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|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Promerycochoerus (Parapromerycochoerus) macrostegus
Mammalia - Artiodactyla - Merycoidodontidae
It was recombined as Promerycochoerus macrostegus by Douglass (1901), Thorpe (1921) and Thorpe (1924); it was recombined as Promerycochoerus (Parapromerycochoerus) macrostegus by Schultz and Falkenbach (1949); it was synonymized subjectively with Merycochoerus superbus by Lander (1998).
|Year||Name and author|
|1884||Merycochoerus macrostegus Cope p. 526|
|1901||Promerycochoerus macrostegus Douglass|
|1921||Promerycochoerus macrostegus Thorpe p. 226|
|1921||Promerycochoerus marshi Thorpe p. 236 figs. 4A, B|
|1924||Promerycochoerus macrostegus Thorpe|
|1949||Promerycochoerus (Parapromerycochoerus) macrostegus Schultz and Falkenbach p. 118 figs. 5-7, 11, 12|
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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.
|M. R. Thorpe 1921 (Promerycochoerus marshi)||Malar below orbit very wide and heavy; orbits small; lacrymal fossa'. deep; zygoma very heavy; nasals project to a point above the anterior portion of the canines; infra-orbital foramen above p4; masseteric fossæ. very deep; face narrowed in advance of the orbits more than in any other species; frontals flat and decurved above orbits; temporal ridges have their junction above a line through postglenoid processes, which is more posterior than in any other species of the genus; incisive foramina large and separated by a triangular wedge of the palate, the apex of which is close to the incisor border. In all the other species, the proximal sides of the foramina are parallel to the sagittal plane, instead of being markedly oblique as here.|
|C. B. Schultz and C. H. Falkenbach 1949||SKULL!Largest known form of the sub- genus but with somewhat less height than examples of P. (P.) macrostegus furlongi; nasals retracted for short distance; nasal- maxilla contact in region above posterior por- tion of P1 ; zygomatic arch with straight pos- terior border and not hooked as in examples of P. carrikeri; infraorbital foramen above re- gion of anterior portion of M 1 ; lacrimal fossa moderately small but deeper than in Promerycochoerus; bulla greatly compressed laterally; postglenoid process slightly longer than in examples of previously mentioned species; posterior palate projection extremely pro- duced beyond M1 similar to P. (Pseudopromerycochoerus).
MANDIBLE:Inferior border of ramus with abrupt downward curve below the last lobe of Ma.
.DENTITION:Longest series of subgenus; within the size range of P. carrikeri; inferior and superior premolars not crowded.
LIMBS:Similar to those of P. carrikeri.