A new dolphin from the early Miocene of Patagonia, Argentina: Insights into the evolution of Platanistoidea in the Southern Hemisphere

• Autorzy: Viglino M. , Buono M.R. , Gutstein C.S. , Cozzuol M.A. , Cuitino J.I.
• Języki publikacji: EN

Abstrakty

EN

The contents of the superfamily Platanistoidea, an early-diverging lineage comprising extinct species and a single extant representative of South Asian river dolphin (Platanista gangetica), remain controversial. We describe here a partial skull and associated tympano-periotic bones identified as a new genus and species, Aondelphis talen gen. et sp. nov., collected in the lower levels of the Gaiman Formation (early Miocene), in Patagonia (Chubut Province, Argentina). Aondelphis is the first Patagonian platanistoid species named in almost a century. Phylogenetic analyses suggest Aondelphis talen gen. et sp. nov. and a taxon from New Zealand (cf. Papahu ZMT-73) are basal Platanistoidea sensu lato. Unambiguous synapomorphies related to the ear bones allowed us to determine its phylogenetic position. Aondelphis talen markedly differs from the other well-known early Miocene Patagonian platanistoid Notocetus, suggesting the coexistence of at least two different morphotypes that may have occupied different ecological niches at that time. The putative close relationship with a species from New Zealand indicates there was a rapid diversification and widespread distribution of the group in the Southern Hemisphere during the early Miocene. The description of new species and revision of historical records of Patagonian platanistoids can help shedding light on cetacean assemblages of the Patagonian sea during this epoch.

• Wydawca: -
• Czasopismo: Acta Palaeontologica Polonica
• Rocznik: 2018
• Tom: 63
• Numer: 2
• Opis fizyczny: p.261-277,fig.,ref.

Twórcy

autor

Viglino M.

• Instituto Patagonico de Geología y Paleontología, CONICET, Puerto Madryn, U9120ACD, Chubut, Argentina

autor

Buono M.R.

• Instituto Patagonico de Geología y Paleontología, CONICET, Puerto Madryn, U9120ACD, Chubut, Argentina

autor

Gutstein C.S.

• Laboratorio de Ontogeniay Filogenia, Departamento de Biologia, Facultad de Ciencias, Universidad de Chile, Nunoa, 8320000, Santiago, Chile. Área Patrimonio Natural, Consejo de Monumentos Nacionales, Providencia, 7500000, Santiago, Chile

autor

Cozzuol M.A.

• Departamento de Zoologia, Instituto de Ciencias Biologicas, Universidade Federal de Minas Gerais, 31270-910, Pampulha, Belo Horizonte, Minas Gerais, Brazil

autor

Cuitino J.I.

• Instituto Patagonico de Geologia y Paleontologia, CONICET, Puerto Madryn, U9120ACD, Chubut, Argentina

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Identyfikatory

DOI

10.4202/app.00441.2017