Mon . 20 Jul 2020
TR | RU | UK | KK | BE |

Teinolophos

teinolophos trusleri, teinolophos
Teinolophos trusleri was a prehistoric species of monotreme, or egg-laying mammal It is known from four specimens, each consisting of a partial lower jawbone collected from Flat Rocks, Victoria, Australia It lived during the Aptian age of the Lower Cretaceous

The species name honours the artist Peter Trusler The genus name, Teinolophos, means "extended ridge", a reference to its tooth structure

Originally, Teinolophos was thought to be a eupanthothere Further research revealed similarities to Steropodon, except in size: the animal was around 10 cm long It is usually listed as a steropodontid, though it may be more basal[1]

The holotype is a partial left dentary known as NMV P208231 An age of approximately 123 million years makes this the earliest known monotreme The lower molar is broadly similar in morphology to the m2 of Steropodon The trigonid is compressed and the talonid has no basin The dentary is about one sixth the size of Steropodon's, and wear facets indicate an "orthal" occlusion with the upper molars

Contents

  • 1 Jaws
  • 2 Ears
  • 3 See also
  • 4 Notes
  • 5 References
  • 6 Links

Jaws

The construction of the lower jaw differs from existing monotremes Among the contrasts are the condyle, which is well above the tooth row instead of at about the same height; and the ascending ramus, which is also higher Also different is that Teinolophos probably had a strong bite A unique feature for known toothed monotremes is that the trigonid is tall, while the talonid is set much lower This is more like the general mammalian arrangement The molar is double-rooted, which is plesiomorphic when compared to ornithorhynchids, but is a shared characteristic with Steropodon and Kollikodon Subsequent monotreme molars are multi-rooted

Unlike modern monotremes, Teinolophos lacked a beak[1]

Ears

Unlike modern monotremes, which have suspended ear bones much like placentals and marsupials, Teinolophos still had them connected to the jaw via the Meckel's cartilage This reinforces the idea that the modern ear condition evolved independently among monotremes and therians[1]

See also

  • Monotreme § Fossil monotremes

Notes

  1. ^ a b c Thomas H Rich, James A Hopson, Pamela G Gill, Peter Trusler, Sally Rogers-Davidson, Steve Morton, Richard L Cifelli, David Pickering, Lesley Kool, Karen Siu, Flame A Burgmann, Tim Senden, Alistair R Evans, Barbara E Wagstaff, Doris Seegets-Villiers, Ian J Corfe, Timothy F Flannery, Ken Walker, Anne M Musser, Michael Archer, Rebecca Pian and Patricia Vickers-Rich 2016 "The mandible and dentition of the Early Cretaceous monotreme Teinolophos trusleri" Alcheringa: An Australasian Journal of Palaeontology in press doi:101080/0311551820161180034

References

  • Rich et al "Early Cretaceous Mammals from Flat Rocks, Victoria, Australia" Records of the Queen Victoria Museum, Launceston 1999
  • Rich, T H, et al "Monotreme nature of the Australian Early Cretaceous mammal Teinolophos" Acta Palaeontologica Polonica 461 2001 Pages 113–118
  • Rowe, T, et al "The oldest platypus and its bearing on divergence timing of the platypus and echidna clades" Proceedings of the National Academy of Sciences 1054 2008 Pages 1238–1242


Links

  • Life in the Shadows, Non-reptilian life in Mesozoic Australia
  • Mesozoic Mammals: Monotremata, an Internet directory
  • "Prehistoric jawbone reveals evolution repeating itself" 10 February 2005
  • "The oldest platypus and its bearing on divergence timing of the platypus and echidna clades" 2008

teinolophos, teinolophos trusleri


Teinolophos Information about

Teinolophos


  • user icon

    Teinolophos beatiful post thanks!

    29.10.2014


Teinolophos
Teinolophos
Teinolophos viewing the topic.
Teinolophos what, Teinolophos who, Teinolophos explanation

There are excerpts from wikipedia on this article and video

Random Posts

IP address blocking

IP address blocking

IP address blocking prevents connection between a server or website and certain IP addresses or rang...
Gisele Bündchen

Gisele Bündchen

Gisele Caroline Bündchen1 Portuguese pronunciation: ʒiˈzɛli kaɾoˈlini ˈbĩtʃẽj, German pronuncia...
Sheldon, West Midlands

Sheldon, West Midlands

Sheldon is an area of east Birmingham, England Historically part of Warwickshire, it is close to the...
Beverly, Chicago

Beverly, Chicago

Beverly is one of the 77 community areas of Chicago, Illinois It is located on the South Side on the...