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Merycochoerinae

Mammalia - Merycoidodontidae

Synonymy list
YearName and author
1940Merycochoerinae Schultz and Falkenbach p. 216
1968Merycochoerinae Schultz and Falkenbach p. 366
1996Merycochoerinae Stevens and Stevens p. 510
2007Merycochoerinae Stevens and Stevens p. 163
2023Merycochoerinae Stevens et al. p. 76

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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
RankNameAuthor
—Mammaliaformes
classMammalia
—Theriamorpha(Rowe 1993)
—Theriiformes()
—Trechnotheria
—Cladotheria
—Zatheria
subclassTribosphenida()
subclassTheria
—Eutheria()
—Placentalia
—Boreoeutheria
—Laurasiatheria
—Scrotifera
—Euungulata
—Artiodactylamorpha
—Artiodactyla()
familyMerycoidodontidae
subfamilyMerycochoerinae
subfamilyMerycochoerinae

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.

Subfm. †Merycochoerinae Schultz and Falkenbach 1940
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G. †Hypsiops Schultz and Falkenbach 1950
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†Hypsiops brachymelis Douglass 1907
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Invalid names: Ticholeptus breviceps Douglass 1907 [synonym], Ticholeptus petersoni Loomis 1923 [synonym]
†Hypsiops latidens Douglass 1907
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Invalid names: Promerycochoerus pygmyus Loomis 1924 [synonym]
†Hypsiops rooneyi Schultz and Falkenbach 1950
G. †Merycochoerus Leidy 1858
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†Merycochoerus magnus Loomis 1924
†Merycochoerus matthewi Loomis 1924
†Merycochoerus pinensis Schultz and Falkenbach 1949
†Merycochoerus proprius Leidy 1858
Invalid names: Merycochoerus (Brachycrus) Matthew 1901 [invalid subgroup], Paracotylops Matthew 1901 [synonym]
G. †Submerycochoerus Schultz and Falkenbach 1950
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Invalid names: Pseudomesoreodon boulderensis Schultz and Falkenbach 1950 [synonym], Pseudomesoreodon rolli Schultz and Falkenbach 1950 [synonym]
Diagnosis
ReferenceDiagnosis
M. S. Stevens et al. 2023Medium to large-sized oreodonts, developing a deeply retracted narial notch and very broad narial opening, with a short, blunt nasal bone in the most derived species; the alveolar margin is rounded and very robust; the ventral part of the narial opening has coalesced to form a strong incisive margin (all features not found in Brachycrus). The facial region is convex (not concave as in Brachycrus) with a large, deep malar bone, making for a deep snout. The anterior surface of the premaxillae has no deep depression, as seen in Brachycrus.
Measurements
No measurements are available
Composition: phosphaticsubp
Environment: terrestrialo
Locomotion: actively mobilec
Life habit: ground dwellingf
Diet: herbivoref
Reproduction: viviparoussubc
Created: 2005-08-31 14:37:21
Modified: 2005-08-31 16:37:21
Source: f = family, o = order, subc = subclass, c = class, subp = subphylum
References: Carroll 1988, Hendy et al. 2009, Nowak 1999, Lillegraven 1979, Lander 1998

Age range: base of the Chattian to the top of the Middle Miocene or 28.10000 to 11.60800 Ma

Collections (49 total)


Time interval Ma Country or state Original ID and collection number
Geringian30.8 - 26.3USA (Nebraska) Megoreodon sp. (17721)
Geringian30.8 - 26.3USA (Oregon) Merycochoerus minor (17537)
Arikareean29.5 - 18.5USA (North Dakota) Merycochoerus sp. (17795)
Arikareean29.5 - 18.5USA (Wyoming) Hypsiops sp. (18927)
Arikareean29.5 - 18.5USA (Oregon) Hypsiops sp. (93080) Merycochoerus matthewi (188964 188965)
Arikareean29.5 - 18.5USA (Montana) Megoreodon sp. (17540 17543)
Chattian28.1 - 23.03USA (Oregon) Hypsiops sp. (17603 93079)
Monroecreekian - Harrisonian26.3 - 18.5USA (Oregon) Hypsiops sp. (17528)
Harrisonian24.8 - 18.5USA (Nebraska) Hypsiops brachymelis (17757) Merycochoerus magnus (17739) Merycochoerus matthewi (17738) Merycochoerus sp. (17809)
Harrisonian24.8 - 18.5USA (South Dakota) Merycochoerus matthewi (17749) Merycochoerus sp. (17752)
Harrisonian24.8 - 18.5USA (Wyoming) Merycochoerus matthewi (17793 17833 17839 17850) Ticholeptus petersoni (17853)
Harrisonian24.8 - 18.5USA (Montana) Hypsiops brachymelis, Pseudomesoreodon boulderensis, Pseudomesoreodon rolli (17810) Hypsiops brachymelis, Pseudomesoreodon rooneyi, Submerycochoerus bannackensis (17787) Ticholeptus breviceps (17861)
Harrisonian24.8 - 18.5USA (Oregon) Merycochoerus sp. (19037)
Early/Lower Miocene23.03 - 15.97USA (Colorado) Merycochoerus matthewi, Merycochoerus proprius (18978)
Early/Lower Hemingfordian20.43 - 15.97USA (Oregon) Hypsiops breviceps, Merycochoerus matthewi (17925) Merycochoerus magnus (167866)
Early/Lower Hemingfordian20.43 - 15.97Panama (Panama City) Merycochoerus matthewi (144879)
Early/Lower Hemingfordian20.43 - 15.97USA (Wyoming) Merycochoerus magnus (167862) Merycochoerus sp., Merycochoerus proprius (18882)
Early/Lower Hemingfordian20.43 - 15.97USA (Nebraska) Merycochoerus proprius (17898 17934 17940 17946 17947 17978) Merycochoerus sp. (17922 17927 18021)
Early/Lower Hemingfordian20.43 - 15.97Panama Merycochoerus sp. (18725)
Hemingfordian20.43 - 15.97USA (Colorado) Merycochoerus magnus (17964) Merycochoerus proprius (17965)
Hemingfordian20.43 - 15.97USA (Wyoming) Merycochoerus magnus (17886)
Hemingfordian20.43 - 15.97Canada (Saskatchewan) Merycochoerus proprius (17870)
Barstovian - Clarendonian16.3 - 9.4USA (Nebraska) Merycochoerus proprius (190543)
Middle Miocene15.97 - 11.608USA (Colorado) Merycochoerus matthewi (18976)