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Juxia

Description

Juxia is an extinct genus of indricothere, a group of herbivorous mammals that are part of the odd-toed ungulate family tree of rhinoceros and tapirs. The type species is Juxia sharamurenense, named by Chow and Chiu in 1964. Juxia was around the size of a horse. It lived in Asia during the upper Eocene. As an early indricothere, Juxia had a relatively light body, held by elongated long legs and small skull firmly attached to a relatively long neck. Based on its triangular like teeth and sharp protruding incisors, Juxia was probably a strict browser, feeding on ferns and leaves on branches where most herbivorous mammals couldn't reach. In terms of habitat, Juxia lived in densely lush and tropical forests of what is now China. Though a few skeletons have been found, it is unclear whether this early indricothere was permanently solitary or lived in small social groups, possibly harems. Based on its morphology, Juxia's long legs probably enabled it to run relatively fast for a limited duration. This was probably a defense mechanism against early mammalian predators.


Source Data
SourceIDLink
Global Biodiversity Information Facility ID (GBIF)4830357https://www.gbif.org/species/4830357
PaleoBioDB ID (PBDB)43159https://paleobiodb.org/classic/checkTaxonInfo?taxon_no=43159
Rankgenus
Taxonomy (GBIF)Life : Animalia : Chordata : Mammalia : Perissodactyla : Juxia
Taxonomy (PBDB)Life : Animalia : Chordata : Mammalia : Perissodactyla : Paraceratheriidae : Juxia
Taxonomic Status (GBIF)accepted
Classification
(PBDB,GBIF)
RankNameAuthor
-Eukaryota
-OpisthokontaCavalier-Smith 1987
kingdomAnimalia
-TriploblasticaLankester 1877
-NephrozoaJondelius et al. 2002
-DeuterostomiaGrobben 1908
phylumChordataHaeckel 1847
subphylumVertebrataLamarck 1801
superclassGnathostomataGegenbauer 1874
-Osteichthyes
-SarcopterygiiRomer 1955
subclassDipnotetrapodomorpha
subclassTetrapodomorpha
-Tetrapoda
-ReptiliomorphaSäve-Söderbergh 1934
-AnthracosauriaSäve-Söderbergh 1934
-Batrachosauria
-Cotylosauria
-AmniotaHaeckel 1866
-SynapsidaOsborn 1903
-Therapsida
infraorderCynodontia
-EpicynodontiaHopson and Kitching 2001
infraorderEucynodontiaKemp 1982
-ProbainognathiaHopson 1990
-MammaliamorphaRowe 1988
-MammaliaformesRowe 1988
classMammaliaLinnaeus 1758
subclassTribosphenida
infraclassEutheria
-PlacentaliaOwen 1837
orderPerissodactyla
-Tapiromorpha
-Ceratomorpha
superfamilyRhinocerotoideaGray 1821
familyParaceratheriidaeOsborn 1923
subfamilyParaceratheriinaeOsborn 1923
genusJuxiaChow & Chiu 1964
Scientific NameJuxia Chow & Chiu, 1964
Name Published InVertebr. palasiat. 8
Opinions (PBDB)
NameRankOpinionEvidenceAuthor
Juxiagenusbelongs to Hyracodontidaestated with evidenceRadinsky, 1966
Juxiagenusbelongs to HyracodontidaeimpliedCarroll, 1988
Juxiagenusbelongs to Indricotheriinaestated without evidenceProthero and Schoch, 1989
Juxiagenusbelongs to Alloceropinaestated without evidenceDashzeveg, 1996
Juxiagenusbelongs to Rhinocerotoideastated with evidenceHolbrook, 1999
Juxiagenusbelongs to Paraceratheriinaestated with evidenceQiu and Wang, 2007
Status (PBDB)extinct
Taxon Size (PBDB)4
First Recorded Appearance48.6 - 37.2 Ma
Eocene
Last Recorded Appearance37.2 - 33.9 Ma
Paleogene
Environmentterrestrial (based on Eutheria)
Motilityactively mobile (based on Osteichthyes)
Dietbrowser (based on Ceratomorpha)
Taphonomyphosphatic (based on Vertebrata)
Primary Reference (PBDB)M. Chow and C.-S. Chiu. 1964. An Eocene Giant Rhinoceros. Vertebrata PalAsiatica 8(3):264-267
Wikipediahttps://en.wikipedia.org/wiki/Juxia

Fossil Distribution

Subtaxa

NameStatusCommon Name(s)Fossil OccurrencesOldestYoungest
Imequincisoria micracis
species
accepted (GBIF)No associated record in PBDB
Juxia micracis
species
listed (PBDB)148.6 Ma
Eocene
48.6 Ma
Eocene
Juxia sharamurenense
species
accepted (GBIF)No associated record in PBDB
Juxia sharamurenensis
species
listed (PBDB)348.6 Ma
Eocene
37.2 Ma
Eocene
Juxia shoui
species
accepted (GBIF)
listed (PBDB)
237.2 Ma
Eocene
37.2 Ma
Eocene

Synonymy List

YearName and Author
1964Juxia Chow and Chiu
1966Juxia Radinsky p. 635
1976Imequincisoria Wang
1977Guixia You
1988Guixia Carroll
1988Imequincisoria Carroll
YearName and Author
1988Juxia Carroll
1989Juxia Prothero and Schoch p. 534
1996Juxia Dashzeveg p. 9
1999Juxia Holbrook p. 346
2007Juxia Qiu and Wang
2016Juxia Wang et al.

References

Chow M., Chiu C.-S. (1964) An Eocene Giant Rhinoceros, Vertebrata PalAsiatica 8 3, 264-267
Radinsky L. B. (1966) The families of the Rhinocerotoidea (Mammalia, Perissodactyla), Journal of Mammalogy 47 4, 631-639
Wang J. (1976) A New Genus of Forstercooperiinae from the Late Eocene of Tongbo, Henan, Vertebrata PalAsiatica 14 2, 104-111
Carroll R. L. (1988) , Vertebrate Paleontology and Evolution, 1-698
Prothero D. R., Schoch R. M. (1989) Origin and evolution of the Perissodactyla: Summary and Synthesis, The Evolution of Perissodactyls, 530-529
Dashzeveg D. (1996) A new hyracodontid (Perissodactyla, Rhinocerotoidea) from the Ergilin Dzo Formation (Oligocene, Quarry 1) in Dzamyn Ude, Eastern Gobi Desert, Mongolia, American Museum Novitates 3178, 1-12
Holbrook L. T. (1999) The Pphylogeny and classification of tapiromorph perissodactyls (Mammalia), Cladistics 15 3, 331-350
Qiu Z., Wang B. (2007) Paracerathere Fossils of China, Palaeontologia Sinica, New Series C 193 29, 1-396
Wang H., Bai B., et al (2016) Earliest known unequivocal rhinocerotoid sheds new light on the origin of Giant Rhinos and phylogeny of early rhinocerotoids, Scientific Reports 6, 39607:1-9
Nomenclator Zoologicus. A list of the names of genera and subgenera in zoology from the tenth edition of Linnaeus, 1758 to the end of 2004. Digitised by uBio from vols. 1-9 of Neave (ed.), 1939-1996 plus supplementary digital-only volume. http://ubio.org/NomenclatorZoologicus (as at 2006). - via The Interim Register of Marine and Nonmarine Genera
as per family - via The Interim Register of Marine and Nonmarine Genera
Vertebr. palasiat. 8 - via The Interim Register of Marine and Nonmarine Genera
Data courtesy of: PBDB: The Paleobiology Database, Creative Commons CC-BY licenced. , GBIF: the Global Biodiversity Information Facility, various licences, iDigBio, various licences, and EOL: The Encyclopedia of Life (Open Data Public Domain). Because fossils are made of minerals too!
 
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