Teinolophos

Teinolophos

Taxobox
name = "Teinolophos"
fossil_range = Early Cretaceous
regnum = Animalia
phylum = Chordata
classis = Mammalia
ordo = Monotremata
familia= Steropodontidae
genus = "Teinolophos"
species = "T. trusleri"
binomial = "Teinolophos trusleri"
binomial_authority = Rich et al., 1999

"Teinolophos trusleri" was a prehistoric species of monotreme, or egg-laying mammal. It is known from a lower jawbone found in 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.

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.

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.

The species has been placed in the Steropodontidae in some classifications.

ee also

*Fossil Monotremes

Links and 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" 46(1). 2001 Pages 113–118.
* [http://www.alphalink.com.au/~dannj/non-rept.htm Life in the Shadows, Non-reptilian life in Mesozoic Australia]
* [http://home.arcor.de/ktdykes/monotrem.htm Mesozoic Mammals: Monotremata, an Internet directory]
* [http://www.eurekalert.org/pub_releases/2005-02/uocm-pjr020805.php "Prehistoric jawbone reveals evolution repeating itself"] 10 February 2005


Wikimedia Foundation. 2010.

Игры ⚽ Нужно решить контрольную?

Look at other dictionaries:

  • Teinolophos — Zeitraum Unterkreide 115 Mio. Jahre Fundorte Flat Rocks, Victoria (Australien) Systematik Landwirbeltiere (Tetrapoda) …   Deutsch Wikipedia

  • Teinolophos — trusleri Teinolophos trusleri …   Wikipédia en Français

  • Teinolophos —   Teinolophos Rango temporal: Cretáceo Temprano Clasificación científica …   Wikipedia Español

  • Teinolophos trusleri — Teinolophos Zeitraum Unterkreide 115 Mio. Jahre Fossilfundorte Flat Rocks, Victoria (Australien) Systematik Säugetiere (Mammalia) Ursäuger (Protheria) …   Deutsch Wikipedia

  • Teinolophos trusleri — Teinolophos trusleri …   Wikipédia en Français

  • Evolution of mammals — Restoration of Thrinaxodon, a member of the cynodont group, which includes the ancestors of mammals Further information: Evolutionary history of life The evolution of mammals within the synapsid lineage (sometimes called mammal like reptiles )… …   Wikipedia

  • Evolution der Säugetiere — Thrinaxodon gehörte zur Gruppe der Cynodontier, der Vorfahren der Säugetiere Ausgangspunkt der Evolution der Säugetiere waren die Synapsiden – säugetierähnliche Reptilien. Die Entwicklung zu den echten Säugetieren war ein graduell verlaufender… …   Deutsch Wikipedia

  • Monotreme — Monotremes[1] Temporal range: 123–0 Ma …   Wikipedia

  • Evolution of mammalian auditory ossicles — The evolution of mammalian auditory ossicles is one of the most well documented[1] and important evolutionary events, demonstrating both numerous transitional forms as well as an excellent example of exaptation, the re purposing of existing… …   Wikipedia

  • Steropodontidae — Taxobox name = Steropodontidae image caption= Steropodon regnum = Animalia phylum = Chordata classis = Mammalia ordo = Monotremata familia = Steropodontidae familia authority = Archer, Flannery, Ritchie, Jones, 1995 subdivision ranks = Genera… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”