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Arazamys
Taxonomy
Arazamys was named by Rinderknecht et al. (2011). Its type is Arazamys castiglionii.
It was assigned to Eumegamyinae by Rinderknecht et al. (2011).
It was assigned to Eumegamyinae by Rinderknecht et al. (2011).
Species
A. castiglionii (type species)
Synonymy list
| Year | Name and author |
|---|---|
| 2011 | Arazamys Rinderknecht et al. p. 170 figs. 2, 6 |
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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. †Arazamys Rinderknecht et al. 2011
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†Arazamys castiglionii Rinderknecht et al. 2011
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. Rinderknecht et al. 2011 | Large member of Eumegamyinae, bigger than Phoberomys (Neoepiblemidae) but somewhat smaller than the largest representatives of the Dinomyidae (genus Isostylomys and Josephoartigasia), characterized by having P4, M1, and M2 composed of 5 transverse lophs of which the first 2 (anterior ones) remain free and the 3 posterior ones are joined together on the lingual (internal) side. It differs from all species of Isostylomys by having P4 with the last 3 lophs jointed. Also, it differs from Eumegamys and Pentas- tylodon by having M1 composed of 5 lophs (4 in Eumegamys and 6 in Pentastylodon) and from Eumegamysops by having M2 composed of 5 lophs. Arazamys is the only member of the Eumegamyinae that bears a M3 composed of 5 lophs with the last 2 of them joined together (3 united in Pentastylodon).
Auditory region characterized by a short meatus acusticus externus (like Eumegamysops and Eumegamys and different from J. monesi), with a foramen stylomastoideum located below it and a well-developed ectotympanic cavity. |
Measurements
No measurements are available
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| Source: f = family, subc = subclass, c = class, subp = subphylum | |||||
| References: Carroll 1988, Hendy et al. 2009, Nowak 1991, Lillegraven 1979, Ji et al. 2002 | |||||
Age range: Late/Upper Miocene or 11.60800 to 5.33300 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Miocene | Uruguay (San Jose) | A. castiglionii (152542) |