|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Mammalia - Artiodactyla - Merycoidodontidae
|Year||Name and author|
|1893||Mesoreodon chelonyx Scott p. 661|
|1893||Mesoreodon intermedius Scott p. 661|
|1906||Mesoreodon chelonyx Douglass p. 566|
|1907||Eucrotaphus montanus Douglass p. 100|
|1907||Mesoreodon latidens Douglass p. 101 figs. Pl. 25|
|1924||Merycoides latidens Loomis|
|1924||Mesoreodon laticeps Loomis|
|1924||Eporeodon montanus Thorpe|
|1934||Merycoides latidens Schlaikjer|
|1937||Eporeodon montanus Thorpe|
|1937||Merycoides latidens Thorpe|
|1940||Mesoreodon danai Koerner|
|1940||Mesoreodon wheeleri Koerner|
|1940||Eporeodon montanus Scott p. 686|
|1949||Mesoreodon chelonyx Schultz and Falkenbach p. 140 figs. 15, 16, 18, 19, 26|
|1954||Desmatochoerus (Paradesmatochoerus) sanfordi Schultz and Falkenbach p. 197 figs. 8 - 11|
|1954||Subdesmatochoerus montanus Schultz and Falkenbach p. 220 figs. 19 - 21|
|1968||Eporeodon meagherensis Schultz and Falkenbach|
|1968||Paramerycoidodon meagherensis Schultz and Falkenbach|
|1996||Mesoreodon chelonyx Stevens and Stevens|
|1998||Eporeodon latidens Lander|
|2007||Mesoreodon chelonyx Stevens and Stevens p. 160|
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|W. B. Scott 1893||Metapodials rather short and stout, ungual phalanges trowel-shaped and pointed.|
|W. B. Scott 1893 (Mesoreodon intermedius)||Metapodials slender and elongate, and ungual phalanges like those of Merychyus.|
|C. B. Schultz and C. H. Falkenbach 1949||SKULL: Medium size, with average examples equal to those of M. cheeki; sagittal crest prominent, moderately high; nasals without noticeable anterior retraction; posterior border of zygomatic arch similar to that of M. ckeeki but not extending posteriorly so far as in M. megalodonor M. megalodon sweeti; infraorbital foramen above P4; lacrimal fossa larger and deeper than in examples of M. cheeki; occipital condyles moderately large (considerable individual variation) ; paroccipital process not so wide at base as that in examples of M. cheeki, but with same angular position to the bulla as in that species; bulla inflated, somewhat oblong anteroposteriorly; postglenoid process heavy and wider laterally than anteroposteriorly.
MANDIBLE:Similar in size and shape to examples of M. ckeeki.
DENTITION: Similar to that of M. cheeki; tendency for slight diastema between P1 and Pl (not a constant character).
LIMBS: Moderately short; shorter and lighter than those in Promerycochoerus;equal to examples of M. cheeki in size and construction.
|C. B. Schultz and C. H. Falkenbach 1954 (Desmatochoerus (Paradesmatochoerus) sanfordi)||SKULL: Small size (smallest known of subgenus); no facial vacuity; anterior nasal-maxilla contact above the posterior portion of P1; infraorbital foramen above P3; · post-glenoid process comparably robust, higher and with less steeply sloping external border than in examples of D. (P.) wyomingensis. (Occipital region, bulla, zygomatic arch, and nasals unknown.)
MANDIBLE:Similar to examples of D. (P.) wyomingensis except for smaller size; post-symphysis below anterior portion of Pa.
DENTITION: Smallest known series of subgenus.
LIMBS: Long and slender; shortest examples of subgenus.
|C. B. Schultz and C. H. Falkenbach 1954 (Subdesmatochoerus montanus)||SKULL: Largest known form of genus; smaller than examples of Desmatochoerus and Pseudodesmatochoerus, larger than those of Prodesmatochoerus; sagittal crest light, high, and arched (more so than in examples of S. shannonensis), posterior portion slightly de- pressed; exoccipital vacuities larger than in S. socialis; nasals moderately light; zygomatic arch with more abrupt posterior rise than examples of S. shannonensis, more like those in S. socialis; malar deeper below orbit than in S. shannonensis; infraorbital foramen above P4 ; lacrimal fossa moderately large, very deep; slight depression posterior to infraorbital foramen; paroccipital process mod- erately light at base, with moderately down ward tapering, long axis of base paralleling longitudinal axis of skull; paroccipital process on external side of posterior portion of bulla (not directly posterior to bulla as in other examples of genus); bulla inflated, compressed laterally (similar, but larger than in examples of S. socialis dakotensis); post-glenoid process robust, wider than that in last-mentioned subspecies; posterior palate projecting farther posteriorly than in other forms of genus (palatal area partially restored in holotype).
MANDIBLE: More robust and deeper than in examples of S. shannonensis (more like examples of Desmatochoerus from the Gering) ; inferior border of ramus arched, somewhat like those of Brachycrus but shallower anteriorly; ascending ramus high, wide anteroposteriorly; condyle large and moderately robust.
DENTITION: Series more robust and of greater length than in examples of S. shannonensis; premolars crowded; p1-p3 and Pr P3 each set at angle to alveolar border; posterior external style of M3 more prominent than in other species of genus; P2 and P3 with anterior intermediate crest (P 1 may have crest, but not present on well-worn P1 of holotype).