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 inCopeia Vol. 2012; no. 4; pp. 603 - 608
Main Authors O'Leary, Maureen A, Sarr, Raphaël, Malou, Raymond, Sow, El Hadji, Lepre, Chris, Hill, Robert V
Format Journal Article
LanguageEnglish
Published 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contradicts existing hypotheses that marine amiids were generally absent after the Cretaceous–Paleogene boundary having been replaced by freshwater taxa.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.
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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CitedBy_id crossref_primary_10_1016_j_annpal_2020_102400
crossref_primary_10_1016_j_cretres_2017_04_018
crossref_primary_10_1017_jpa_2019_98
crossref_primary_10_1206_0003_0090_436_1_1
crossref_primary_10_1016_j_rmb_2015_05_003
Cites_doi 10.1002/jmor.1051630305
10.1671/0272-4634(2006)26[981:MPMPNA]2.0.CO;2
10.1080/02724634.1998.10011114
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10.1002/jmor.1050120302
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10.1111/j.1096-3642.1998.tb01299.x
10.1093/icb/22.2.275
10.2307/1445965
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  doi: 10.2307/1445965
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Snippet 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...
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jstor
fao
bioone
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StartPage 603
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
URI http://www.bioone.org/doi/abs/10.1643/CI-11-130
https://www.jstor.org/stable/41827078
https://www.proquest.com/docview/1268141956
https://search.proquest.com/docview/1268654234
Volume 2012
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