The taxonomic status of the Pliocene capybaras (Rodentia) Phugatherium Ameghino and Chapalmatherium Ameghino
Living capybaras are a unique group of rodents. They have ever-growing cheek teeth with a complicated occlusal morphology that changes even after birth. Concerning fossil capybaras this morphological change, associated with increasing size, led to regard them as taxonomically highly diverse, includi...
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2014
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00027014_v51_n3_p173_Vucetich http://hdl.handle.net/20.500.12110/paper_00027014_v51_n3_p173_Vucetich |
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paper:paper_00027014_v51_n3_p173_Vucetich2023-06-08T14:22:28Z The taxonomic status of the Pliocene capybaras (Rodentia) Phugatherium Ameghino and Chapalmatherium Ameghino Hydrochoeridae Pliocene Rodentia South America Taxonomy Living capybaras are a unique group of rodents. They have ever-growing cheek teeth with a complicated occlusal morphology that changes even after birth. Concerning fossil capybaras this morphological change, associated with increasing size, led to regard them as taxonomically highly diverse, including small species with simple dental morphology, and large species with complicated cheek teeth, considered as primitive and derived, respectively. Recently, it was proposed that the different morphs found in each locality actually represent individuals of different ontogenetic stages of a population or successive populations, rather than a multiplicity of coeval species in different stages of evolution. For the Pliocene, the richest locality for capybaras is Farola Monte Hermoso on the southern coast of Buenos Aires Province. This locality yielded four nominal species of capybaras, three of them are a small morph (Phugatherium cataclisticum Ameghino, "Anchimysops villalobosi" Kraglievich, "A. ultra" Kraglievich) and the other a large one (" Chapalmathcrium perturbidum (Ameghino)). In this paper we propose that they represent juveniles and adults of one species, P. cataclisticum. In order to evaluate the phylogenetic position of Phugatherium within Cavioidea a cladistic analysis was performed modifying a previously published combined matrix of morphology and DNA sequences. Phugathmum forms a monophyletic group and is the sister group of modern capybaras. Within Phugatherium the most basal species is P. novum Ameghino, whereas the type species P. cataclisticum is the sister group of P. saavedrai Hoffstetter, Villarroel and Rodrigo. 2014 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00027014_v51_n3_p173_Vucetich http://hdl.handle.net/20.500.12110/paper_00027014_v51_n3_p173_Vucetich |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Hydrochoeridae Pliocene Rodentia South America Taxonomy |
| spellingShingle |
Hydrochoeridae Pliocene Rodentia South America Taxonomy The taxonomic status of the Pliocene capybaras (Rodentia) Phugatherium Ameghino and Chapalmatherium Ameghino |
| topic_facet |
Hydrochoeridae Pliocene Rodentia South America Taxonomy |
| description |
Living capybaras are a unique group of rodents. They have ever-growing cheek teeth with a complicated occlusal morphology that changes even after birth. Concerning fossil capybaras this morphological change, associated with increasing size, led to regard them as taxonomically highly diverse, including small species with simple dental morphology, and large species with complicated cheek teeth, considered as primitive and derived, respectively. Recently, it was proposed that the different morphs found in each locality actually represent individuals of different ontogenetic stages of a population or successive populations, rather than a multiplicity of coeval species in different stages of evolution. For the Pliocene, the richest locality for capybaras is Farola Monte Hermoso on the southern coast of Buenos Aires Province. This locality yielded four nominal species of capybaras, three of them are a small morph (Phugatherium cataclisticum Ameghino, "Anchimysops villalobosi" Kraglievich, "A. ultra" Kraglievich) and the other a large one (" Chapalmathcrium perturbidum (Ameghino)). In this paper we propose that they represent juveniles and adults of one species, P. cataclisticum. In order to evaluate the phylogenetic position of Phugatherium within Cavioidea a cladistic analysis was performed modifying a previously published combined matrix of morphology and DNA sequences. Phugathmum forms a monophyletic group and is the sister group of modern capybaras. Within Phugatherium the most basal species is P. novum Ameghino, whereas the type species P. cataclisticum is the sister group of P. saavedrai Hoffstetter, Villarroel and Rodrigo. |
| title |
The taxonomic status of the Pliocene capybaras (Rodentia) Phugatherium Ameghino and Chapalmatherium Ameghino |
| title_short |
The taxonomic status of the Pliocene capybaras (Rodentia) Phugatherium Ameghino and Chapalmatherium Ameghino |
| title_full |
The taxonomic status of the Pliocene capybaras (Rodentia) Phugatherium Ameghino and Chapalmatherium Ameghino |
| title_fullStr |
The taxonomic status of the Pliocene capybaras (Rodentia) Phugatherium Ameghino and Chapalmatherium Ameghino |
| title_full_unstemmed |
The taxonomic status of the Pliocene capybaras (Rodentia) Phugatherium Ameghino and Chapalmatherium Ameghino |
| title_sort |
taxonomic status of the pliocene capybaras (rodentia) phugatherium ameghino and chapalmatherium ameghino |
| publishDate |
2014 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00027014_v51_n3_p173_Vucetich http://hdl.handle.net/20.500.12110/paper_00027014_v51_n3_p173_Vucetich |
| _version_ |
1768545073767645184 |