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Hyrachyidae

Mammalia - Perissodactyla - Hyrachyidae

Taxonomy
Hyrachyidae was named by Osborn (1892). It is not extant. Its type is Hyrachyus.

It was reranked as the subfamily Hyrachyinae by Hay (1902), Peterson (1919) and Radinsky (1966).

It was assigned to Hyracodontidae by Hay (1902) and Peterson (1919); to Helaletidae by Radinsky (1966); and to Rhinocerotoidea by Holbrook (1999).

Synonyms
  • Hyrachyus priscus was named by Douglass (1903). Its type specimen is CM 784, a partial skull (the greater part of the mandible with all the post-canines except P1 , the anterior part of the skull with incisors and premolars, and the atlas), and it is a 3D body fossil. Its type locality is Sage Creek Formation, which is in a Bridgerian terrestrial horizon in Montana.

    It was replaced with Hyrachyus douglassi by Wood (1934).
  • Hyrachyus douglassi was named by Wood (1934) [replacement for "H. priscus" Douglass 1903]. Its type specimen is CM 784 and is a 3D body fossil. Its type locality is Sage Creek Formation, which is in a Bridgerian terrestrial horizon in Montana.

    It was considered a nomen dubium by Radinsky (1967) and Radinsky (1967).
Synonymy list
YearName and author
1892Hyrachyidae Osborn
1902Hyrachyinae Hay p. 638
1903Hyrachyus priscus Douglass p. 156 figs. FIg. 2
1919Hyrachyinae Peterson p. 127
1934Hyrachyus douglassi Wood p. 208 figs. Figures 23 and 24
1966Hyrachyinae Radinsky p. 633
1999Hyrachyidae Holbrook p. 346

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
—Osteichthyes()
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
—Tetrapoda
—Reptiliomorpha
—Anthracosauria
subclassAmphibiosauriaKuhn 1967
—Cotylosauria()
—Amniota
subclassSynapsida
—Therapsida()
infraorderCynodontia()
—Mammaliamorpha
—Mammaliaformes
RankNameAuthor
classMammalia
—Theriamorpha(Rowe 1993)
—Theriiformes()
—Trechnotheria
—Cladotheria
—Zatheria
subclassTribosphenida()
subclassTheria
—Eutheria()
—Placentalia
—Boreoeutheria
—Laurasiatheria
—Scrotifera
—Euungulata
—Panperissodactyla
superorderPerissodactylamorpha
orderPerissodactyla()
—Tapiromorpha(Haeckel 1873)
—Ceratomorpha(Wood 1937)
superfamilyRhinocerotoidea
familyHyrachyidaeOsborn 1892
familyHyrachyidaeOsborn 1892

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

Fm. †Hyrachyidae Osborn 1892
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G. †Hyrachyus Leidy 1871
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†Hyrachyus crista Qi 1987
†Hyrachyus eximius Leidy 1871
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Invalid names: Hyrachyus hypostylus Wood 1934 [synonym], Hyrachyus imperialis Osborn et al. 1878 [synonym], Hyrachyus princeps Marsh 1872 [synonym], Metahyrachyus troxelli Wood 1934 [synonym]
†Hyrachyus lunanensis Huang and Qi 1982
†Hyrachyus metalophus Chow and Qi 1982
†Hyrachyus minor Huang and Qi 1982
†Hyrachyus modestus Leidy 1870
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Invalid names: Colonoceras agrestis Marsh 1873 [synonym], Ephyrachyus cristalophus Wood 1934 [synonym], Hyrachyus agrarius Leidy 1871 [synonym], Hyrachyus agrestis Leidy 1871 [synonym], Hyrachyus crassidens Osborn et al. 1878 [synonym], Lophiodon affinis Marsh 1871 [synonym], Lophiodon bairdianus Marsh 1871 [synonym], Metahyrachyus bicornutus Troxell 1922 [synonym]
†Hyrachyus nanus Marsh 1871
†Hyrachyus paradoxus Osborn 1878
†Hyrachyus tongi Huang and Wang 2002
Invalid names: Chasmotherium Rutimeyer [synonym], Colonoceras Marsh 1873 [synonym], Ephyrachyus Wood 1934 [synonym], Metahyrachyus Troxell 1922 [synonym]
G. †Subhyrachyus Gabunia 1999
Invalid names: Hyrachyus douglassi Wood 1934 [nomen dubium]
Diagnosis
No diagnoses are available