|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Mammalia - Artiodactyla - Merycoidodontidae
It was synonymized subjectively with Promerycochoerus hollandi by Thorpe (1937); it was recombined as Promerycochoerus (Pseudopromerycochoerus) minor by Schultz and Falkenbach (1949); it was recombined as Eporeodon minor by Lander (1998); it was recombined as Mesoreodon minor by Stevens and Stevens (1996), Tabrum and Nichols (2001) and Stevens and Stevens (2007).
|Year||Name and author|
|1903||Promerycochoerus minor Douglass|
|1924||Promerycochoerus pygmyus Loomis|
|1934||Eporeodon cheeki Schlaikjer|
|1934||Mesoreodon scotti Schlaikjer|
|1949||Promerycochoerus (Pseudopromerycochoerus) minor Schultz and Falkenbach p. 124 figs. 10, 12|
|1949||Mesoreodon cheeki Schultz and Falkenbach p. 135 figs. 7, 15, 17-19, 25|
|1954||Desmatochoerus (Paradesmatochoerus) grangeri Schultz and Falkenbach p. 194 figs. 8-11, 24-25|
|1954||Desmatochoerus (Paradesmatochoerus) monroecreekensis Schultz and Falkenbach p. 195 figs. 8 - 11|
|1954||Desmatochoerus (Paradesmatochoerus) wyomingensis Schultz and Falkenbach p. 199 figs. 8 - 11, 18|
|1954||Pseudodesmatochoerus wascoensis Schultz and Falkenbach p. 210 figs. 12 - 14|
|1961||Mesoreodon cheeki Black|
|1964||Desmatochoerus macrosynaphus Riel|
|1970||Promerycochoerus minor Macdonald|
|1996||Mesoreodon minor Stevens and Stevens|
|1998||Eporeodon minor Lander|
|1998||Eporeodon pygmyus Lander|
|2001||Mesoreodon minor Tabrum and Nichols|
|2007||Mesoreodon minor Stevens and Stevens p. 160|
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|C. B. Schultz and C. H. Falkenbach 1949 (Mesoreodon cheeki)||SKULL:Medium size, approximately equal to the average examples of M. chelonyx; lighter construction than that of M. megalodon sweeti; sagittal crest not so high as that of M. megalodon sweeti, but approximately equal to that of M. chelonyx; zygomatic arch light, approximately equal to that of M. chelonyx, but with posterior border not extending so far posteriorly as in M. megalodon sweeti; lacrimal fossa smaller and shallower than that in M. chelonyx; postglenoid process not so robust as in M. megalodon sweeti.
MANDIBLE: Similar to that of M. chelonyx; lighter then that of M. megalodon sweeti.
DENTITION:Length of dental series same as in M. chelonyx.
LIMBS: Equal in size to those of M. chelonyx, smaller than average examples of M. megalodon.
|C. B. Schultz and C. H. Falkenbach 1949||SKULL:Small, smallest known species of the subgenus; nasals slightly retracted; anterior nasal-maxilla contact above the region of P1; zygomatic arch light, extending posteriorly slightly beyond the postglenoid proc- ess; infraorbital foramen above posterior portion of P'; lacrimal fossa small and shallow; paroccipital process tapering rapidly downward; bulla of medium size, inflated, and suboval in outline; postglenoid process almost as wide laterally as anteroposteriorly and with a sloping external border.
MANDIBLE: Small; similar to that of examples of other species of the subgenus.
DENTITION: Series small, equal to that of P. (P.) minor pygmyus; smaller than in other species of the subgenus.
|C. B. Schultz and C. H. Falkenbach 1954 (Desmatochoerus (Paradesmatochoerus) grangeri)||SKULL: Medium size; longest known of subgenus; width similar to examples of D. (P.) monroecreekensis and D. (P.) wyomingensis, wider than those of D. sanfordi; submesocephalic; facial region longer than other ex- amples of subgenus; sagittal crest slightly higher than in other species of subgenus (not so high as examples of Desmatochoerus) ; exoccipital vacuities smaller and nasals with
more anterior retraction than in other species of subgenus; posterior portion of zygomatic arch robust, more so than in examples of D. (P.) monroecreekensis, infraorbital foramen above anterior portion of P 3 ; bulla with more lateral compression and posterior palate projecting more posteriorly than in other forms of subgenus.
MANDIBLE: Similar to those of other species of subgenus; postsymphysis below Pa; ascending ramus higher than in examples of D. (P.) wyomingensis.
DENTITION: Lighter than in other species of subgenus; superior series extending to the midline of orbit, not so far posteriorly as in other forms of subgenus.
LIMBS:Longer but similar to other examples of subgenus.
|C. B. Schultz and C. H. Falkenbach 1954 (Desmatochoerus (Paradesmatochoerus) monroecreekensis)||SKULL: Medium size [average examples equal in length to those of D. (P.) wyomingensis, slightly shorter than in D. (P.) grangeri]; more robust and wider than D. (P.) wyomingensis; submesocephalic; exoccipital vacuities intermediate in size between examples of D. (P.) wyomingensis and D. (P.) grangeri; anterior nasal-maxilla contact above P1; zygomatic arch moderately robust (lighter in female examples); infraorbital foramen above posterior portion of P3 to anterior portion of P4 ; paroccipital process more robust, bulla with less vertical height, and postglenoid process more massive and wider laterally than in D. (P.) wyomingensis.
MANDIBLE: Slightly more robust than in examples of D. (P.) wyomingensis; post-symphysis below posterior portion of Pa; ramus with tendency to be deeper below the anterior edge of Ma than later species.
DENTITION:Similar to examples of D. (P.) wyomingensis, lighter than in D. (P.) grangeri.
LIMBS: Similar to examples of D. (P.) wyomingensis; shorter than those of D. (P.) grangeri.
|C. B. Schultz and C. H. Falkenbach 1954 (Desmatochoerus (Paradesmatochoerus) wyomingensis)||SKULL: Approximately same length but narrower and lighter than examples of D. (P.) monroecreekensis, smaller than in the holotype of D. (P.) grangeri, larger than in D. (P.) sanfordi; dolichocephalic; exoccipital vacuities larger than in other known forms of subgenus; anterior nasal-maxilla contact above middle of P1 ; infraorbital foramen above pa; base of paroccipital process heavier, postglenoid process more robust, and bulla with greater vertical length than in examples of D. (P.) monroecreekensis.
MANDIBLE: Similar to examples of D. (P.) monroecreekensis, but lighter and with less depth below Ma; postsymphysis below P3.
DENTITION: Approximate size of examples of D. (P.) monroecreekensis; greater length and more robust than in D. (P.) grangeri and D. (P.) sanfordi.
LIMBS: Similar in size and form to exam- ples of D. (P.) monroecreekensis.
|C. B. Schultz and C. H. Falkenbach 1954 (Pseudodesmatochoerus wascoensis)||SKULL: Approximately same length as examples of P. hojfmani and P. milleri, larger than that of P. longiceps; mesocephalic, wider than other examples of genus; lower than in other species of genus, but not so low as examples of Mesoreodon (some of vertical compression of skull may be due to crushing); supraoccipital wings larger and with more lateral spread than in other species of genus; brain case inflated but slightly depressed; frontals wide; nasals more robust than usual in this genus, less anterior retraction than in P. hoffmani; anterior nasal-maxilla contact above anterior portion of P 1 ; less posterior rise of zygomatic arch than in other species of genus (arch incomplete); malar moderately deep below orbit; lacrimal fossa comparatively small but deep; occipital condyles more widely spread than in other species of genus; paroccipital process more massive and with less lateral compression than usual in this genus; bulla large, larger than in P. milleri, similar to that of P. hoffmani except for less lateral compression; postglenoid process robust; posterior palate projecting posteriorly beyond M 8 , not to extent found in the holotype of P. longiceps.
DENTITION: Series lighter than in examples of P. hoffmani and P. milleri, approximately equal to those of P. longiceps; series of less length than in two former species and longer than in latter.