Bibliography Record
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Barnes, Lawrence G.
(detail)
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2013 |
A new genus and species of Late Miocene paleoparadoxiid (Mammalia, Desmostylia) from California.
Nat. Hist. Museum of Los Angeles County Contributions in Science 521: 51-114. 7 tabs. 39 figs. Sept. 11, 2013.
–ABSTRACT: The Desmostylia are an extinct order of quadrupedal, marine, herbivorous, placental mammals whose closest living relatives are Proboscidea (elephants and their relatives) and Sirenia (sea cows and manatees). Desmostylians lived around the margins of the North Pacific Ocean from the Oligocene until the end of the Miocene. A 10- to 11-million-year-old fossil skeleton, here named Neoparadoxia cecilialina, new genus and new species, was found in the early late Miocene part of the Monterey Formation in Orange County, coastal southern California, USA. This is the geochronologically youngest named species of desmostylian. The holotype of this species is the most complete known paleoparadoxiid desmostylian skeleton and only the second desmostylian skeleton yet reported from North America that includes a cranium. The skeleton is exhibited in the Age of Mammals hall of the Natural History Museum of Los Angeles County. Among previously named desmostylians, N. cecilialina is most closely related to middle Miocene (approximately 14-million-year-old) Paleoparadoxia repenningi Domning and Barnes, 2007. The two species share sufficient numbers of characters to warrant transferring P. repenningi to the new genus Neoparadoxia. These species demonstrate that geochronologically late paleoparadoxiids evolved enhanced adaptations for life in water (larger body size, larger manus and pes, enlarged external nares, elevated orbits) and other adaptations related to bulk aquatic feeding (enlarged oral cavity, ventrally turned snout and anterior end of the mandible, larger molars). Neoparadoxia cecilialina has incisors that are flatter and wider than those of any other known desmostylian. Other derived features of N. cecilialina, such as delayed eruption of canines and posterior-most molars, possibly extended its life span, with a result being larger adult body size. Such adaptations in the last known desmostylians may have been responses to competition with dugongid sirenians, also herbivores, that appeared in the North Pacific Ocean after the earlier endemic desmostylians and ultimately supplanted them in that realm. The comparatively small and primitive species, Paleoparadoxia weltoni Clark, 1991, from the latest Oligocene Skooner Gulch Formation in Mendocino County, California, USA, is assigned to the new genus Archaeoparadoxia.
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Related Index Records (19)
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Behemotops Domning, Ray, and McKenna, 1986
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2013 |
Barnes, L.G. |
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Behemotops emlongi Domning, Ray, and McKenna, 1986
(= Behemotops proteus)
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2013 |
Barnes, L.G. |
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Behemotops katsuiei Inuzuka, 2000
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2013 |
Barnes, L.G. |
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Behemotops proteus Domning, Ray, and McKenna, 1986
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2013 |
Barnes, L.G. |
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California
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2013 |
Barnes, L.G. (Neoparadoxia cecilialina, n.gen.n.sp.; Late Mioc., Orange Co.) |
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Miocene
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2013 |
Barnes, L.G. (Neoparadoxia cecilialina, n.gen.n.sp.; Late Mioc., Orange Co., California) |
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Paleoparadoxia Reinhart, 1959
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2013 |
Barnes, L.G. |
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Paleoparadoxia tabatai (Tokunaga, 1939) Reinhart, 1959
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2013 |
Barnes, L.G. |
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Paleoparadoxia weltoni Clark, 1991
(= Archaeoparadoxia weltoni)
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2013 |
Barnes, L.G. (referred to Archaeoparadoxia) |
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Paleoparadoxiidae Reinhart, 1959
(family)
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2013 |
Barnes, L.G. |
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Behemotopsinae (Inuzuka, 1987) Barnes, 2013
(subfamily)
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2013 |
Barnes, L.G. (new rank) |
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Paleoparadoxiinae (Reinhart, 1959) Barnes, 2013
(subfamily)
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2013 |
Barnes, L.G. (new subfamily) |
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Archaeoparadoxia Barnes, 2013
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2013 |
Barnes, L.G. (new genus) |
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Archaeoparadoxia weltoni Barnes, 2013
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2013 |
Barnes, L.G. (n.comb.) |
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Neoparadoxia Barnes, 2013
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2013 |
Barnes, L.G. (new genus) |
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Neoparadoxia cecilialina Barnes, 2013
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2013 |
Barnes, L.G. (n.gen.n.sp.; Late Mioc., Orange Co., California) |
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Neoparadoxia repenningi (Domning and Barnes, 2007) Barnes, 2013
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2013 |
Barnes, L.G. (n.comb.) |
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Paleoparadoxia media Inuzuka, 2005
(= Paleoparadoxia tabatai)
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2013 |
Barnes, L.G. |
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Paleoparadoxia repenningi Domning & Barnes, 2007
(= Neoparadoxia repenningi)
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2013 |
Barnes, L.G. (referred to Neoparadoxia) |
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