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Tapirus polkensis

Mammalia - Perissodactyla - Tapiridae

Taxonomy
Tapiravus polkensis was named by Olsen (1960). Its type specimen is FGS V-5941, a tooth (upper left P4), and it is a 3D body fossil. Its type locality is Agrico Pierce Mine, which is in a Hemphillian terrestrial horizon in Florida.

It was recombined as Tapirus polkensis by Hulbert (1999), Ferrero and Noriega (2007), Hulbert et al. (2009) and Hulbert (2010).

Sister species lacking formal opinion data

View classification of included taxa

Synonymy list
YearName and author
1960Tapiravus polkensis Olsen p. 164
1984Tapiravus polkensis Schoch p. 5
1999Tapirus polkensis Hulbert
2007Tapirus polkensis Ferrero and Noriega p. 508
2009Tapirus polkensis Hulbert et al. p. 241
2010Tapirus polkensis Hulbert p. 79

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
Batrachosauria()
Cotylosauria()
Amniota
Synapsida()
RankNameAuthor
Therapsida()
infraorderCynodontia()
Epicynodontia
infraorderEucynodontia
Probainognathia
Mammaliamorpha
Mammaliaformes
classMammalia
subclassTribosphenida()
infraclassEutheria()
Placentalia
orderPerissodactyla()
Tapiromorpha(Haeckel 1873)
Ceratomorpha(Wood 1937)
superfamilyTapiroideaGill 1872
familyTapiridae
genusTapirus
speciespolkensis()

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
R. M. Schoch 1984Largest known species of Tapiravus
R. C. Hulbert et al. 2009Smallest North American species of Tapirus, with linear skeletal and dental dimensions on average 15– 20% smaller than Tapirus terrestris and an estimated average mass of 125 kg. Skull has narrow lacrimal bone with broad, flattened posterior process; extensive but shallow meatal fossa on dorsal surface of frontal and nasal bones with well defined posterior and medial margins; dorsal table of frontal broad, flat, not swollen, and on same plane as nasals; low parasagittal ridges or sagittal crest; and large, triangular interparietal bone that fuses with supraoccipital in the subadult stage. Mandible has mental foramen located ventral to p2, vertically oriented ascending ramus, and short postcanine diastema. P1 highly variable in both relative width and development of lingual cusps; the majority of specimens have a single lingual cusp and lack a transverse loph. Protoloph of P2 relatively weak, ends low on ectoloph near parastyle. Upper premolars relatively broad; P3–M3 with tall, well separated protolophs and metalophs and large parastyles. Posterolabial cingula common on upper cheek teeth. Lower first incisor larger than i2; i2 much larger than i3. Lower premolars with complete hypolophids.
Measurements
No measurements are available
Composition: phosphaticsubp
Environment: terrestrialsubc
Locomotion: actively mobilec
Life habit: amphibiousg
Diet: browserg
Created: 2009-01-04 10:30:41
Modified: 2012-04-16 20:18:34
Source: g = genus, subc = subclass, c = class, subp = subphylum
References: MacFadden and Cerling 1996, Carroll 1988, Hendy et al. 2009, Ji et al. 2002

Age range: base of the Barstovian to the top of the Hemphillian or 15.97000 to 4.90000 Ma

Collections (12 total)


Time interval Ma Country or state Original ID and collection number
Miocene23.03 - 5.333USA (Florida) Tapirus polkensis (18500 18527)
Barstovian15.97 - 13.6USA (Nebraska) Tapiravus polkensis (18275 18442)
Hemphillian10.3 - 4.9USA (Florida) Tapiravus polkensis (type locality: 18502)
Late/Upper Hemphillian10.3 - 4.9USA (Florida) Tapirus polkensis (18532 18548 18573 18599 18603)
Late/Upper Hemphillian - Blancan10.3 - 1.8USA (Tennessee) Tapiravus polkensis (26574)
Zanclean5.333 - 3.6USA (Florida) Tapirus polkensis (18535)