong","year":"2019"},{"key":"2022050900052778300_icab021-B66","doi-asserted-by":"crossref","first-page":"1","DOI":"10.3996\/nafa.68.0001","article-title":"The sea otter in the eastern Pacific Ocean","volume":"68","author":"Kenyon","year":"1969","journal-title":"N Am Fauna"},{"key":"2022050900052778300_icab021-B67","doi-asserted-by":"crossref","first-page":"2411","DOI":"10.1242\/jeb.02790","article-title":"Swimming kinematics of the Florida manatee (Trichechus manatus latirostris): hydrodynamic analysis of an undulatory mammalian swimmer","volume":"210","author":"Kojeszewski","year":"2007","journal-title":"J Exp Biol"},{"key":"2022050900052778300_icab021-B68","doi-asserted-by":"crossref","first-page":"143","DOI":"10.3354\/ab00176","article-title":"Infrared thermography of the body surface in the Eurasian otter Lutra lutra and giant otter Pteronura brasiliensis","volume":"6","author":"Kuhn","year":"2009","journal-title":"Aquat Biol"},{"key":"2022050900052778300_icab021-B69","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1186\/2041-9139-3-12","article-title":"The middle Cambrian fossil Pikaia and the evolution of chordate swimming","volume":"3","author":"Lacalli","year":"2012","journal-title":"EvoDevo"},{"key":"2022050900052778300_icab021-B70","doi-asserted-by":"crossref","first-page":"390","DOI":"10.2307\/3625819","article-title":"A survey of the fossil vertebrates of Kansas: Part IV: birds","volume":"49","author":"Lane","year":"1947","journal-title":"Trans Kansas Acad Sci"},{"key":"2022050900052778300_icab021-B71","first-page":"101","article-title":"Function of the caudal fin during locomotion in fishes: kinematics, flow visualization and evolutionary patterns","volume":"40","author":"Lauder","year":"2000","journal-title":"Am Zool"},{"key":"2022050900052778300_icab021-B72","doi-asserted-by":"crossref","first-page":"476","DOI":"10.1038\/s41586-018-0419-1","article-title":"A Triassic stem turtle with an edentulous beak","volume":"560","author":"Li","year":"2018","journal-title":"Nature"},{"key":"2022050900052778300_icab021-B73","first-page":"784","volume-title":"Functional anatomy of the vertebrates: an evolutionary perspective","author":"Liem","year":"2001"},{"key":"2022050900052778300_icab021-B74","doi-asserted-by":"crossref","first-page":"413","DOI":"10.1146\/annurev.fl.01.010169.002213","article-title":"Hydrodynamics of aquatic animal propulsion\u2014a 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