Hadrocodium
| Script error: No such module "Automated taxobox". Temporal range: Sinemurian
<div style="position:absolute; height:100%; text-align:center; color:inherit; background-color:rgb(0,146,112); left:Expression error: Unexpected < operatorpx; width:Expression error: Unexpected < operatorpx;">O
<div style="position:absolute; height:100%; text-align:center; color:inherit; background-color:rgb(179,225,182); left:Expression error: Unexpected < operatorpx; width:Expression error: Unexpected < operatorpx;">S
<div style="position:absolute; height:100%; text-align:center; color:inherit; background-color:rgb(203,140,55); left:Expression error: Unexpected < operatorpx; width:Expression error: Unexpected < operatorpx;">D
<div style="position:absolute; height:100%; text-align:center; color:inherit; background-color:rgb(103,165,153); left:Expression error: Unexpected < operatorpx; width:Expression error: Unexpected < operatorpx;">C
<div style="position:absolute; height:100%; text-align:center; color:inherit; background-color:rgb(240,64,40); left:Expression error: Unexpected < operatorpx; width:Expression error: Unexpected < operatorpx;">P
<div style="position:absolute; height:100%; text-align:center; color:inherit; background-color:rgb(129,43,146); left:Expression error: Unexpected < operatorpx; width:Expression error: Unexpected < operatorpx;">T
<div style="position:absolute; height:100%; text-align:center; color:inherit; background-color:rgb(52,178,201); left:Expression error: Unexpected < operatorpx; width:Expression error: Unexpected < operatorpx;">J
<div style="position:absolute; height:100%; text-align:center; color:inherit; background-color:rgb(127,198,78); left:Expression error: Unexpected < operatorpx; width:Expression error: Unexpected < operatorpx;">K
<div style="position:absolute; height:100%; text-align:center; color:inherit; background-color:rgb(253,154,82); left:Expression error: Unexpected < operatorpx; width:Expression error: Unexpected < operatorpx;">Pg
<div style="position:absolute; height:100%; text-align:center; color:inherit; background-color:rgb(255,230,25); left:Expression error: Unexpected < operatorpx; width:Expression error: Unexpected < operatorpx;">N
~ | |
|---|---|
| Lua error in package.lua at line 80: module 'Module:InfoboxImage/data' not found. | |
Scientific classification 
| |
| Script error: No such module "Taxobox ranks".: | <div style="display:inline" class="script error: no such module "taxobox ranks".">Template:Taxon infoTemplate:Taxon italics |
| Binomial name | |
| Template:Taxon infoTemplate:Taxon italics | |
| Lua error in package.lua at line 80: module 'Module:InfoboxImage/data' not found. | |
Page Template:Taxobox/core/styles.css has no content.Template:Taxonbar/candidateTemplate:Speciesbox/parameterCheckScript error: No such module "Check for conflicting parameters".
Hadrocodium is an extinct genus of mammaliaform that lived during the Sinemurian stage of the Early Jurassic approximately 195 million years ago[1] in the Lufeng Formation in what is now the Yunnan province in south-western China[2] (Lua error: callParserFunction: function "#coordinates" was not found., paleocoordinates Lua error: callParserFunction: function "#coordinates" was not found.).[3] It contains a single species, H. wui, and is considered the closest relative of the class Mammalia.
The fossil of this mouse-like, paper-clip sized animal was discovered in 1985 but was then interpreted as a juvenile morganucodontid.[4] Hadrocodium remained undescribed until 2001; since then its large brain and advanced ear structure[5] have greatly influenced the interpretation of the earliest stages of mammalian evolution, as these mammalian characters could previously be traced only to some 150 million years ago.[6] Hadrocodium is known only from a skull Template:Cvt long, and its body would have measured Template:Cvt long in total and weighed up to Template:Cvt, making it one of the smallest Mesozoic mammaliaforms.[1][7][8] The specimen is thought to have been that of a mature adult.[9]
The name Hadrocodium alludes to its large cranial cavity,[10] deriving from the Greek word Script error: No such module "lang". (Template:Wikt-lang 'large, heavy, fullness')[4] and the Latin word Script error: No such module "Lang"., from Greek Script error: No such module "lang". (Template:Wikt-lang 'head [of a plant]').[11] The species name, wui, is the Latinized version of discoverer Xiao-Chun Wu's name.[2]
While initially suggested to have possessed a fully mammalian ear akin to those of modern mammals, a 2022 restudy suggested that it actually had a primitive mandibular middle ear similar to those of other primitive mammaliaforms.[9] In 2025, Tumelty and Lautenschlager examined the cranium and mandible of Hadrocodium in comparison with those of modern moles and shrews, and concluded that Hadrocodium might have fed on softer invertebrates and that it's probably not a fully fossorial animal.[12]
Phylogeny
Script error: No such module "Labelled list hatnote".
Script error: No such module "Clade".
- Phylogeny [13]
Script error: No such module "Clade".
See also
References
Page Template:Reflist/styles.css has no content.
- ^ a b Lua error in package.lua at line 80: module 'Module:Footnotes/anchor_id_list' not found.
- ^ a b Lua error in package.lua at line 80: module 'Module:Footnotes/anchor_id_list' not found.
- ^ Template:Paleodb. Retrieved April 2013.
- ^ a b Lua error in package.lua at line 80: module 'Module:Footnotes/anchor_id_list' not found.
- ^ Lua error in package.lua at line 80: module 'Module:Footnotes/anchor_id_list' not found.
- ^ Lua error in package.lua at line 80: module 'Module:Footnotes/anchor_id_list' not found.
- ^ Page Module:Citation/CS1/styles.css has no content.T. S. Kemp (2005). The Origin and Evolution of Mammals. Oxford University Press, USA. p. 183. ISBN 9780198507611. Retrieved 22 September 2022.
- ^ Page Module:Citation/CS1/styles.css has no content.Donald R. Prothero (November 15, 2016). The Princeton Field Guide to Prehistoric Mammals. Princeton University Press. p. 27. ISBN 9780691156828.
- ^ a b Page Module:Citation/CS1/styles.css has no content.Luo, Zhexi; Bhullar, Bhart-Anjan; Crompton, Alfred; Neander, April; Rowe, Timothy (2022). "Reexamination of the Mandibular and Dental Morphology of the Early Jurassic Mammaliaform Hadrocodium wui". Acta Palaeontologica Polonica. 67. doi:10.4202/app.00949.2021. ISSN 0567-7920.
- ^ Page Module:Citation/CS1/styles.css has no content.Luo, Z.-X. (2001). "A New Mammaliaform from the Early Jurassic and Evolution of Mammalian Characteristics". Science. 292 (5521): 1535–40. Bibcode:2001Sci...292.1535L. doi:10.1126/science.1058476. PMID 11375489. S2CID 8738213.
- ^ Lua error in package.lua at line 80: module 'Module:Footnotes/anchor_id_list' not found.
- ^ Page Module:Citation/CS1/styles.css has no content.Tumelty, M.; Lautenschlager, S. (2025). "Is cranial anatomy indicative of fossoriality? A case study of the mammaliaform Hadrocodium wui". The Anatomical Record. doi:10.1002/ar.25630. PMC 12329393. PMID 39853864.
- ^ Page Module:Citation/CS1/styles.css has no content.Close, Roger A.; Friedman, Matt; Lloyd, Graeme T.; Benson, Roger B.J. (2015). "Evidence for a mid-Jurassic adaptive radiation in mammals". Current Biology. 25 (16): 2137–2142. doi:10.1016/j.cub.2015.06.047. PMID 26190074.
Bibliography
Page Template:Refbegin/styles.css has no content.
- Page Module:Citation/CS1/styles.css has no content."Hadrocodium wui". Carnegie Museum of Natural History. 2001. Archived from the original on 2012-06-17. Retrieved 1 April 2013.
- Page Module:Citation/CS1/styles.css has no content."Tiny creature may be ancestor of all mammals". CNN. May 24, 2001. Archived from the original on 18 September 2009. Retrieved 1 April 2013.
- Page Module:Citation/CS1/styles.css has no content.Liddell, Henry George; Scott, Robert (1940). "A Greek–English Lexicon: κώδεια". Perseus Digital Library. Retrieved 1 April 2013.
- Page Module:Citation/CS1/styles.css has no content.Luo, Zhe-Xi; Crompton, Alfred W.; Sun, Ai-Lin (2001). "A New Mammaliaform from the Early Jurassic and Evolution of Mammalian Characteristics" (PDF). Science. 292 (5521): 1535–1540. Bibcode:2001Sci...292.1535L. doi:10.1126/science.1058476. PMID 11375489. S2CID 8738213. Archived from the original (PDF) on 2013-08-20.
- Page Module:Citation/CS1/styles.css has no content.Parsell, D.L. (May 24, 2001). "Tiny Fossil From Early Jurassic Fills New Niche in Mammal Evolution". National Geographic News. Archived from the original on August 13, 2001. Retrieved 1 April 2013.
- Page Module:Citation/CS1/styles.css has no content.Rowe, Timothy; Macrini, Thomas E; Luo, Zhe-Xi (May 2011). "Fossil Evidence on Origin of the Mammalian Brain". Science. 332 (955): 955–7. Bibcode:2011Sci...332..955R. doi:10.1126/science.1203117. PMID 21596988. S2CID 940501. (Supporting online material)
External links
Page Module:Side box/styles.css has no content.Page Template:Sister project/styles.css has no content.
- Page Module:Citation/CS1/styles.css has no content.Rowe, Timothy; Macrini, Thomas E; Luo, Zhe-Xi (2006). "Hadrocodium wui (On-line)". Digital Morphology at the University of Texas. Retrieved 1 April 2013. — 3D models from CT scans of the original fossil
- Palaeocritti - a guide to prehistoric animals
Lua error in package.lua at line 80: module 'Module:Navbox/configuration' not found. Script error: No such module "Taxonbar".
