Teinolophosteinolophos 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
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
- 1 Jaws
- 2 Ears
- 3 See also
- 4 Notes
- 5 References
- 6 Links
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
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
- Monotreme § Fossil monotremes
- ^ 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
- 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
|Wikispecies has information related to Teinolophos|
- 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
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