| Basic info | Taxonomic history | Classification | Included Taxa |
| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Eoconodon hutchisoni
Taxonomy
Eoconodon hutchisoni was named by Clemens (2011). It is not extant. Its type specimen is UCMP 156108, a tooth (left M2 with maxillary frag).
Synonymy list
| Year | Name and author |
|---|---|
| 2011 | Eoconodon hutchisoni Clemens |
Is something missing? Join the Paleobiology Database and enter the data
|
|
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.
†Eoconodon hutchisoni Clemens 2011
show all | hide all
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| W. A. Clemens 2011 | Postcanine dentition of Eoconodon hutchisoni, where known, is smaller than that of E. coryphaeus or the observed ranges of variation slightly overlap (Table 1). Its postcanine dentition is larger than those of E. nidhoggi and E. ginibitohia but again a few observed ranges of variation slightly overlap. With the exception of the distinctly smaller p4s and m3s of E. hutchisoni, the other lower postcanines in the small sample of E. gaudrianus are either slightly smaller than or within the lower end of the observed range of variation of those of E. hutchisoni.
The P4 of Eoconodon hutchisoni differs from that of E. gaudrianus and the P4 tentatively referred to E. nidhoggi (UMVP 1475) in its significantly larger protocone that, particularly in comparison to E. gaudrianus, is more distinctly separated from the base of the paracone. P4s of E. hutchisoni have a small, metacone-like expansion on the posterior slope of the paracone, which is lacking in E. gaudrianus, and possibly E. nidhoggi, and the posterior margin of the ectocingulum is more rugose. Differing from M1s or M2s of E. nidhoggi in which the metacone is slightly smaller than the paracone, on M1s of E. hutchisoni these cusps are subequal while on M2s the metacone is the smaller cusp. On M1s of E. hutchisoni the postcingulum is broader than that of the M1s or M2s of E. nidhoggi and has a distinct hypocone. The metacone of M3 is much smaller than the paracone. A metaconule is present but the paraconule is either small or missing. Its trigon basin is divided by a low transverse crest. Precingulum and postcingulum are narrow and do not meet on the lingual face of the protocone. The protoconids of p4s of Eoconodon hutchisoni are not as distinctly canted posteriorly as those of E. gaudrianus, and, particularly, E. coryphaeus. The lengths of the m1s and m2s of E. hutchisoni are smaller than those of E. coryphaeus, greater than those of E. nidhoggi and E. ginibitohia, and overlap with those of E. gaudrianus (Table 1). In contrast to the other currently recog- nized species, the m3 of E. hutchisoni is distinctly shorter and narrower than m2. (Based on means, see Table 1, the crown length of m3 is 86% of that of m2 and the trigonid width of m3 is 84% of that of m2.) The m3 talonid is reduced in size relative to the trigonid, and on one specimen the talonid cusps are reduced to crenulations around the talonid basin. On m3s of E. hutchisoni the posterior slope of the hypoconulid is separated from the posterior root by a distinct notch, while in E. gaudrianus (e.g., AMNH 3400 and the fragmentary m3 of AMNH 58116) the posterior slope of the hypoconulid merges smoothly with the surface of the enlarged posterior root. |
Measurements
No measurements are available
|
|
||||
|
|
||||
|
|
||||
|
|
||||
| Source: f = family, subc = subclass, c = class, subp = subphylum | |||||
| References: Ji et al. 2002, Carroll 1988, Hendy et al. 2009, Tabuce et al. 2011, Lillegraven 1979 | |||||
Age range: Puercan or 66.00000 to 63.30000 Ma
Collections (9 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Pu3 | USA (Montana) | Eoconodon hutchisoni (14738 143205 218647) | |
| Puercan | USA (Montana) | Eoconodon hutchisoni (14799 140079 218648 218651 218655) Eoconodon sp. (14766) |