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Leptomerycidae

Mammalia - Artiodactyla - Leptomerycidae

Synonymy list
YearName and author
1893Leptomerycidae Zittel
1908Leptomerycinae Matthew p. 561
1940Leptomerycinae Scott p. 537
1969Leptomerycidae Ferrusquia-Villafranca
1988Leptomerycidae Carroll
2001Leptomerycidae Vislobokova p. S134
2009Leptomerycidae Spaulding et al.

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
Batrachosauria()
Cotylosauria()
RankNameAuthor
Amniota
Synapsida()
Therapsida()
infraorderCynodontia()
Epicynodontia
infraorderEucynodontia
Probainognathia
Mammaliamorpha
Mammaliaformes
classMammalia
orderArtiodactyla()
Ruminantiamorpha
Ruminantia(Scopoli 1777)
Pecora()
familyLeptomerycidaeZittel 1893
familyLeptomerycidaeZittel 1893

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.

Diagnosis
ReferenceDiagnosis
I. A. Vislobokova 2001Skull with more enlarged brain- case than in archaeomerycids. Sagittal crest shorter than in archaeomerycids, lophiomerycids, and gelocids. Temporal crests fused much more posteriorly to coro- nal suture. Postorbital bar complete and forms half of frontal and half of jugal. Parietal foramen large, some- times double. Auditory bulla small, with medium-long external acoustic meatus. Stylohyoid vagina encroach- ing upon bulla with sharp lateral border. Mastoid expo- sure mainly on occipital surface. Mastoid foramen large and placed laterally. Foramen ovale slitlike, located posteriorly. Pterygoid canal present. Petrosal enlarged with ventral side sitting closer to horizontal plane than to parasagittal one; anteroventral border of petrosal laterally almost reaching the postglenoid fora- men. Promontorium well developed, as in tragulids. Fenestra vestibuli small. Stapedial muscle fossa oppo- site fenestra vestibuli. Epitympanic recess formed by petrosal, as in tragulids. Lacrimal with enlarged facial and orbital parts and with single lacrimal foramen within orbit, as in tragulids. Jugal with well-developed anterior process. Posterior opening of infraorbital canal between lacrimal and maxilla, as in tragulids. Ethmoi- dal fissure well developed. Nasals shorter than in archaeomerycids, not narrowed posteriorly. Median concavity of palate opposite posterior border of M3. Anterior opening of nasal cavity with projected anteri- orly nasals. Upper incisors absent. Lower iI enlarged, strongly procumbent. Upper canines reduced. P I absent. The p I present or lost. Odontoid process of axis
spout-like. Forelimbs much shorter than hindlimbs. Radius and ulna, tibia and fibula separate. Fibula reduced to separate proximal rudiment and malleolar bone. Manus tetradactyl. Metacarpals separate and arranged in paraxonic symmetry. Metatarsals III and IV form cannon bone with unclosed gully. Proximal splits of metatarsals II and V fused with cannon bone. Ecto- and mesocuneiforms fused. Entocuneiform separate. Astragalus of pecoran type with parallel trochleae.