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Phylogenetic relationships among sloths (Mammalia, Xenarthra, Tardigrada): the craniodental evidence

Identifieur interne : 007937 ( Main/Exploration ); précédent : 007936; suivant : 007938

Phylogenetic relationships among sloths (Mammalia, Xenarthra, Tardigrada): the craniodental evidence

Auteurs : Timothy J. Gaudin [États-Unis]

Source :

RBID : ISTEX:D2624D965E122F8AACF004A61615CB217B356EF4

Descripteurs français

English descriptors

Abstract

This study is undertaken in order to evaluate specific hypotheses of relationship among extant and extinct sloths (Mammalia, Xenarthra, Tardigrada). Questions of particular interest include the relationship among the three traditional family groupings of extinct ground sloths and the monophyletic or diphyletic origin of the two genera of extant tree sloths. A computer‐based cladistic investigation of the phylogenetic relationships among 33 sloth genera is performed based upon 286 osteological characteristics of the skull, lower jaw, dentition and hyoid arch. Characters are polarized via comparisons with the following successive outgroups, all members of the supraordinal grouping Edentata: the Vermilingua, or anteaters; the Cingulata, or armadillos and glyptodonts; the Palaeanodonta; and the Pholidota, or pangolins. The results of the analysis strongly corroborate the diphyly of living tree sloths, with the three‐toed sloth Bradypus positioned as the sister‐taxon to all other sloths, and the two‐toed sloth Choloepus allied with extinct members of the family Megalonychidae. These results imply that the split between the two extant sloth genera is ancient, dating back perhaps as much as 40 Myr, and that the similarities between the two taxa, including their suspensory locomotor habits, present one of the most dramatic examples of convergent evolution known among mammals. The monophyly of the three traditional ground sloth families Megatheriidae, Megalonychidae and Mylodontidae is confirmed in the present study, and the late Miocene–Pleistocene nothrotheres are shown to form a clade. It is suggested that this latter clade merits recognition as a distinct family‐level grouping, the family Nothrotheriidae. The monophyly of the Megatherioidea, a clade including members of the families Megatheriidae, Megalonychidae and Nothrotheriidae, is also supported. Within Megatherioidea, the families Nothrotheriidae and Megatheriidae form a monophyletic group called the Megatheria. The relationships within the families Megatheriidae and Mylodontidae are fully and consistently resolved, although the hypothesized scheme of relationships among the late Miocene to Pleistocene members of the mylodontid subfamily Mylodontinae differ strongly from any proposed by previous authors. Within the family Megalonychidae, Choloepus is allied to a monophyletic grouping of West Indian sloths, although the relationships within this clade are not fully resolved. © 2004 The Linnean Society of London, Zoological Journal of the Linnean Society, 2004, 140, 255–305.

Url:
DOI: 10.1111/j.1096-3642.2003.00100.x


Affiliations:


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Le document en format XML

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<term>Academia brasileira</term>
<term>Acratocnus</term>
<term>Alisphenoid</term>
<term>Alternative hypotheses</term>
<term>Ambiguous characters</term>
<term>American museum</term>
<term>American museum novitates</term>
<term>Amnh</term>
<term>Analcimorphus</term>
<term>Angeles county</term>
<term>Angular process</term>
<term>Anteater</term>
<term>Anterior</term>
<term>Anterior edge</term>
<term>Anteriorly</term>
<term>Anteroposterior</term>
<term>Anteroposterior length</term>
<term>Anteroposteriorly</term>
<term>Anteroventral</term>
<term>Antillean</term>
<term>Auditory</term>
<term>Auditory region</term>
<term>Auditory region characters</term>
<term>Basal</term>
<term>Basal megatherioids</term>
<term>Black lines</term>
<term>Bootstrap</term>
<term>Bradypus</term>
<term>Braincase</term>
<term>Braincase width</term>
<term>Branch support</term>
<term>Branch support value</term>
<term>Branch support values</term>
<term>Buccinator fossa</term>
<term>Buenos aires</term>
<term>Cartelle</term>
<term>Catonyx</term>
<term>Character state changes</term>
<term>Character states</term>
<term>Choloepus</term>
<term>Cingulata</term>
<term>Clade</term>
<term>Condylar</term>
<term>Condyle</term>
<term>Condyloid</term>
<term>Condyloid process</term>
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<term>Convergent</term>
<term>Convex</term>
<term>Coronoid</term>
<term>Coronoid process</term>
<term>Couto</term>
<term>Cranial</term>
<term>Craniodental</term>
<term>Craniodental characters</term>
<term>Crown group</term>
<term>Cyclopes</term>
<term>Data matrix</term>
<term>Dental characters</term>
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<term>Diphyly</term>
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<term>Dorsal view</term>
<term>Dorsally</term>
<term>Dorsoventrally</term>
<term>Ecology</term>
<term>Edentata</term>
<term>Edentate</term>
<term>Engelmann</term>
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<term>Eremotherium</term>
<term>Eucholoeops</term>
<term>Euphractus</term>
<term>Eutardigrada</term>
<term>Eutherian</term>
<term>Extant</term>
<term>Extant sloth genera</term>
<term>Extant taxa</term>
<term>External nares</term>
<term>Extinct</term>
<term>Extinct sloths</term>
<term>Families megatheriidae</term>
<term>Family megalonychidae</term>
<term>Family megatheriidae</term>
<term>Family nothrotheriidae</term>
<term>Fmnh</term>
<term>Foramen</term>
<term>Foramen magnum</term>
<term>Fossa</term>
<term>Fossil</term>
<term>Frailey</term>
<term>Gaudin</term>
<term>Gaudin branham</term>
<term>Genus</term>
<term>Glenoid</term>
<term>Glossotherium</term>
<term>Glyptodonts</term>
<term>Greenwood</term>
<term>Ground sloths</term>
<term>Guth</term>
<term>Hapalops</term>
<term>Hirschfeld</term>
<term>Hirschfeld webb</term>
<term>Hoffstetter</term>
<term>Holmesina</term>
<term>Horizontal ramus</term>
<term>Intermediate development</term>
<term>Interrelationship</term>
<term>Iuliis</term>
<term>Jugal</term>
<term>Kraglievich</term>
<term>Lacrimal</term>
<term>Lacrimal foramen</term>
<term>Lamina</term>
<term>Late miocene</term>
<term>Lateral</term>
<term>Lateral view</term>
<term>Laterally</term>
<term>Lestodon</term>
<term>Linnean</term>
<term>Linnean society</term>
<term>Lobate</term>
<term>Long axis</term>
<term>Lower teeth</term>
<term>Lower tooth</term>
<term>Lydekker</term>
<term>Macphee</term>
<term>Mammal</term>
<term>Mammalia</term>
<term>Mandible</term>
<term>Mandibular</term>
<term>Mandibular canal</term>
<term>Mandibular coronoid process</term>
<term>Mandibular symphysis</term>
<term>Matthew paula couto</term>
<term>Maxilla</term>
<term>Maxillary</term>
<term>Maxillary foramen</term>
<term>Mcdonald</term>
<term>Mcdonald perea</term>
<term>Mckenna</term>
<term>Mckenna bell</term>
<term>Medial</term>
<term>Medial palatal process</term>
<term>Mediolaterally</term>
<term>Megalocnus</term>
<term>Megalonychid</term>
<term>Megalonychidae</term>
<term>Megalonychids</term>
<term>Megalonychoidea</term>
<term>Megalonyx</term>
<term>Megatheria</term>
<term>Megatheriid</term>
<term>Megatheriidae</term>
<term>Megatherioidea</term>
<term>Megatherioids</term>
<term>Megatherium</term>
<term>Metacheiromys</term>
<term>Miocene</term>
<term>Moderate length</term>
<term>Molariform</term>
<term>Molariform teeth</term>
<term>Molariforms</term>
<term>Monophyletic</term>
<term>Monophyletic group</term>
<term>Monophyly</term>
<term>Morphology</term>
<term>Muizon</term>
<term>Muizon mcdonald</term>
<term>Multistate</term>
<term>Mylodon</term>
<term>Mylodontid</term>
<term>Mylodontidae</term>
<term>Mylodontinae</term>
<term>Mylodontines</term>
<term>Myrmecophaga</term>
<term>Naples</term>
<term>Nasal region</term>
<term>Nasopharynx</term>
<term>Natural history</term>
<term>Natural history museum</term>
<term>Nematherium</term>
<term>Neocnus</term>
<term>Nnnnn</term>
<term>Nnnnn nnnnn nnnnn nnnnn nnnnn</term>
<term>Node</term>
<term>Nothropus</term>
<term>Nothrotheres</term>
<term>Nothrotheriidae</term>
<term>Nothrotheriids</term>
<term>Nothrotheriops</term>
<term>Nothrotherium</term>
<term>Novacek</term>
<term>Nuchal</term>
<term>Nuchal crest</term>
<term>Occipital</term>
<term>Occipital condyles</term>
<term>Occiput</term>
<term>Occlusal</term>
<term>Occlusal surface</term>
<term>Octodontotherium</term>
<term>Octomylodon</term>
<term>Optic foramen</term>
<term>Orbital exposure</term>
<term>Orbital foramina</term>
<term>Order xenarthra</term>
<term>Orthodentine</term>
<term>Other mylodontines</term>
<term>Other sloths</term>
<term>Outer layer</term>
<term>Outgroup</term>
<term>Outgroups</term>
<term>Ovate</term>
<term>Palaeanodon</term>
<term>Palaeanodonta</term>
<term>Palaeanodonts</term>
<term>Palaeomyrmidon</term>
<term>Palatal</term>
<term>Palatal surface</term>
<term>Palate</term>
<term>Paleontology</term>
<term>Pangolin</term>
<term>Paramylodon</term>
<term>Parocnus</term>
<term>Pascual</term>
<term>Patterson</term>
<term>Patterson pascual</term>
<term>Paula couto</term>
<term>Paup</term>
<term>Paup analyses</term>
<term>Pelecyodon</term>
<term>Perea</term>
<term>Pholidota</term>
<term>Phylogenetic</term>
<term>Phylogenetic hypotheses</term>
<term>Phylogenetic relationships</term>
<term>Phylogeny</term>
<term>Pilosa</term>
<term>Planops</term>
<term>Pleistocene</term>
<term>Pleurolestodon</term>
<term>Pliometanastes</term>
<term>Pliomorphus</term>
<term>Poinar</term>
<term>Postcranial</term>
<term>Posterior</term>
<term>Posterior edge</term>
<term>Posterior teeth</term>
<term>Posteriorly</term>
<term>Postorbital</term>
<term>Postorbital process</term>
<term>Premaxilla</term>
<term>Preorbital length</term>
<term>Present analysis</term>
<term>Present study</term>
<term>Previous authors</term>
<term>Pronothrotherium</term>
<term>Protamandua</term>
<term>Prozaedyus</term>
<term>Pseudoprepotherium</term>
<term>Pterygoid</term>
<term>Ramus</term>
<term>Region characters</term>
<term>Robust</term>
<term>Sagittal crest</term>
<term>Santacrucian</term>
<term>Scelidotheriinae</term>
<term>Scelidotherium</term>
<term>Schismotherium</term>
<term>Sister group</term>
<term>Sister taxa</term>
<term>Sister taxon</term>
<term>Skull</term>
<term>Sloth</term>
<term>Sloth interrelationships</term>
<term>Sloth taxa</term>
<term>Smithsonian institution press</term>
<term>Snout</term>
<term>Sphenopalatine foramen</term>
<term>Sphenorbital</term>
<term>Spout</term>
<term>Squamosal</term>
<term>Strict consensus tree</term>
<term>Subfamily</term>
<term>Symphyseal</term>
<term>Symphyseal spout</term>
<term>Symphysis</term>
<term>Synapomorphies</term>
<term>Szalay</term>
<term>Tamandua</term>
<term>Tardigrada</term>
<term>Taxon</term>
<term>Taxonomic</term>
<term>Thinobadistes</term>
<term>Tolypeutes</term>
<term>Toothrow</term>
<term>Transverse width</term>
<term>Tree sloth diphyly</term>
<term>Tree sloths</term>
<term>Tympanic cavity</term>
<term>Unambiguous</term>
<term>Unambiguous synapomorphies</term>
<term>Unequivocal</term>
<term>Unequivocal synapomorphies</term>
<term>Unpublished dphil thesis</term>
<term>Various families</term>
<term>Ventral</term>
<term>Ventral view</term>
<term>Ventrally</term>
<term>Vermilingua</term>
<term>Vermilinguas</term>
<term>Vertebrate</term>
<term>Vertebrate paleontology</term>
<term>Vomer</term>
<term>Vomerine wings</term>
<term>Weak bootstrap</term>
<term>Webb</term>
<term>Webb perrigo</term>
<term>Weighting</term>
<term>West indies</term>
<term>White macphee</term>
<term>Winge</term>
<term>Xenarthra</term>
<term>Xenarthrans</term>
<term>Zoological</term>
<term>Zoological journal</term>
<term>Zygomatic</term>
<term>Zygomatic process</term>
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<keywords scheme="Teeft" xml:lang="en">
<term>Academia brasileira</term>
<term>Acratocnus</term>
<term>Alisphenoid</term>
<term>Alternative hypotheses</term>
<term>Ambiguous characters</term>
<term>American museum</term>
<term>American museum novitates</term>
<term>Amnh</term>
<term>Analcimorphus</term>
<term>Angeles county</term>
<term>Angular process</term>
<term>Anteater</term>
<term>Anterior</term>
<term>Anterior edge</term>
<term>Anteriorly</term>
<term>Anteroposterior</term>
<term>Anteroposterior length</term>
<term>Anteroposteriorly</term>
<term>Anteroventral</term>
<term>Antillean</term>
<term>Auditory</term>
<term>Auditory region</term>
<term>Auditory region characters</term>
<term>Basal</term>
<term>Basal megatherioids</term>
<term>Black lines</term>
<term>Bootstrap</term>
<term>Bradypus</term>
<term>Braincase</term>
<term>Braincase width</term>
<term>Branch support</term>
<term>Branch support value</term>
<term>Branch support values</term>
<term>Buccinator fossa</term>
<term>Buenos aires</term>
<term>Cartelle</term>
<term>Catonyx</term>
<term>Character state changes</term>
<term>Character states</term>
<term>Choloepus</term>
<term>Cingulata</term>
<term>Clade</term>
<term>Condylar</term>
<term>Condyle</term>
<term>Condyloid</term>
<term>Condyloid process</term>
<term>Conv</term>
<term>Convergent</term>
<term>Convex</term>
<term>Coronoid</term>
<term>Coronoid process</term>
<term>Couto</term>
<term>Cranial</term>
<term>Craniodental</term>
<term>Craniodental characters</term>
<term>Crown group</term>
<term>Cyclopes</term>
<term>Data matrix</term>
<term>Dental characters</term>
<term>Dentition</term>
<term>Diphyly</term>
<term>Dorsal</term>
<term>Dorsal view</term>
<term>Dorsally</term>
<term>Dorsoventrally</term>
<term>Ecology</term>
<term>Edentata</term>
<term>Edentate</term>
<term>Engelmann</term>
<term>Entotympanic</term>
<term>Eremotherium</term>
<term>Eucholoeops</term>
<term>Euphractus</term>
<term>Eutardigrada</term>
<term>Eutherian</term>
<term>Extant</term>
<term>Extant sloth genera</term>
<term>Extant taxa</term>
<term>External nares</term>
<term>Extinct</term>
<term>Extinct sloths</term>
<term>Families megatheriidae</term>
<term>Family megalonychidae</term>
<term>Family megatheriidae</term>
<term>Family nothrotheriidae</term>
<term>Fmnh</term>
<term>Foramen</term>
<term>Foramen magnum</term>
<term>Fossa</term>
<term>Fossil</term>
<term>Frailey</term>
<term>Gaudin</term>
<term>Gaudin branham</term>
<term>Genus</term>
<term>Glenoid</term>
<term>Glossotherium</term>
<term>Glyptodonts</term>
<term>Greenwood</term>
<term>Ground sloths</term>
<term>Guth</term>
<term>Hapalops</term>
<term>Hirschfeld</term>
<term>Hirschfeld webb</term>
<term>Hoffstetter</term>
<term>Holmesina</term>
<term>Horizontal ramus</term>
<term>Intermediate development</term>
<term>Interrelationship</term>
<term>Iuliis</term>
<term>Jugal</term>
<term>Kraglievich</term>
<term>Lacrimal</term>
<term>Lacrimal foramen</term>
<term>Lamina</term>
<term>Late miocene</term>
<term>Lateral</term>
<term>Lateral view</term>
<term>Laterally</term>
<term>Lestodon</term>
<term>Linnean</term>
<term>Linnean society</term>
<term>Lobate</term>
<term>Long axis</term>
<term>Lower teeth</term>
<term>Lower tooth</term>
<term>Lydekker</term>
<term>Macphee</term>
<term>Mammal</term>
<term>Mammalia</term>
<term>Mandible</term>
<term>Mandibular</term>
<term>Mandibular canal</term>
<term>Mandibular coronoid process</term>
<term>Mandibular symphysis</term>
<term>Matthew paula couto</term>
<term>Maxilla</term>
<term>Maxillary</term>
<term>Maxillary foramen</term>
<term>Mcdonald</term>
<term>Mcdonald perea</term>
<term>Mckenna</term>
<term>Mckenna bell</term>
<term>Medial</term>
<term>Medial palatal process</term>
<term>Mediolaterally</term>
<term>Megalocnus</term>
<term>Megalonychid</term>
<term>Megalonychidae</term>
<term>Megalonychids</term>
<term>Megalonychoidea</term>
<term>Megalonyx</term>
<term>Megatheria</term>
<term>Megatheriid</term>
<term>Megatheriidae</term>
<term>Megatherioidea</term>
<term>Megatherioids</term>
<term>Megatherium</term>
<term>Metacheiromys</term>
<term>Miocene</term>
<term>Moderate length</term>
<term>Molariform</term>
<term>Molariform teeth</term>
<term>Molariforms</term>
<term>Monophyletic</term>
<term>Monophyletic group</term>
<term>Monophyly</term>
<term>Morphology</term>
<term>Muizon</term>
<term>Muizon mcdonald</term>
<term>Multistate</term>
<term>Mylodon</term>
<term>Mylodontid</term>
<term>Mylodontidae</term>
<term>Mylodontinae</term>
<term>Mylodontines</term>
<term>Myrmecophaga</term>
<term>Naples</term>
<term>Nasal region</term>
<term>Nasopharynx</term>
<term>Natural history</term>
<term>Natural history museum</term>
<term>Nematherium</term>
<term>Neocnus</term>
<term>Nnnnn</term>
<term>Nnnnn nnnnn nnnnn nnnnn nnnnn</term>
<term>Node</term>
<term>Nothropus</term>
<term>Nothrotheres</term>
<term>Nothrotheriidae</term>
<term>Nothrotheriids</term>
<term>Nothrotheriops</term>
<term>Nothrotherium</term>
<term>Novacek</term>
<term>Nuchal</term>
<term>Nuchal crest</term>
<term>Occipital</term>
<term>Occipital condyles</term>
<term>Occiput</term>
<term>Occlusal</term>
<term>Occlusal surface</term>
<term>Octodontotherium</term>
<term>Octomylodon</term>
<term>Optic foramen</term>
<term>Orbital exposure</term>
<term>Orbital foramina</term>
<term>Order xenarthra</term>
<term>Orthodentine</term>
<term>Other mylodontines</term>
<term>Other sloths</term>
<term>Outer layer</term>
<term>Outgroup</term>
<term>Outgroups</term>
<term>Ovate</term>
<term>Palaeanodon</term>
<term>Palaeanodonta</term>
<term>Palaeanodonts</term>
<term>Palaeomyrmidon</term>
<term>Palatal</term>
<term>Palatal surface</term>
<term>Palate</term>
<term>Paleontology</term>
<term>Pangolin</term>
<term>Paramylodon</term>
<term>Parocnus</term>
<term>Pascual</term>
<term>Patterson</term>
<term>Patterson pascual</term>
<term>Paula couto</term>
<term>Paup</term>
<term>Paup analyses</term>
<term>Pelecyodon</term>
<term>Perea</term>
<term>Pholidota</term>
<term>Phylogenetic</term>
<term>Phylogenetic hypotheses</term>
<term>Phylogenetic relationships</term>
<term>Phylogeny</term>
<term>Pilosa</term>
<term>Planops</term>
<term>Pleistocene</term>
<term>Pleurolestodon</term>
<term>Pliometanastes</term>
<term>Pliomorphus</term>
<term>Poinar</term>
<term>Postcranial</term>
<term>Posterior</term>
<term>Posterior edge</term>
<term>Posterior teeth</term>
<term>Posteriorly</term>
<term>Postorbital</term>
<term>Postorbital process</term>
<term>Premaxilla</term>
<term>Preorbital length</term>
<term>Present analysis</term>
<term>Present study</term>
<term>Previous authors</term>
<term>Pronothrotherium</term>
<term>Protamandua</term>
<term>Prozaedyus</term>
<term>Pseudoprepotherium</term>
<term>Pterygoid</term>
<term>Ramus</term>
<term>Region characters</term>
<term>Robust</term>
<term>Sagittal crest</term>
<term>Santacrucian</term>
<term>Scelidotheriinae</term>
<term>Scelidotherium</term>
<term>Schismotherium</term>
<term>Sister group</term>
<term>Sister taxa</term>
<term>Sister taxon</term>
<term>Skull</term>
<term>Sloth</term>
<term>Sloth interrelationships</term>
<term>Sloth taxa</term>
<term>Smithsonian institution press</term>
<term>Snout</term>
<term>Sphenopalatine foramen</term>
<term>Sphenorbital</term>
<term>Spout</term>
<term>Squamosal</term>
<term>Strict consensus tree</term>
<term>Subfamily</term>
<term>Symphyseal</term>
<term>Symphyseal spout</term>
<term>Symphysis</term>
<term>Synapomorphies</term>
<term>Szalay</term>
<term>Tamandua</term>
<term>Tardigrada</term>
<term>Taxon</term>
<term>Taxonomic</term>
<term>Thinobadistes</term>
<term>Tolypeutes</term>
<term>Toothrow</term>
<term>Transverse width</term>
<term>Tree sloth diphyly</term>
<term>Tree sloths</term>
<term>Tympanic cavity</term>
<term>Unambiguous</term>
<term>Unambiguous synapomorphies</term>
<term>Unequivocal</term>
<term>Unequivocal synapomorphies</term>
<term>Unpublished dphil thesis</term>
<term>Various families</term>
<term>Ventral</term>
<term>Ventral view</term>
<term>Ventrally</term>
<term>Vermilingua</term>
<term>Vermilinguas</term>
<term>Vertebrate</term>
<term>Vertebrate paleontology</term>
<term>Vomer</term>
<term>Vomerine wings</term>
<term>Weak bootstrap</term>
<term>Webb</term>
<term>Webb perrigo</term>
<term>Weighting</term>
<term>West indies</term>
<term>White macphee</term>
<term>Winge</term>
<term>Xenarthra</term>
<term>Xenarthrans</term>
<term>Zoological</term>
<term>Zoological journal</term>
<term>Zygomatic</term>
<term>Zygomatic process</term>
</keywords>
<keywords scheme="Wicri" type="topic" xml:lang="fr">
<term>écologie</term>
</keywords>
</textClass>
</profileDesc>
</teiHeader>
<front>
<div type="abstract">This study is undertaken in order to evaluate specific hypotheses of relationship among extant and extinct sloths (Mammalia, Xenarthra, Tardigrada). Questions of particular interest include the relationship among the three traditional family groupings of extinct ground sloths and the monophyletic or diphyletic origin of the two genera of extant tree sloths. A computer‐based cladistic investigation of the phylogenetic relationships among 33 sloth genera is performed based upon 286 osteological characteristics of the skull, lower jaw, dentition and hyoid arch. Characters are polarized via comparisons with the following successive outgroups, all members of the supraordinal grouping Edentata: the Vermilingua, or anteaters; the Cingulata, or armadillos and glyptodonts; the Palaeanodonta; and the Pholidota, or pangolins. The results of the analysis strongly corroborate the diphyly of living tree sloths, with the three‐toed sloth Bradypus positioned as the sister‐taxon to all other sloths, and the two‐toed sloth Choloepus allied with extinct members of the family Megalonychidae. These results imply that the split between the two extant sloth genera is ancient, dating back perhaps as much as 40 Myr, and that the similarities between the two taxa, including their suspensory locomotor habits, present one of the most dramatic examples of convergent evolution known among mammals. The monophyly of the three traditional ground sloth families Megatheriidae, Megalonychidae and Mylodontidae is confirmed in the present study, and the late Miocene–Pleistocene nothrotheres are shown to form a clade. It is suggested that this latter clade merits recognition as a distinct family‐level grouping, the family Nothrotheriidae. The monophyly of the Megatherioidea, a clade including members of the families Megatheriidae, Megalonychidae and Nothrotheriidae, is also supported. Within Megatherioidea, the families Nothrotheriidae and Megatheriidae form a monophyletic group called the Megatheria. The relationships within the families Megatheriidae and Mylodontidae are fully and consistently resolved, although the hypothesized scheme of relationships among the late Miocene to Pleistocene members of the mylodontid subfamily Mylodontinae differ strongly from any proposed by previous authors. Within the family Megalonychidae, Choloepus is allied to a monophyletic grouping of West Indian sloths, although the relationships within this clade are not fully resolved. © 2004 The Linnean Society of London, Zoological Journal of the Linnean Society, 2004, 140, 255–305.</div>
</front>
</TEI>
<affiliations>
<list>
<country>
<li>États-Unis</li>
</country>
<region>
<li>Tennessee</li>
</region>
</list>
<tree>
<country name="États-Unis">
<region name="Tennessee">
<name sortKey="Gaudin, Timothy J" sort="Gaudin, Timothy J" uniqKey="Gaudin T" first="Timothy J." last="Gaudin">Timothy J. Gaudin</name>
</region>
<name sortKey="Gaudin, Timothy J" sort="Gaudin, Timothy J" uniqKey="Gaudin T" first="Timothy J." last="Gaudin">Timothy J. Gaudin</name>
</country>
</tree>
</affiliations>
</record>

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