A New Fossil Amiid from the Eocene of Senegal and the Persistence of Extinct Marine Amiids after the Cretaceous–Paleogene Boundary
We report a new fossil amiid from Eocene rocks of West Africa representing the first record of this clade from Senegal. The new specimen has a maxilla that is very similar in size to that of Amia calva. It is distinctly smaller than reported remains of another West African Eocene taxon, †Maliamia gi...
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Published in | Copeia Vol. 2012; no. 4; pp. 603 - 608 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
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810 East 10th Street, P.O. Box 1897, Lawrence, Kansas 66044
The American Society of Ichthyologists and Herpetologists
18.12.2012
American Society of Ichthyologists and Herpetologists |
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Abstract | We report a new fossil amiid from Eocene rocks of West Africa representing the first record of this clade from Senegal. The new specimen has a maxilla that is very similar in size to that of Amia calva. It is distinctly smaller than reported remains of another West African Eocene taxon, †Maliamia gigas. We tentatively refer the Senegal specimen to Vidalamiini because it has the large postmaxillary process diagnostic of this clade; however, it also exhibits anatomical features not previously described in extinct amiids. We recovered the specimen in rocks of the Lam-Lam Formation in Central-Western Senegal that we interpret to have been a shallow marine depositional environment. The occurrence of an Eocene marine amiid contradicts existing hypotheses that marine amiids were generally absent after the Cretaceous–Paleogene boundary having been replaced by freshwater taxa. Research completed since the initial discovery of †Maliamia gigas indicates that this Eocene taxon was also found in shallow marine rocks. Nous avons découvert un poisson fossile dans les sédiments éocènes de l'Afrique de l'Ouest, le premier représentant du clade des Amiidae au Sénégal. Le nouveau fossile a presque la même taille que l'espèce actuelle, Amia calva. Le fossile sénégalais a une longue processus postmaxillaire diagnostique de Vidalamiini. Le fossile montre aussi plusieurs charactéristiques anatomiques qui n'ont jamais été décrites chez les Amiidés fossiles. Nous avons trouvé le fossile dans les sédiments de la Formation du Lam-Lam au Centre-Ouest du Sénégal, et nous les interprétons comme des sédiments marins. La découverte d'un amiidé dans les gisements éocènes marins contredit l'hypothèse selon laquelle on ne trouve plus d'amiidés marins au-dessus de la limite Crétacé–Paléogène et qu'ils ont été remplacés par les amiidés d'eau douce. Les travaux stratigraphiques menés depuis la découverte de †Maliamia gigas ont montré que cette espèce était aussi présente dans les gisements marins. |
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AbstractList | We report a new fossil amiid from Eocene rocks of West Africa representing the first record of this clade from Senegal. The new specimen has a maxilla that is very similar in size to that of Amia calva. It is distinctly smaller than reported remains of another West African Eocene taxon, [dagger]Maliamia gigas. We tentatively refer the Senegal specimen to Vidalamiini because it has the large postmaxillary process diagnostic of this clade; however, it also exhibits anatomical features not previously described in extinct amiids. We recovered the specimen in rocks of the Lam-Lam Formation in Central-Western Senegal that we interpret to have been a shallow marine depositional environment. The occurrence of an Eocene marine amiid contradicts existing hypotheses that marine amiids were generally absent after the Cretaceous-Paleogene boundary having been replaced by freshwater taxa. Research completed since the initial discovery of [dagger]Maliamia gigas indicates that this Eocene taxon was also found in shallow marine rocks. [PUBLICATION ABSTRACT] We report a new fossil amiid from Eocene rocks of West Africa representing the first record of this clade from Senegal. The new specimen has a maxilla that is very similar in size to that of Amia calva. It is distinctly smaller than reported remains of another West African Eocene taxon, Maliamia gigas. We tentatively refer the Senegal specimen to Vidalamiini because it has the large postmaxillary process diagnostic of this clade; however, it also exhibits anatomical features not previously described in extinct amiids. We recovered the specimen in rocks of the Lam-Lam Formation in Central-Western Senegal that we interpret to have been a shallow marine depositional environment. The occurrence of an Eocene marine amiid contradicts existing hypotheses that marine amiids were generally absent after the Cretaceous-Paleogene boundary having been replaced by freshwater taxa. Research completed since the initial discovery of fMaliamia gigas indicates that this Eocene taxon was also found in shallow marine rocks. Nous avons découvert un poisson fossile dans les sédiments éocènes de l'Afrique de l'Ouest, le premier représentant du clade des Amiidae au Sénégal. Le nouveau fossile a presque la même taille que l'espèce actuelle, Amia calva. Le fossile sénégalais a une longue processus postmaxillaire diagnostique de Vidalamiini. Le fossile montre aussi plusieurs charactéristiques anatomiques qui n'ont jamais été décrites chez les Amiidés fossiles. Nous avons trouvé le fossile dans les sédiments de la Formation du Lam-Lam au Centre-Ouest du Sénégal, et nous les interprétons comme des sédiments marins. La découverte d'un amiidé dans les gisements éocènes marins contredit l'hypothèse selon laquelle on ne trouve plus d'amiidés marins au-dessus de la limite Crétacé-Paléogène et qu'ils ont été remplacés par les amiidés d'eau douce. Les travaux stratigraphiques menés depuis la découverte de Maliamia gigas ont montré que cette espèce était aussi présente dans les gisements marins. We report a new fossil amiid from Eocene rocks of West Africa representing the first record of this clade from Senegal. The new specimen has a maxilla that is very similar in size to that of Amia calva. It is distinctly smaller than reported remains of another West African Eocene taxon, †Maliamia gigas. We tentatively refer the Senegal specimen to Vidalamiini because it has the large postmaxillary process diagnostic of this clade; however, it also exhibits anatomical features not previously described in extinct amiids. We recovered the specimen in rocks of the Lam-Lam Formation in Central-Western Senegal that we interpret to have been a shallow marine depositional environment. The occurrence of an Eocene marine amiid contradicts existing hypotheses that marine amiids were generally absent after the Cretaceous–Paleogene boundary having been replaced by freshwater taxa. Research completed since the initial discovery of †Maliamia gigas indicates that this Eocene taxon was also found in shallow marine rocks. Nous avons découvert un poisson fossile dans les sédiments éocènes de l'Afrique de l'Ouest, le premier représentant du clade des Amiidae au Sénégal. Le nouveau fossile a presque la même taille que l'espèce actuelle, Amia calva. Le fossile sénégalais a une longue processus postmaxillaire diagnostique de Vidalamiini. Le fossile montre aussi plusieurs charactéristiques anatomiques qui n'ont jamais été décrites chez les Amiidés fossiles. Nous avons trouvé le fossile dans les sédiments de la Formation du Lam-Lam au Centre-Ouest du Sénégal, et nous les interprétons comme des sédiments marins. La découverte d'un amiidé dans les gisements éocènes marins contredit l'hypothèse selon laquelle on ne trouve plus d'amiidés marins au-dessus de la limite Crétacé–Paléogène et qu'ils ont été remplacés par les amiidés d'eau douce. Les travaux stratigraphiques menés depuis la découverte de †Maliamia gigas ont montré que cette espèce était aussi présente dans les gisements marins. We report a new fossil amiid from Eocene rocks of West Africa representing the first record of this clade from Senegal. The new specimen has a maxilla that is very similar in size to that of Amia calva. It is distinctly smaller than reported remains of another West African Eocene taxon, Maliamia gigas. We tentatively refer the Senegal specimen to Vidalamiini because it has the large postmaxillary process diagnostic of this clade; however, it also exhibits anatomical features not previously described in extinct amiids. We recovered the specimen in rocks of the Lam-Lam Formation in Central-Western Senegal that we interpret to have been a shallow marine depositional environment. The occurrence of an Eocene marine amiid contradicts existing hypotheses that marine amiids were generally absent after the Cretaceous-Paleogene boundary having been replaced by freshwater taxa. Research completed since the initial discovery of Maliamia gigas indicates that this Eocene taxon was also found in shallow marine rocks. |
Author | O'Leary, Maureen A Malou, Raymond Hill, Robert V Sarr, Raphaël Lepre, Chris Sow, El Hadji |
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Cites_doi | 10.1002/jmor.1051630305 10.1671/0272-4634(2006)26[981:MPMPNA]2.0.CO;2 10.1080/02724634.1998.10011114 10.2110/palo.2006.p06-113r 10.1002/jmor.1050120302 10.1206/598.1 10.1669/0883-1351(2004)019<0565:BBIPCA>2.0.CO;2 10.1111/j.1096-3642.1998.tb01299.x 10.1093/icb/22.2.275 10.2307/1445965 |
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References_xml | – volume-title: Le Continental Terminal et le Pléistocène ancien du bassin sénégalo-mauritanien. Stratigraphie, sédimentation, diagenèse, altérations. Reconstitution des paléorivages au travers des cuirasses year: 1985 ident: i0045-8511-2012-4-603-Lappartient1 contributor: fullname: Lappartient J. R – ident: i0045-8511-2012-4-603-Lauder1 doi: 10.1002/jmor.1051630305 – volume: 26 start-page: 981 year: 2006 ident: i0045-8511-2012-4-603-OLeary1 publication-title: Journal of Vertebrate Paleontology doi: 10.1671/0272-4634(2006)26[981:MPMPNA]2.0.CO;2 contributor: fullname: O'Leary M. A – volume: 43 start-page: 1 year: 1966 ident: i0045-8511-2012-4-603-Monciardini1 publication-title: Mémoire du Bureau de Recherches géologiques et Minières contributor: fullname: Monciardini C – ident: i0045-8511-2012-4-603-Grande1 doi: 10.1080/02724634.1998.10011114 – volume: 23 start-page: 139 year: 2008 ident: i0045-8511-2012-4-603-Tapanila2 publication-title: Palaios doi: 10.2110/palo.2006.p06-113r contributor: fullname: Tapanila L – volume: 83 start-page: 16 year: 1971 ident: i0045-8511-2012-4-603-Casier1 publication-title: Revue de Zoologie et de Botanique Africaines, Bruxelles contributor: fullname: Casier E – volume: 109 start-page: 8 year: 1966 ident: i0045-8511-2012-4-603-louard1 publication-title: Notes Africaines contributor: fullname: Élouard P – volume-title: Étude biostratigraphique et paléoenvironnementale des séries d'âge Crétacé terminal à Eocène moyen du Sénégal occidental. Systématique et migration des ostracodes year: 1995 ident: i0045-8511-2012-4-603-Sarr1 contributor: fullname: Sarr R – ident: i0045-8511-2012-4-603-Allis1 doi: 10.1002/jmor.1050120302 – volume: 3631 start-page: 1 year: 2008 ident: i0045-8511-2012-4-603-Hill1 publication-title: American Museum Novitates doi: 10.1206/598.1 contributor: fullname: Hill R. V – volume: 14 start-page: 1 year: 1952 ident: i0045-8511-2012-4-603-Tessier1 publication-title: Bulletin de la Direction des Mines de l'Afrique Occidentale Française, Dakar contributor: fullname: Tessier F – volume: 19 start-page: 565 year: 2004 ident: i0045-8511-2012-4-603-Tapanila1 publication-title: Palaios doi: 10.1669/0883-1351(2004)019<0565:BBIPCA>2.0.CO;2 contributor: fullname: Tapanila L – ident: i0045-8511-2012-4-603-Forey1 doi: 10.1111/j.1096-3642.1998.tb01299.x – volume: 17 start-page: 1 year: 1963 ident: i0045-8511-2012-4-603-Freneix1 publication-title: Mémoires du Bureau de Recherches Géologiques et Minières contributor: fullname: Freneix S – volume: 22 start-page: 275 year: 1982 ident: i0045-8511-2012-4-603-Lauder2 publication-title: American Zoologist doi: 10.1093/icb/22.2.275 contributor: fullname: Lauder G. V – volume: 8 start-page: 1 year: 1975 ident: i0045-8511-2012-4-603-Tessier2 publication-title: Travaux des Laboratoires des Sciences de la Terre, Saint-Jérôme, Marseille, Série A contributor: fullname: Tessier F – ident: i0045-8511-2012-4-603-Patterson1 doi: 10.2307/1445965 |
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SubjectTerms | Amia calva Anatomy Bones Evolution Fossils Fresh water Geography Geology Hypotheses Maxilla Paleogene period Rocks Stone Taxa Water wells |
Title | A New Fossil Amiid from the Eocene of Senegal and the Persistence of Extinct Marine Amiids after the Cretaceous–Paleogene Boundary |
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