Aerugoamnis paulus, new genus and new species (anura: Anomocoela): First reported anuran from the early eocene (wasatchian) fossil butte member of the green river formation, wyoming

Five anurans have been previously reported from the Eocene Green River Formation, of which only two, a nearly complete skeleton and a tadpole, have been described. The skeleton has been identified as either Eopelobates Parker, 1929, or a pelobatid close to Eopelobates and Pelobates Wagler, 1830, but...

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Autores principales: Henrici, A.C., Báez, A.M., Grande, L.
Formato: JOUR
Materias:
Acosmanura
Amphibia
Green River Formation
North America
Pelodytidae
Pelodytomorpha
amphibian
Eocene
fossil record
new genus
new species
phylogenetics
skull
Green River
United States
Wyoming
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00974463_v81_n4_p295_Henrici
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_00974463_v81_n4_p295_Henrici2023-10-03T14:56:47Z Aerugoamnis paulus, new genus and new species (anura: Anomocoela): First reported anuran from the early eocene (wasatchian) fossil butte member of the green river formation, wyoming Henrici, A.C. Báez, A.M. Grande, L. Acosmanura Amphibia Green River Formation North America Pelodytidae Pelodytomorpha amphibian Eocene fossil record new genus new species phylogenetics skull Green River United States Wyoming Five anurans have been previously reported from the Eocene Green River Formation, of which only two, a nearly complete skeleton and a tadpole, have been described. The skeleton has been identified as either Eopelobates Parker, 1929, or a pelobatid close to Eopelobates and Pelobates Wagler, 1830, but the tadpole is indeterminate. Another specimen has been figured but not described, another is a skin impression that is probably indeterminate, and the other is presumably lost. A sixth specimen is reported here. It represents a new genus and species, Aerugoamnis paulus, which is the first anuran to be reported from the Wasatchian (early Eocene) Fossil Butte Member of the Green River Formation. It consists of a single specimen that is dorsoventrally flattened and exposed primarily in dorsal view on one slab of rock, with a poor impression of the skull and a few bone fragments representing the counterpart. The specimen is nearly complete and the bones are preserved in articulation or in close association. The presence of a spiral groove of the iliac shaft suggests affinity with Anomocoela, a hypothesis that was tested through a phylogenetic analysis including representatives of the major clades of Costata, Xenoanura, Neobatrachia, and Anomocoela. The analyzed data set consists of 66 osteological characters scored for six fossil and 20 extant taxa. Results of the analysis place Aerugoamnis as a member of the stem of Pelodytidae. This placement is based on possession of two synapomorphies: presence of a distinct otic ramus of the squamosal and the crista parotica is poorly developed. Unlike extant pelodytids, Aerugoamnis has nasals that are separated by a narrow gap, a ventral flange on the pterygoid, and unfused tibiale and fibulare. Prior to the discovery of Aerugoamnis, fragmentary remains from the middle Eocene of Europe, the earliest of which are Lutetian (MP 13), have been questionably referred to the family. Aerugoamnis now is the earliest known occurrence of the anomocoelan lineage represented today by Pelodytidae. Fil:Báez, A.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00974463_v81_n4_p295_Henrici
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Acosmanura
Amphibia
Green River Formation
North America
Pelodytidae
Pelodytomorpha
amphibian
Eocene
fossil record
new genus
new species
phylogenetics
skull
Green River
United States
Wyoming
spellingShingle Acosmanura
Amphibia
Green River Formation
North America
Pelodytidae
Pelodytomorpha
amphibian
Eocene
fossil record
new genus
new species
phylogenetics
skull
Green River
United States
Wyoming
Henrici, A.C.
Báez, A.M.
Grande, L.
Aerugoamnis paulus, new genus and new species (anura: Anomocoela): First reported anuran from the early eocene (wasatchian) fossil butte member of the green river formation, wyoming
topic_facet Acosmanura
Amphibia
Green River Formation
North America
Pelodytidae
Pelodytomorpha
amphibian
Eocene
fossil record
new genus
new species
phylogenetics
skull
Green River
United States
Wyoming
description Five anurans have been previously reported from the Eocene Green River Formation, of which only two, a nearly complete skeleton and a tadpole, have been described. The skeleton has been identified as either Eopelobates Parker, 1929, or a pelobatid close to Eopelobates and Pelobates Wagler, 1830, but the tadpole is indeterminate. Another specimen has been figured but not described, another is a skin impression that is probably indeterminate, and the other is presumably lost. A sixth specimen is reported here. It represents a new genus and species, Aerugoamnis paulus, which is the first anuran to be reported from the Wasatchian (early Eocene) Fossil Butte Member of the Green River Formation. It consists of a single specimen that is dorsoventrally flattened and exposed primarily in dorsal view on one slab of rock, with a poor impression of the skull and a few bone fragments representing the counterpart. The specimen is nearly complete and the bones are preserved in articulation or in close association. The presence of a spiral groove of the iliac shaft suggests affinity with Anomocoela, a hypothesis that was tested through a phylogenetic analysis including representatives of the major clades of Costata, Xenoanura, Neobatrachia, and Anomocoela. The analyzed data set consists of 66 osteological characters scored for six fossil and 20 extant taxa. Results of the analysis place Aerugoamnis as a member of the stem of Pelodytidae. This placement is based on possession of two synapomorphies: presence of a distinct otic ramus of the squamosal and the crista parotica is poorly developed. Unlike extant pelodytids, Aerugoamnis has nasals that are separated by a narrow gap, a ventral flange on the pterygoid, and unfused tibiale and fibulare. Prior to the discovery of Aerugoamnis, fragmentary remains from the middle Eocene of Europe, the earliest of which are Lutetian (MP 13), have been questionably referred to the family. Aerugoamnis now is the earliest known occurrence of the anomocoelan lineage represented today by Pelodytidae.
format JOUR
author Henrici, A.C.
Báez, A.M.
Grande, L.
author_facet Henrici, A.C.
Báez, A.M.
Grande, L.
author_sort Henrici, A.C.
title Aerugoamnis paulus, new genus and new species (anura: Anomocoela): First reported anuran from the early eocene (wasatchian) fossil butte member of the green river formation, wyoming
title_short Aerugoamnis paulus, new genus and new species (anura: Anomocoela): First reported anuran from the early eocene (wasatchian) fossil butte member of the green river formation, wyoming
title_full Aerugoamnis paulus, new genus and new species (anura: Anomocoela): First reported anuran from the early eocene (wasatchian) fossil butte member of the green river formation, wyoming
title_fullStr Aerugoamnis paulus, new genus and new species (anura: Anomocoela): First reported anuran from the early eocene (wasatchian) fossil butte member of the green river formation, wyoming
title_full_unstemmed Aerugoamnis paulus, new genus and new species (anura: Anomocoela): First reported anuran from the early eocene (wasatchian) fossil butte member of the green river formation, wyoming
title_sort aerugoamnis paulus, new genus and new species (anura: anomocoela): first reported anuran from the early eocene (wasatchian) fossil butte member of the green river formation, wyoming
url http://hdl.handle.net/20.500.12110/paper_00974463_v81_n4_p295_Henrici
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AT baezam aerugoamnispaulusnewgenusandnewspeciesanuraanomocoelafirstreportedanuranfromtheearlyeocenewasatchianfossilbuttememberofthegreenriverformationwyoming
AT grandel aerugoamnispaulusnewgenusandnewspeciesanuraanomocoelafirstreportedanuranfromtheearlyeocenewasatchianfossilbuttememberofthegreenriverformationwyoming
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