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Tapirus polkensis
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).
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
Synonymy list
| Year | Name and author |
|---|---|
| 1960 | Tapiravus polkensis Olsen p. 164 |
| 1984 | Tapiravus polkensis Schoch p. 5 |
| 1999 | Tapirus polkensis Hulbert |
| 2007 | Tapirus polkensis Ferrero and Noriega p. 508 |
| 2009 | Tapirus polkensis Hulbert et al. p. 241 |
| 2010 | Tapirus polkensis Hulbert p. 79 |
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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.
†Tapirus polkensis Olsen 1960
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. M. Schoch 1984 | Largest known species of Tapiravus | |
| R. C. Hulbert et al. 2009 | Smallest 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. |