A new bizarre armadillo (Mammalia, Xenarthra, Dasypodidae) from the late Miocene of Ecuador

The Dasypodidae (Astegotheriinae, Stegotheriinae and Dasypodinae), constitute the sister group of the remaining diversity of "armadillos" (Chlamyphoridae), and the most ancient group within Xenarthra, with a divergence estimated in ca. 40 Ma. Among Dasypodidae, only Dasypodinae has l...

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Autores principales: Barasoain, Darío Daniel, Román Carrión, José Luis, Zurita, Alfredo Eduardo, Miño Boilini, Ángel Ramón
Formato: Reunión
Lenguaje:Inglés
Publicado: Asociación Paleontológica Argentina 2024
Materias:
Armadillo
Mioceno tardío
Ecuador
Acceso en línea:http://repositorio.unne.edu.ar/handle/123456789/54533
Aporte de:
RIUNNE - Repositorio Institucional de la Universidad Nacional del Nordeste (UNNE) de Universidad Nacional del Nordeste
id I48-R184-123456789-54533
record_format dspace
spelling I48-R184-123456789-545332025-03-06T11:29:05Z A new bizarre armadillo (Mammalia, Xenarthra, Dasypodidae) from the late Miocene of Ecuador Barasoain, Darío Daniel Román Carrión, José Luis Zurita, Alfredo Eduardo Miño Boilini, Ángel Ramón Armadillo Mioceno tardío Ecuador The Dasypodidae (Astegotheriinae, Stegotheriinae and Dasypodinae), constitute the sister group of the remaining diversity of "armadillos" (Chlamyphoridae), and the most ancient group within Xenarthra, with a divergence estimated in ca. 40 Ma. Among Dasypodidae, only Dasypodinae has living representatives, including over 8 species of Dasypus. Dasypodinae armadillos have their oldest records coming from the middle Miocene of La Venta (Colombia), and become relatively abundant at lower latitudes in South America during the Miocene. Recognized taxa for this lapse include Plesiodasypus colombianus (La Victoria Formation, ca. 13 Ma) and Anadasypus hondanus (Villavieja Formation, ca. 12 Ma) for the middle Miocene of La Venta, Colombia, and Anadasypus aequatorianus (Letrero Formation, ca. 11.2-9 Ma) for the late Miocene of Nabón, Ecuador. Here, we report a new and bizarre armadillo exhumed from the Letrero Formation levels outcropping at Nabón basin, southern Ecuador. Materials (EPNPv-6381) are housed in the Colección de Paleontología, Escuela Politécnica Nacional (Quito, Ecuador), and include several fixed and mobile osteoderms of the dorsal carapace belonging to a single individual, which was found partially articulated in the field. The presence of enlarged mobile osteoderms with a very developed articular portion and a clear dasypodine-like ornamentation pattern (shared by all dasypodine armadillos) on their exposed surface allow to include it within Dasypodidae Dasypodinae. In turn, the presence of fixed osteoderms with a rectangular outline, and an ornamentation pattern composed of an elongated and keeled central figure surrounded by minor peripheral figures allow its inclusion within Plesiodasypus. This new taxon is supported by some unusual features that represent solid autapomorphic characters, being the most relevant: 1) denticulated lateral edges in fixed osteoderms and the articular portions of mobile osteoderms, and 2) very large foramina along the main sulcus that delimitates the central figure of mobile osteoderms, tentatively interpreted as a complex glandular system restricted to mobile osteoderms, though a certain degree of associated pilosity cannot be discarded. A morphological cladistic analysis including several extinct and extant Chlamyphoridae and Dasypodidae armadillos corroborates its inclusion within Plesiodasypus, as well as the early divergent position of this genus within Dasypodinae. This taxon represents the second armadillo recorded for the Letrero Formation (the other being A. aequatorianus), increasing the Dasypodidae diversity at low latitudes during the late Miocene. Additionally, the unusual morphology of this taxon is concordant with the associated endemic paleofauna previously recorded at Nabón basin, which suggests some kind of isolation. R2 2024-07-19T14:36:12Z 2024-07-19T14:36:12Z 2022-11 Reunión Barasoain, Darío Daniel, et al., 2022. A new bizarre armadillo (Mammalia, Xenarthra, Dasypodidae) from the late Miocene of Ecuador. En: Reunión de Comunicaciones de la Asociación Paleontológica Argentina. Salta: Asociación Paleontológica Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Bio y Geociencias del NOA; Universidad Nacional de Salta. Instituto para el Estudio de la Biodiversidad de Invertebrados, p. 23-23. 2469-0228 http://repositorio.unne.edu.ar/handle/123456789/54533 eng openAccess http://creativecommons.org/licenses/by-nc-nd/2.5/ar/ application/pdf p. 23-23 application/pdf Asociación Paleontológica Argentina Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Bio y Geociencias del NOA Universidad Nacional de Salta. Instituto para el Estudio de la Biodiversidad de Invertebrados
institution Universidad Nacional del Nordeste
institution_str I-48
repository_str R-184
collection RIUNNE - Repositorio Institucional de la Universidad Nacional del Nordeste (UNNE)
language Inglés
topic Armadillo
Mioceno tardío
Ecuador
spellingShingle Armadillo
Mioceno tardío
Ecuador
Barasoain, Darío Daniel
Román Carrión, José Luis
Zurita, Alfredo Eduardo
Miño Boilini, Ángel Ramón
A new bizarre armadillo (Mammalia, Xenarthra, Dasypodidae) from the late Miocene of Ecuador
topic_facet Armadillo
Mioceno tardío
Ecuador
description The Dasypodidae (Astegotheriinae, Stegotheriinae and Dasypodinae), constitute the sister group of the remaining diversity of "armadillos" (Chlamyphoridae), and the most ancient group within Xenarthra, with a divergence estimated in ca. 40 Ma. Among Dasypodidae, only Dasypodinae has living representatives, including over 8 species of Dasypus. Dasypodinae armadillos have their oldest records coming from the middle Miocene of La Venta (Colombia), and become relatively abundant at lower latitudes in South America during the Miocene. Recognized taxa for this lapse include Plesiodasypus colombianus (La Victoria Formation, ca. 13 Ma) and Anadasypus hondanus (Villavieja Formation, ca. 12 Ma) for the middle Miocene of La Venta, Colombia, and Anadasypus aequatorianus (Letrero Formation, ca. 11.2-9 Ma) for the late Miocene of Nabón, Ecuador. Here, we report a new and bizarre armadillo exhumed from the Letrero Formation levels outcropping at Nabón basin, southern Ecuador. Materials (EPNPv-6381) are housed in the Colección de Paleontología, Escuela Politécnica Nacional (Quito, Ecuador), and include several fixed and mobile osteoderms of the dorsal carapace belonging to a single individual, which was found partially articulated in the field. The presence of enlarged mobile osteoderms with a very developed articular portion and a clear dasypodine-like ornamentation pattern (shared by all dasypodine armadillos) on their exposed surface allow to include it within Dasypodidae Dasypodinae. In turn, the presence of fixed osteoderms with a rectangular outline, and an ornamentation pattern composed of an elongated and keeled central figure surrounded by minor peripheral figures allow its inclusion within Plesiodasypus. This new taxon is supported by some unusual features that represent solid autapomorphic characters, being the most relevant: 1) denticulated lateral edges in fixed osteoderms and the articular portions of mobile osteoderms, and 2) very large foramina along the main sulcus that delimitates the central figure of mobile osteoderms, tentatively interpreted as a complex glandular system restricted to mobile osteoderms, though a certain degree of associated pilosity cannot be discarded. A morphological cladistic analysis including several extinct and extant Chlamyphoridae and Dasypodidae armadillos corroborates its inclusion within Plesiodasypus, as well as the early divergent position of this genus within Dasypodinae. This taxon represents the second armadillo recorded for the Letrero Formation (the other being A. aequatorianus), increasing the Dasypodidae diversity at low latitudes during the late Miocene. Additionally, the unusual morphology of this taxon is concordant with the associated endemic paleofauna previously recorded at Nabón basin, which suggests some kind of isolation. R2
format Reunión
author Barasoain, Darío Daniel
Román Carrión, José Luis
Zurita, Alfredo Eduardo
Miño Boilini, Ángel Ramón
author_facet Barasoain, Darío Daniel
Román Carrión, José Luis
Zurita, Alfredo Eduardo
Miño Boilini, Ángel Ramón
author_sort Barasoain, Darío Daniel
title A new bizarre armadillo (Mammalia, Xenarthra, Dasypodidae) from the late Miocene of Ecuador
title_short A new bizarre armadillo (Mammalia, Xenarthra, Dasypodidae) from the late Miocene of Ecuador
title_full A new bizarre armadillo (Mammalia, Xenarthra, Dasypodidae) from the late Miocene of Ecuador
title_fullStr A new bizarre armadillo (Mammalia, Xenarthra, Dasypodidae) from the late Miocene of Ecuador
title_full_unstemmed A new bizarre armadillo (Mammalia, Xenarthra, Dasypodidae) from the late Miocene of Ecuador
title_sort new bizarre armadillo (mammalia, xenarthra, dasypodidae) from the late miocene of ecuador
publisher Asociación Paleontológica Argentina
publishDate 2024
url http://repositorio.unne.edu.ar/handle/123456789/54533
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