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Scleromys colombianus
Discussion
Holotype: Incomplete right lower jaw with broken incisor, p4 to m3 in place; UCMP 37927 Paratype: Fragment of left ventral zygomatic root of maxillary with unerupted P4, M1 to M3 in place, and right M1; UCMP 40549
Taxonomy
Scleromys colombianus was named by Fields (1957). It is considered to be a form taxon. Its type specimen is UCMP 37927, a mandible, and it is a 3D body fossil.
Synonymy list
| Year | Name and author |
|---|---|
| 1957 | Scleromys colombianus Fields |
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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.
†Scleromys colombianus Fields 1957
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. W. Fields 1957 | Rostral part of skull elongate; rostral masseteric fossa shallow, anterior part somewhat squared, bounded by anterior and dorsal ridge; no accessory opening on maxillary for lacrymal duct; nassals straight, narrow; infraorbital foramen with ventral furrow for transmission of nerves; ventral root of zygomatic arch anterior to P4; upper incisor strongly convex; incisive foramen somewhat enlarged, evidently with bony ridges extending back to P4s; tooth row convergent anteriorly; posterior palatine foramen between M1s, elongate, continued forward as shallow furrow; cheek teeth hypsodont, semi-rooted with three superficial inflections on labial side, one long anterior and one shorter posterior inflection on lingual side; M2 largest in series; mandible heavy; angle distorted outward; inferior pterigoyd fossa deep, narrow, elongate; mandibular masseteric fossa shallow, smooth; ventral mandibular crest smooth, rounded; masseteric crest not prominent; diastema short; coronoid process low, distorted outward; lower incisor extends into condyloid process; lower cheek teeth with one long labial inflection, three superficial lingual inflections with middle inflection longer than anterior, posterior inflection shorter than middle inflection on p4 to m2, equal to or longer than middle inflection on m3; m3 largest of lower molars; p4 greatest anteroposterior diameter. |
Measurements
| part | N | mean | minimum | maximum | median | s.d. | |
|---|---|---|---|---|---|---|---|
| Astragalus diameter | 2 | 5.49 | 5.20 | 5.80 | 5.50 | 0.424 | |
| Calcaneum diameter | 4 | 5.00 | 4.00 | 6.40 | 4.95 | 1.01 | |
| Femur Neck diameter | 2 | 3.62 | 3.20 | 4.10 | 3.65 | 0.636 | |
| Femur shaft diameter | 6 | 7.82 | 5.80 | 9.50 | 7.70 | 1.36 | |
| Glenoid fossa diameter | 2 | 5.12 | 4.30 | 6.10 | 5.20 | 1.27 | |
| Mandible height | 1 | 14.7 | - | - | - | - | |
| Scapula neck diameter | 2 | 3.46 | 2.40 | 5.00 | 3.70 | 1.84 | |
| Tibia diameter | 6 | 7.35 | 6.80 | 7.80 | 7.45 | 0.459 |
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| Source: s = species, f = family, subc = subclass, c = class, subp = subphylum | |||||
| References: Carroll 1988, Lillegraven 1979, Nowak 1991, Walton 1997, Hendy et al. 2009 | |||||
Age range: base of the Late/Upper Miocene to the top of the Laventan or 11.60800 to 11.00000 Ma
Collections (15 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Laventan | Colombia (Huila) | Scleromys colombianus (133648 133689 133692 134806 136211 136233 145175 187078 187114 187116 195256) | |
| Laventan | Colombia (Huila Department) | Scleromys colombianus (12971) | |
| Laventan | Colombia (Tolima) | Scleromys colombianus (133780) | |
| Tortonian | Brazil (Acre) | Scleromys colombianus (55602) | |
| Late/Upper Miocene | Brazil | Scleromys colombianus (57989) |