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- Q131338 subject Q6365883.
- Q131338 subject Q8789952.
- Q131338 subject Q8789966.
- Q131338 abstract "Steropodon galmani was a prehistoric species of monotreme, or egg-laying mammal, that lived during the middle Albian stage, about 105 million years ago, in the Lower Cretaceous period. It is thought to be the second-earliest known relative of the platypus. Steropodon is known only from a single opalised jaw with three molars, discovered at the Griman Creek Formation, Lightning Ridge, New South Wales, Australia, by brothers David and Alan Galman. It was a large mammal for the Mesozoic, being 40–50 cm long. The lower molars are 5–7 mm in length, with a width of 3–4 mm. A length of 1–2 cm is more typical for Mesozoic mammals. Also from Lightning Ridge is Kollikodon ritchiei.The molars "bear striking resemblance to the tribosphenic pattern characteristic of living therians..." (Pascual). However, there are also differences: there is no entoconid, and an absence of wear seems to suggest that the upper molars (as yet unknown) did not have a protocone, and so implying that there was a double origin of tribosphenic teeth, one group represented by the living placentals and marsupials, and the other group being the monotremes bearing 'pseudo-tribosphenic' teeth.Woodburne (2003, p. 212) reports that the holotype is a right mandible named AM F66763. The preserved molars are m1–m3. Page 237 includes: "In Steropodon, the mandibular canal suggests the presence of a bill, with a bill also known in Obdurodon dicksoni and Ornithorhynchus anatinus."A fine photo of the opalised lower jaw can be found on page 182 in:Mackness, Brian, Prehistoric Australia, Sydney, Golden Press, 1987.".
- Q131338 binomialAuthority Q7287872.
- Q131338 class Q7377.
- Q131338 family Q123509.
- Q131338 genus Q123509.
- Q131338 kingdom Q729.
- Q131338 order Q21790.
- Q131338 phylum Q10915.
- Q131338 thumbnail Steropodon_BW.jpg?width=300.
- Q131338 wikiPageWikiLink Q1001654.
- Q131338 wikiPageWikiLink Q1061403.
- Q131338 wikiPageWikiLink Q10915.
- Q131338 wikiPageWikiLink Q123509.
- Q131338 wikiPageWikiLink Q130942.
- Q131338 wikiPageWikiLink Q131179.
- Q131338 wikiPageWikiLink Q131958.
- Q131338 wikiPageWikiLink Q133044.
- Q131338 wikiPageWikiLink Q15343.
- Q131338 wikiPageWikiLink Q171058.
- Q131338 wikiPageWikiLink Q180284.
- Q131338 wikiPageWikiLink Q189218.
- Q131338 wikiPageWikiLink Q21790.
- Q131338 wikiPageWikiLink Q25336.
- Q131338 wikiPageWikiLink Q25833.
- Q131338 wikiPageWikiLink Q301728.
- Q131338 wikiPageWikiLink Q44626.
- Q131338 wikiPageWikiLink Q5479132.
- Q131338 wikiPageWikiLink Q5571835.
- Q131338 wikiPageWikiLink Q6365883.
- Q131338 wikiPageWikiLink Q7251953.
- Q131338 wikiPageWikiLink Q7287872.
- Q131338 wikiPageWikiLink Q729.
- Q131338 wikiPageWikiLink Q731182.
- Q131338 wikiPageWikiLink Q7377.
- Q131338 wikiPageWikiLink Q7432.
- Q131338 wikiPageWikiLink Q743334.
- Q131338 wikiPageWikiLink Q83222.
- Q131338 wikiPageWikiLink Q8789952.
- Q131338 wikiPageWikiLink Q8789966.
- Q131338 binomialAuthority "Archer, Flannery, Ritchie, & Molnar, 1985".
- Q131338 classis "Mammalia".
- Q131338 familia "†Steropodontidae".
- Q131338 genus "†Steropodon".
- Q131338 name "Steropodon".
- Q131338 ordo Q21790.
- Q131338 phylum Q10915.
- Q131338 regnum "Animalia".
- Q131338 type Animal.
- Q131338 type Eukaryote.
- Q131338 type Mammal.
- Q131338 type Species.
- Q131338 type Thing.
- Q131338 type Q19088.
- Q131338 type Q729.
- Q131338 type Q7377.
- Q131338 comment "Steropodon galmani was a prehistoric species of monotreme, or egg-laying mammal, that lived during the middle Albian stage, about 105 million years ago, in the Lower Cretaceous period. It is thought to be the second-earliest known relative of the platypus. Steropodon is known only from a single opalised jaw with three molars, discovered at the Griman Creek Formation, Lightning Ridge, New South Wales, Australia, by brothers David and Alan Galman.".
- Q131338 label "Steropodon".
- Q131338 depiction Steropodon_BW.jpg.
- Q131338 name "Steropodon".