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Diabolotherium
Taxonomy
Diabolotherium was named by Pujos et al. (2007). Its type is Diabolotherium nordenskioldi.
It was assigned to Megalonychidae by Pujos et al. (2007); and to Megatheriinae by Varela et al. (2019).
It was assigned to Megalonychidae by Pujos et al. (2007); and to Megatheriinae by Varela et al. (2019).
Species
D. nordenskioldi (type species)
Synonymy list
| Year | Name and author |
|---|---|
| 2007 | Diabolotherium Pujos et al. p. 183 figs. Figs 3–9, 10A–D, 11–14, 15G, N, 16H, 17, Appendix 1 |
| 2019 | Diabolotherium Varela et al. |
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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. †Diabolotherium Pujos et al. 2007
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†Diabolotherium nordenskioldi Pujos et al. 2007
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| F. Pujos et al. 2007 | Small-sized fossil sloth (half the size of the North American Megalonychidae Pliometanastes prostitus and similar to the West Indies form Parocnus browni); dentition: 5/4 quadrangular molariform teeth; first anterior molariform tooth (M1) slightly triangular with a mesial longitudinal groove (not caniniform as in other Megalonychidae); M2–M4 rectangular (as in Plio-Pleistocene Nothrotheriidae, probably by convergence, and not oval as in West Indies Megalocninae and Choloepodinae, North and Central American Megalonychidae), and anteroposteriorly compressed with lateral and mesial longitudinal grooves; M5 reduced, rectangular, and without longitudinal grooves; m1–m4 with longitudinal grooves on labial and lingual margins of m2–m4; stylohyal fossa lateroventrally inclined and anteroposteriorly extended; mandible with thin and prominent angular process well separated from condyloid process; slender humerus without entepicondylar foramen and with reduced deltopectoral crest; medial and lateral epicondyle and epicondylar crest less developed than in other Megalonychidae; ulnar trochlear notch proximolaterally to distomedially extended; radial notch markedly anterior and nearly in the same plane as the trochlear notch; ulnar diaphysis slightly sigmoid in lateral view (as in Hapalops); ulnar styloid process distomedially long and spatulate as in modern tree sloths; radial diaphysis medially concave in anterior view; scaphoid proximodistally compressed; Mc II–IV subequal in length, shortness, and robustness; ilium subparallel to sacral vertebrae (similar to Hapalops); shallow acetabular fossa; undifferentiated odontoid and discoid facets of astragalus; in distal view the angle between the astragalar odontoid and discoid facets is 160°; astragalar head medial to odontoid process; ectal facet L-shaped; sustentacular facet constituted by two parts arranged at right angles; calcaneum wing-shaped, dorsoplantarly flattened, with a dorsoplantar foramen on the anterior portion of its lat- eral margin; Mt III anteroposteriorly compressed and medial articular facet (for the Mt II?) posteromedial and plantarly inclined; lateral wing of Mt V extremely reduced. |
Measurements
No measurements are available
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| Source: f = family, subc = subclass, c = class, subp = subphylum | |||||
| References: Lillegraven 1979, Hendy et al. 2009, Nowak 1999, Ji et al. 2002, Carroll 1988 | |||||
Age range: base of the Late/Upper Pleistocene to the top of the Lujanian or 0.12900 to 0.01200 Ma
Collections (6 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Lujanian | Peru (Puno) | Megalonychidae sp. (145248) | |
| Lujanian | Peru (La Libertad) | D. nordenskioldi (145252) | |
| Late/Upper Pleistocene | Peru | D. nordenskioldi (212474 212476) D. sp. (212475) | |
| Late/Upper Pleistocene | Chile | D. nordenskioldi (225572) |