Osteoderm morphology and taxonomy of Pampatheriidae (Cingulata, Xenarthra) from the Quaternary of the Neotropical region

Autor(es)

Ferreira, Thais Matos Pereira ; Casali, Daniel de Melo ; Das Neves, Simone Baes ; Ribeiro, Ana Maria

• Tipo de documento: Artigo Científico
• Fonte: HISTORICAL BIOLOGY; v. N/A, p. 19-pg., 2025-01-08.

Resumo

This study analyses Neotropical Quaternary pampatheriids' osteoderm morphology and reviews their taxonomic history since the first publications accounting for dermal plates. The main objectives are to illustrate and describe for the first time the first osteoderms attributed to Pampatherium humboldtii and the lectotype of Holmesina major, both from Lund's publications; as much as the neotype of P. typum from Ameghino's first records, and the hypodigms designated in this paper; and also, to re-evaluate the taxonomy and redescribe in greater detail the osteoderms from the hypodigm of P. mexicanum, H. paulacoutoi, and H. occidentalis. The taxa Tonnicinctus mirus, H. cryptae, H. floridana, H. septentrionalis, Plaina intermedia, Pl. subintermedia, and Pl. brocherense are used solely for comparative analysis. The results allowed the definition of morphological patterns. All taxa are considered to be valid, except for the synonymy herein proposed between H. major and H. paulacoutoi, based on morphological, geographical, and historical data, with H. major taking precedence. Furthermore, the morphological pattern of the osteoderms of H. cryptae is considered equivalent to that of the genus Pampatherium. It is suggested that future studies should be carried out using cranial and other skeletal elements to further evaluate the taxonomic status of H. cryptae. (AU)

• Processo FAPESP: 22/00044-7 - Filogenia, tempos de divergência e biogeografia histórica de Xenarthra (Mammalia, Eutheria): combinando dados morfológicos e moleculares
• Beneficiário: Daniel de Melo Casali
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado