| Basic info | Taxonomic history | Classification | Included Taxa |
| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Taxonomy
Megapeomys was named by Fejfar et al. (1998). It is not extant.
It was assigned to Apeomyinae by Fejfar et al. (1998) and Morea and Korth (2002).
It was assigned to Apeomyinae by Fejfar et al. (1998) and Morea and Korth (2002).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1998 | Megapeomys Fejfar et al. p. 124 |
| 2002 | Megapeomys Morea and Korth p. 10 |
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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. †Megapeomys Fejfar et al. 1998
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†Megapeomys bobwilsoni Morea and Korth 2002
†Megapeomys lavocati Fejfar et al. 1998
†Megapeomys lindsayi Fejfar et al. 1998
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| O. Fejfar et al. 1998 | Eomyids of large size with two nearly symmetrical lobes on lower molars forming oval basins (with tranxverse axes) indicating the close relationship to the older ancestral genus Apeomys Fahlbusch, 1968. Apomorphic features showing relatively fast evolution include morphological changes in the dentition and in the alveolar pattern, and shape of mandible.
Lower dentition with barral shaped, relatively higher crowned, bilobed molars with slight cylindrodont tendency, an apparent trend in the Apeomyinae. The enamel wall thicken with progressive wear; the occlusal surfaces of lower teeth are concave, the buccal walls slightly higher than the lingual ones. The p4 and m1-3 consist of two oval, transverse lobes divided by a deep transverse valley (which represents syncline III). p4 is molariform to submolariform in shape. The mesial lobe includes metalophid and mesolophid joining protoconid and metaconid cusps (its central valley represents syncline II), and the distal lobe includes hypolophid and posterolophid with hypoconid and entoconid cusps (its central valley represents syncline IV). In general, the position of the inner oval bassins of the lobes is lingually shifted and the axes of the valleys and synclines are nearly transverse. There is no trace of the longitudinal (saggital) crest. The mandible displays an exceptionally long and narrow rostral part and diastema. The alveoli are strong and deep; p4 has one strong and long mesial root and two partially fused distal roots; m1 and m2 are four rooted, with two long and narrow mesial roots, while the wide distal root splits into two rootlets; m3 retains the eomyid pattern. The relatively high and narrow incisor has a smooth outer enamel surface without striae or longitudinal ridges. |
Measurements
No measurements are available
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| Source: o = order, subc = subclass, c = class, subp = subphylum | |||||
| References: Lillegraven 1979, Nowak 1999, Carroll 1988, Ji et al. 2002, Hendy et al. 2009 | |||||
Age range: MN 4 or 16.90000 to 15.97000 Ma
Collections (4 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Hemingfordian | USA (Nevada) | Eomyinae indet. (18962) | |
| Orleanian | Czech Republic (Ústí nad Labem) | M. lavocati (48173) | |
| MN 4 | Germany (Bavaria) | M. lavocati (28629) | |
| MN 4 | Czech Republic (Karlovy Vary) | M. lindsayi (68711) |