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Paramerychyus
Taxonomy
Paramerychyus was named by Schultz and Falkenbach (1947). Its type is Merychyus harrisonensis.
It was synonymized subjectively with Merycoides by Lander (1998).
It was assigned to Merychyinae by Schultz and Falkenbach (1947), Stevens and Stevens (2007) and Stevens et al. (2023).
It was synonymized subjectively with Merycoides by Lander (1998).
It was assigned to Merychyinae by Schultz and Falkenbach (1947), Stevens and Stevens (2007) and Stevens et al. (2023).
Synonymy list
| Year | Name and author |
|---|---|
| 1947 | Paramerychyus Schultz and Falkenbach p. 247 figs. 1, 9, 10, 14 |
| 2007 | Paramerychyus Stevens and Stevens p. 164 |
| 2023 | Paramerychyus Stevens et al. pp. 46 - 47 |
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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.
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 | SKULL: Small, ranging in basal length from 164 mm. to 170 mm.; mesocephalic; low and flat; occipital region somewhat fan-shaped; supraoccipital wings with slight posterior projection, but with tendency to form a fan-shaped region, but still retaining the curved notch below and to the side of the supraoccipital wings; exoccipital pits elongated instead of round as in Merychyus and Merychyus (Metoreodon); occipital area similar to that found in Oreodontoides, considerably less fan-shaped than in Merychyus and M. (Metoreodon) (see fig. 14); sagittal crest low; brain case well inflated and broad; frontals moderately wide; lacrimal fossa deep; prelacrimal vacuity present; infraorbital foramen above region of pa; nasals pointed anteriorly, widest portion at anterior nasal- maxilla contact; occipital condyles moderately small; paroccipital process very wide at base (actually a part of the somewhat fan-shaped postoccipital region) and perpendicular to longitudinal axis of skull, tapering to a triangular cross section; bulla well inflated with highest point at external side, sloping off internally as found in examples of Merychyus; postglenoid process moderately heavy and deep, cone-shaped or peg-shaped in outline (in Merychyus the postglenoid process is anteroposteriorly compressed with sloping external border).
MANDIBLE:Unknown. DENTITION: Brachyodont in comparison with examples of Merychyus; premolars not crowded; premolars with reduced anterior portion (in unworn specimens); a small incipient cusp on the interior-posterior portion of P2 and pa, LIMBS: Unknown. | |
| M. S. Stevens et al. 2023 | same as for species. [Medium-sized (M1-3 length = 43-50 mm) merychyines with relatively low-crowned cheek teeth compared to Merychyus] |
Measurements
No measurements are available
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| Source: f = family, o = order, subc = subclass, c = class, subp = subphylum | |||||
| References: Lander 1998, Nowak 1999, Carroll 1988, Lillegraven 1979, Hendy et al. 2009 | |||||
Age range: base of the Monroecreekian to the top of the Harrisonian or 26.30000 to 18.50000 Ma
Collections (14 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Monroecreekian | USA (South Dakota) | Merychyus siouxensis (17723) | |
| Monroecreekian - Harrisonian | USA (Nebraska) | Merychyus siouxensis (17704) | |
| Harrisonian | USA (Texas) | Phenacocoelus leptoscelos (17767) | |
| Harrisonian | USA (Nebraska) | Merychyus siouxensis (17733 17741 17843 28043) | |
| Harrisonian | USA (Wyoming) | Merychyus harrisonensis (17853) Merychyus siouxensis (17798 17801 17811) Merychyus siouxensis, P. harrisonensis (17794) | |
| Harrisonian | USA (Montana) | Merychyus siouxensis (17861) | |
| Harrisonian | USA (South Dakota) | Eporeodon relictus (17743) |