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Archaeomerycidae
Taxonomy
Archaeomerycidae was named by Simpson (1945).
It was assigned to Traguloidea by Vislobokova (2001); and to Ruminantia by Métais (2006).
It was assigned to Traguloidea by Vislobokova (2001); and to Ruminantia by Métais (2006).
Subtaxa
Synonymy list
| Year | Name and author |
|---|---|
| 1945 | Archaeomerycidae Simpson |
| 2001 | Archaeomerycidae Vislobokova p. S134 |
| 2006 | Archaeomerycidae Métais |
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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.
Fm. †Archaeomerycidae Simpson 1945
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| I. A. Vislobokova 2001 | Skull brachycephalic with very short snout. Sagittal, temporal, and occipital crests strong. Sagittal crest long. Temporal crests curved ante- riorly and joined close to coronal suture. Orbits small,. placed centrally, and closed posteriorly. Postorbital bar formed half of frontal and half of jugal. Parietal foram- ina small. Foramen ovale small, placed posteriorly. Mastoid exposure mainly lateral. Auditory bulla very small without contact with postglenoid process. Exter- nal meatus weakly developed. Stylohyoid vagina extremely shallow, very widely open posteriorly. Petro- sal small, short, and broad, set closer to horizontal plane than to parasagittal one, and pressed closely against basioccipital; anteroventral border of petrosal placed far from postglenoid process. Promontorium weak, short, corresponding to main whorl of cochlea. Fenestra vestibuli small. Tensor tympani fossa small and located posteriorly. Behind fenestrae vestibuli and cochleae, stapedial muscle fossa narrow. Epitympanic recess on petrosal. Lacrimal with small facial and orbital parts. Lacrimal foramen within orbit. Ethmoidal fissure small and triangUlar or absent. Nasals elongated, not projecting anteriorly above anterior opening of nasal cavity. Palate flattened. Median concavity of pal- ate a little behind M3. Posterior opening of infraorbital canal placed in maxilla. Anterior opening of nasal cav- ity ovoid in dorsal view. Angular process of mandible narrow and strongly projecting posteriorly. Upper inci- sors very small. Canines small and procumbent, lower canine spatulate. PI absent. Forelimbs shorter than hindlimbs. Radius and ulna, tibia and fibula, and central metapodials separate. Fibula strongly reduced but os malleolus incompletely developed. Astragalus elon- gated and tripulley, with nonparallel trochleae. Metapo- dials separate. Manus pentadactyl. Pes tetradactyl. |