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Heptodon
Taxonomy
Heptodon was named by Cope (1882). It was considered paraphyletic by Colbert (2005).
It was assigned to Lophiodontidae by Hay (1902), Scott (1913); to Helaletidae by Radinsky (1963); to Helaletinae by Radinsky (1966); to Tapiridea by Prothero and Schoch (1989); to Ceratomorpha by Cope (1882), Colbert and Schoch (1998); to Heptodontidae by Holbrook (1999); and to Tapiroidea by Hooker and Dashzeveg (2004), Colbert (2005).
It was assigned to Lophiodontidae by Hay (1902), Scott (1913); to Helaletidae by Radinsky (1963); to Helaletinae by Radinsky (1966); to Tapiridea by Prothero and Schoch (1989); to Ceratomorpha by Cope (1882), Colbert and Schoch (1998); to Heptodontidae by Holbrook (1999); and to Tapiroidea by Hooker and Dashzeveg (2004), Colbert (2005).
Synonymy list
| Year | Name and author |
|---|---|
| 1882 | Heptodon Cope |
| 1902 | Heptodon Hay p. 625 |
| 1913 | Heptodon Scott p. 291 |
| 1963 | Heptodon Radinsky p. 24 |
| 1966 | Heptodon Radinsky p. 633 |
| 1989 | Heptodon Prothero and Schoch p. 533 |
| 1998 | Heptodon Colbert and Schoch p. 573 |
| 1999 | Heptodon Holbrook p. 347 |
| 2004 | Heptodon Hooker and Dashzeveg p. 1377 |
| 2005 | Heptodon Colbert p. 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.
G. †Heptodon Cope 1882
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†Heptodon minimus Qi 1987
†Heptodon niushanensis Chow and Li 1965
†Heptodon tienshanensis Zhai 1978
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| L. B. Radinsky 1963 | Small to medium-sized helaletids. Canines relatively large. P1 simple; P2-4 non-molariform, with metaloph less prominent than protoloph and with only one lingual 1-2 cusp, a steeply conical protocone. M1-2 metacones slightly convex to flat; not shortened and not as lingually displaced as in later helaletids. M3 metacone not as reduced as in later helaletids. p1 usually present. p2 a high elongate cusp with small median posterior cuspule. p3-4 trigonids relatively high, with long paralophids. Small entoconid variably present on p4. Nasal incision not enlarged. |