32 research outputs found
A new durophagous phocid (Mammalia: Carnivora) from the late Neogene of Peru and considerations on monachine seals phylogeny
<div><p>Here we describe a new phocid, <i>Hadrokirus martini</i> gen. et sp. nov., from the Pisco Formation, in the locality of Sud-Sacaco (Late Miocene to Early Pliocene of Peru). This taxon is the third true seal described from this locality. It is characterized by strong dentition paired with a powerful masticatory musculature and a peculiar atlas. No precise diet is inferred here, but a propensity for durophagy and predation on large prey (such as the extant leopard seal, <i>Hydrurga leptonyx</i>) can be considered. A cladistic analysis including characters from the literature as well as original ones places <i>Hadrokirus</i> among lobodontines in a clade with <i>Piscophoca pacifica</i>, another phocid from the Pisco Formation. In addition, this analysis supports the monophyly of both Phocinae and Monachinae and recognizes a clade consisting of the four extant species of lobodontines, with <i>Acrophoca longirostris</i> (the third phocid from the Pisco Formation) as sister-group of this clade. All clades are supported by unambiguous non-homoplastic synapomorphies. Following the optimization, our analysis recognizes aquatic innovations as phocine reversions at the scale of Carnivora, or as convergences of monachines with non-phocid pinnipeds.</p><p><a href="http://zoobank.org/urn:lsid:zoobank.org:pub:A9884A4D-99C2-4CB0-BEE9-E2D2830481DD" target="_blank">http://zoobank.org/urn:lsid:zoobank.org:pub:A9884A4D-99C2-4CB0-BEE9-E2D2830481DD</a></p></div
Additional_file_7-revised
File format: .pdf.
Title of data: Additional Results and Discussion.
Description of data. Additional Results and Discussio
Additional_file_4
File format: Movie, .mov.
Title of data: Movie through the CT-scan stack of the extant two-toed sloth Choloepus didactylus (MNHN-ZM-MO1996-594).
Description of data. Coronal sections from posterior to anterio
Additional_file_5
File format: Movie, .avi.
Title of data: Movie through the CT-scan stack of an early species of aquatic sloth, Thalassocnus natans (MNHN-F-SAS-734).
Description of data. Coronal sections from posterior to anterio
Additional_file_6
File format: Movie, .mov.
Title of data: Movie through the CT-scan stack of a late species of aquatic sloth, Thalassocnus carolomartini (SMNK-3814).
Description of data. Coronal sections from posterior to anterio
Additional_file_1-revised
File format: MS Excel spreadsheet, .xls.
Title of data: Raw data table.
Description of data. Raw data table related to Figures 2-3
Additional Results and Discussion. from Evolutionary adaptation to aquatic lifestyle in extinct sloths can lead to systemic alteration of bone structure
Additional Results and Discussio
Additional_file_3-revised2
File format: .pdf.
Title of data: Supplementary Figures.
Description of data
Additional Material and Methods from Evolutionary adaptation to aquatic lifestyle in extinct sloths can lead to systemic alteration of bone structure
Additional Material and Method
Movie through the CT-scan stack of the extant two-toed sloth <i>Choloepus didactylus</i> (MNHN-ZM-MO1996-594). from Evolutionary adaptation to aquatic lifestyle in extinct sloths can lead to systemic alteration of bone structure
Coronal sections from posterior to anterio