Ernanodon

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Ernanodon
Temporal range: 62.22–56.0  Ma
O
S
D
C
P
T
J
K
Pg
N
middle to late Paleocene
Skeleton of Ernanodon antelios.jpg
Reconstructed skeleton at the National Museum of Nature and Science, Tokyo, Japan
Ernanodon NT.jpg
Reconstruction of Ernanodon antelios
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Palaeanodonta
Family: Ernanodontidae
Genus: Ernanodon
Ding, 1979 [1]
Type species
Ernanodon antelios
Ding, 1979

Ernanodon ("a sprout of toothless animals") is an extinct genus of placental mammal from extinct family Ernanodontidae within extinct order Palaeanodonta, that lived from the middle to late Paleocene in China (Nongshan Formation) [2] and Mongolia. [3]

Contents

Characteristics of taxa and history of classification

Ernanodon antelios was a relatively small animal about 50 centimetres (20 in) in length, not including the tail. [4] When it was first discovered and examined, it was thought to be a primitive anteater. It and Eurotamandua of Eocene Germany helped to support a now-abandoned hypothesis that there was movement between the faunas of South America (the homeland of anteaters and other xenarthrans), and the faunas of Europe and Asia, by way of North America. [5] This was further supported by the alleged European Phorusrhacid Strigogyps , also of Eocene Germany.

The view of E. antelios being an anteater has been discarded, and the idea that there was any extensive Paleocene faunal interchange with South America has been rethought due to Eurotamandua being now regarded as a scaleless relative of the modern-day pangolin.

E. antelios' placement within Xenarthra is further questioned because it lacks the distinctive joints that characterize Xenarthra, the same reason why Eurotamandua is no longer regarded as a xenarthran. Recent studies from new remains found in Late Paleocene Mongolian strata have led to the assessment that E. antelios is closely related to genus Metacheiromys within the order Palaeanodonta, which in the study, was reaffirmed to be the sister taxon of order Pholidota (the pangolins). [3]

Phylogenetic tree

The phylogenetic relationships of genus Ernanodon is shown in the following cladogram: [6] [7] [3]

  Ferae  

Pan-Carnivora Dogs, jackals, wolves, and foxes (Plate XI).jpg

  Pholidotamorpha  

Pholidota(sensu stricto) Pangolin Hardwicke (white background).jpg

  Palaeanodonta  

Escavadodontidae

 ? 

Melaniella

Amelotabes

Epoicotheriidae

Epoicotherium

Molaetherium

Xenocranium

Epoicotheriinae

Tetrapassalus

Dipassalus

Alocodontulum

Auroratherium

Pentapassalus

Tubulodon

 ? 

Arcticanodon

Propalaeanodontinae

Mylanodon

Brachianodon

Palaeanodon

Metacheiromyinae  

Metacheiromys Metacheiromys DB152-2.jpg

  Ernanodontidae  
 ? 

Asiabradypus

 Ernanodon 

Ernanodon antelios

 (Pholidotasensu lato) 
Epoicotherium/Xenocranium clade

See also

Related Research Articles

<i>Manis</i> Genus of mammals

Manis ("spirit") is a genus of South Asian and East Asian pangolins, the Asiatic pangolins, from subfamily Maninae, within family Manidae.

<i>Eomanis</i> Extinct genus of mammals

Eomanis is the earliest known true pangolin from extinct family Eomanidae within suborder Eupholidota. It lived during the Eocene in Europe. Eomanis fossils found in the Messel Pit in Germany are very similar in size and anatomy to living pangolins of the genus Manis, indicating that pangolins have remained largely unchanged in morphology and behavior for 50 million years. However, unlike modern pangolins, its tail and legs did not bear scales. According to the stomach contents of the excellently preserved Messel specimens, Eomanis’ diet consisted of both insects and plants.

<i>Metacheiromys</i> Extinct genus of mammal

Metacheiromys is an extinct genus of placental mammals from extinct paraphyletic subfamily Metacheiromyinae within extinct paraphyletic family Metacheiromyidae in extinct order Palaeanodonta, that lived in North America from the early to middle Eocene.

<i>Eurotamandua</i> Extinct genus of pangolins

Eurotamandua is an extinct genus of mammal from extinct family Eurotamanduidae that lived during the middle Eocene.

<i>Necromanis</i> Extinct genus of mammals

Necromanis is an extinct genus of pangolin from superfamily Manoidea. It lived from the middle Oligocene to middle Miocene in Europe. It was originally placed within family Manidae, but was eventually removed from it as more fossil pholidotids from outside that family were found and studied more extensively. Currently, Necromanis is placed as incertae sedis within the pholidotid superfamily Manoidea, together with the families Manidae and Patriomanidae.

<span class="mw-page-title-main">Epoicotheriidae</span> Extinct family of mammals

Epoicotheriidae is an extinct paraphyletic family of insectivorous placental mammals within extinct order Palaeanodonta, that lived in North America, Asia and Europe from the late Paleocene to early Oligocene. Epoicotheriids were fossorial mammals. Late Eocene/early Oligocene genera were highly specialized animals that were convergent with the talpids, golden moles and marsupial mole in the structure of their skulls and forelimbs, and would have had a similar lifestyle as subterranean burrowers.

Escavadodon is an extinct genus of pangolin-like myrmecophagous placental mammals of extinct monotypic family Escavadodontidae within extinct order Palaeanodonta, that lived in North America during the middle Paleocene. It contains a single species, Escavadodon zygus, recovered from the Nacimiento Formation of New Mexico.

<span class="mw-page-title-main">Paratheria (mammals)</span> Former taxonomic group including xenarthran and similar mammals

Paratheria is an obsolete term for a taxonomic group including the xenarthran mammals and various groups thought to be related to them. It was proposed by Oldfield Thomas in 1887 to set apart the sloths, anteaters, armadillos, and pangolins, usually classified as placentals, from both marsupial and placental mammals, an arrangement that received little support from other workers. When teeth of the extinct gondwanathere mammals were first discovered in Argentina in the 1980s, they were thought to be related to xenarthrans, leading to renewed attention for the hypothesis that xenarthrans are not placentals. However, by the early 1990s, gondwanatheres were shown to be unrelated to xenarthrans, and xenarthrans are still considered to be placentals.

<i>Smutsia</i> Genus of mammals

African ground pangolin is a genus of pangolins from subfamily Smutsiinae within family Manidae. It was formerly considered a subgenus of genus Manis. Its members are the more terrestrial of the African pangolins. In past, this genus was also present in Europe.

<span class="mw-page-title-main">Palaeanodonta</span> Extinct clade of mammals

Palaeanodonta is an extinct clade of stem-pangolins. They were insectivorous (myrmecophagous), possibly fossorial, and lived from the middle Paleocene to early Oligocene in North America, Europe and Asia. While the taxonomic grouping of Palaeanodonta has been debated, it is widely thought that they are a sister group to pangolins.

<span class="mw-page-title-main">Patriomanidae</span> Extinct family of pangolins

Patriomanidae is an extinct family of pangolins from superfamily Manoidea that includes two extinct genera Patriomanis and Cryptomanis.

<span class="mw-page-title-main">Ernanodontidae</span> Extinct family of mammals

Ernanodontidae is an extinct family of myrmecophagous placental mammals within extinct order Palaeanodonta, that lived in Asia from the middle to late Paleocene.

<span class="mw-page-title-main">Pholidotamorpha</span> Clade of mammals

Pholidotamorpha is a clade of placental mammals from mirorder Ferae that includes the order Pholidota and extinct order Palaeanodonta.

<i>Euromanis</i> Genus of mammals

Euromanis is one of the earliest known pangolin genera. It lived during the middle Eocene in Europe. Euromanis fossils found in the Messel Pit in Germany. Unlike modern pangolins, it did not bear scales on its body.

<span class="mw-page-title-main">Eupholidota</span> Suborder of pangolins

Eupholidota is a suborder of pangolins that includes two superfamilies: extant Manoidea and extinct Eomanoidea.

<span class="mw-page-title-main">Manoidea</span> Superfamily of pangolins

Manoidea ("spirits") is a superfamily of pangolins from suborder Eupholidota that includes extant family Manidae, extinct family Patriomanidae and extinct genus Necromanis.

<i>Xenocranium</i> Genus of prehistoric burrowing mammals

Xenocranium is an extinct monotypic genus of placental mammal from extinct paraphyletic subfamily Epoicotheriinae within extinct paraphyletic family Epoicotheriidae in extinct order Palaeanodonta, that lived in North America during the late Eocene.

<span class="mw-page-title-main">Metacheiromyidae</span> Extinct family of mammals

Metacheiromyidae is an extinct paraphyletic family of myrmecophagous placental mammals within extinct order Palaeanodonta, that lived in North America and Europe from the late Paleocene to middle Eocene.

<span class="mw-page-title-main">Epoicotheriinae</span> Extinct subfamily of mammals

Epoicotheriinae is an extinct paraphyletic subfamily of insectivorous placental mammals within extinct paraphyletic family Epoicotheriidae in extinct order Palaeanodonta, that lived in North America and Europe from the early Eocene to early Oligocene. Epoicotheriins were fossorial mammals. Late Eocene/early Oligocene genera were highly specialized animals that were convergent with the talpids, golden moles and marsupial mole in the structure of their skulls and forelimbs, and would have had a similar lifestyle as subterranean burrowers.

Cryptomanis is an extinct genus of pangolin from extinct family Patriomanidae. The genus is only known from the holotype specimen from middle Eocene deposits from Inner Mongolia, China. The holotype, AMNH 26140, was for years labeled as an unnamed pangolin in the fossil collection for decades. The remains comprise of an incomplete postcranial specimen, with nearly complete hind limbs, an incomplete pelvis, a complete lumbar series from an incomplete vertebral column, numerous fragmentary remains of rib and sternal bones, a fragmentary scapula, and partially preserved forelimbs. Based on the femural length Cryptomanis was comparable in size to the modern Sunda pangolin.

References

  1. S. Ding (1979.) "A new edentate from the Paleocene of Guandong." Vertebrata PalAsiatica 17:57-64
  2. S.-Y. Ding (1987.) "A Paleocene edentate from the Nanxiong Basin, Guangdong." Palaeontologia Sinica 173:1-118
  3. 1 2 3 Kondrashov, Peter; Agadjanian, Alexandre K (2012). "A nearly complete skeleton of Ernanodon (Mammalia, Palaeanodonta) from Mongolia: morphofunctional analysis". Journal of Vertebrate Paleontology. 32 (5): 983–1001. doi:10.1080/02724634.2012.694319. S2CID   86059673.
  4. Kemp, TS (2005). The origin and evolution of mammals. Oxford University Press. ISBN   9780198507604.
  5. Agusti, Jordi; Antón, Mauricio (2002). Mammoths, Sabertooths, and Hominids. New York: Columbia University Press. ISBN   9780231116404. OCLC   488732612.
  6. Kenneth D. Rose (2008). "Palaeanodonta and Pholidota". In Janis, Christine M; Gunnell, Gregg F; Uhen, Mark D (eds.). 9 - Palaeanodonta and Pholidota. pp. 135–146. doi:10.1017/CBO9780511541438.010. ISBN   9780511541438.
  7. Gaudin, Timothy (2009). "The Phylogeny of Living and Extinct Pangolins (Mammalia, Pholidota) and Associated Taxa: A Morphology Based Analysis" (PDF). Journal of Mammalian Evolution. Heidelberg, Germany: Springer Science+Business Media. 16 (4): 235–305. doi:10.1007/s10914-009-9119-9. S2CID   1773698. Archived from the original (PDF) on 2015-09-25. Retrieved 2020-08-28.

Bibliography