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Merychyinae
Taxonomy
Merychyinae was named by Simpson (1945).
It was assigned to Merycoidodontidae by Simpson (1945), Schultz and Falkenbach (1947), Stevens and Stevens (1996), Parris and Grandstaff (2003), Stevens and Stevens (2007), Stevens et al. (2023).
It was assigned to Merycoidodontidae by Simpson (1945), Schultz and Falkenbach (1947), Stevens and Stevens (1996), Parris and Grandstaff (2003), Stevens and Stevens (2007), Stevens et al. (2023).
Synonymy list
| Year | Name and author |
|---|---|
| 1945 | Merychyinae Simpson p. 149 |
| 1947 | Merychyinae Schultz and Falkenbach p. 168 |
| 1996 | Merychyinae Stevens and Stevens p. 510 |
| 2003 | Merychyinae Parris and Grandstaff p. 63 |
| 2007 | Merychyinae Stevens and Stevens p. 165 |
| 2023 | Merychyinae Stevens et al. p. 31 |
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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. †Merychyinae Simpson 1945
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G. †Merychyus Leidy 1858
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Subg. †Merychyus (Metoreodon) Matthew and Cook 1909
†Merychyus arenarum Cope 1884
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Invalid names: Merychyus arenarum idahoensis Schultz and Falkenbach 1947 [invalid subgroup], Merychyus arenarum leptorhynchus Cope 1884 [invalid subgroup], Merychyus euryops Cope 1899 [synonym]
†Merychyus calaminthus Jahns 1940
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Invalid names: Merychyus crabilli Schultz and Falkenbach 1947 [synonym], Merychyus crabilli ziaensis Schultz and Falkenbach 1968 [synonym], Merychyus jahnsi Whistler 1967 [synonym]
†Merychyus relictus Matthew and Cook 1909
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Invalid names: Merychyus (Metoreodon) relictus fletcheri Schultz and Falkenbach 1947 [invalid subgroup]
†Merychyus verrucomalus Stevens 1970
Invalid names: Merychyus (Metoreodon) relictus taylori Schultz and Falkenbach 1947 [invalid subgroup], Metoreodon Matthew and Cook 1909 [synonym]
G. †Oreodontoides Thorpe 1921
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†Oreodontoides curtus Loomis 1924
†Oreodontoides oregonensis Thorpe 1921
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Invalid names: Desmatochoerus anthyonyi Schultz and Falkenbach 1968 [synonym]
G. †Paramerychyus Schultz and Falkenbach 1947
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†Paramerychyus harrisonensis Peterson 1907
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Invalid names: Merychyus siouxensis Loomis 1924 [synonym]
†Paramerychyus relictus Loomis 1924
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. B. Schultz and C. H. Falkenbach 1947 | Oreodonts of small to medium size; skulls mesocephalic; occipital region showing much variation with the supraoccipital wings in- corporated into a fan-shaped occipital; orbits large for size of skull; tendency for slight retraction of the nasals (anterior tip above C/); tympanic bulla well inflated and large, with a round to somewhat flattened inferior surface; teeth moderately large, brachyodont to subhypsodont (all the teeth in Merychyinae are in reality brachyodont, and the terms subhypsodont and brachyodont used in this paper are strictly comparative terms), premolars with simple to complicated patterns, the latter type found in the later Miocene species; PLP3 with anterior intermediate crest and Pa with posterior intermediate crest. | |
| M. S. Stevens et al. 2023 | Small size (the smallest known Mioceneoreodonts), with shortened faces, slightly retracted nasals, wideinflated braincase with low sagittal crests, delicate zygomaticarches, arched frontal profile, small facial vacuities, a broadshallow lacrimal fossa anterior to the orbit, which forms a flat-bottomed depression. They have greatly inflated auditory bullaewith a “swollen” external auditory meatus, which completelyfills the space between the postglenoid and paroccipitalprocesses. The bulla is an inflated, sac-like structure with aslightly convex or flattened ventral surface that has a slightanteromedial slope. They have a relatively broad and fan-shapedoccipital region. The dentition is characterized by a longer molarrow that becomes quite hypsodont in later forms, and reducedpremolars, small caniniform teeth, and relatively long, delicate,slender limbs compared to most other larger Miocene oreodonts. |