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Ricardomys longidens

Osteichthyes - Rodentia - Echimyidae

Discussion

As for the genus: Small echymid rodent with three-crested, sigma-shaped lower molars. Mesodont. Molars long for their width. Mesoflexid, metaflexid from long, wide valleys, extending 2/3 transverse width tooth. Hypoflexid short. Flat bottoms reentrant. Antero-and posterolophids isolated when unworn, with wear connect by narrow bridges to ectolophulid and protolophid respectively. Hypolophulid reduced, posterolophid short. Mesoflexid merged with portoflexid. Hypoflexid transversely oriented. dp4 protoflexid shallow.

Taxonomy
Ricardomys longidens was named by Walton (1990) [Etymology: longidens in reference to the length and slenderness of the tooth row]. Its type specimen is IGM-DU 87-228, a mandible (Juvenile left mandible with dp4-m2), and it is a 3D body fossil. It is the type species of Ricardomys.

Synonymy list
YearName and author
1990Ricardomys longidens Walton

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
classOsteichthyes
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
—Tetrapoda
—Reptiliomorpha
—Anthracosauria
subclassAmphibiosauriaKuhn 1967
—Cotylosauria()
—Amniota
subclassSynapsida
—Therapsida()
infraorderCynodontia()
—Mammaliamorpha
—Mammaliaformes
RankNameAuthor
classMammalia
—Cladotheria
—Zatheria
subclassTribosphenida()
subclassTheria
—Eutheria()
—Placentalia
—Boreoeutheria
—EuarchontogliresMurphy et al. 2001
—GliriformesWyss and Meng 1996
—Glires()
—Simplicidentata()
orderRodentiaBowdich 1821
—CtenohystricaHuchon et al. 2000
infraorderHystricognathi(Tullberg 1899)
—Caviomorpha(Wood and Patterson 1955)
superfamilyOctodontoideaWaterhouse 1839
familyEchimyidaeGray 1825
subfamilyAdelphomyinae
genusRicardomys
specieslongidens

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.

†Ricardomys longidens Walton 1990
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Diagnosis
ReferenceDiagnosis
A. H. Walton 1990As for the genus: Small echymid rodent with three-crested, sigma-shaped lower molars. Mesodont. Molars long for their width. Mesoflexid, metaflexid from long, wide valleys, extending 2/3 transverse width tooth. Hypoflexid short. Flat bottoms reentrant. Antero-and posterolophids isolated when unworn, with wear connect by narrow bridges to ectolophulid and protolophid respectively. Hypolophulid reduced, posterolophid short. Mesoflexid merged with portoflexid. Hypoflexid transversely oriented. dp4 protoflexid shallow.
Measurements
partNmean
Jaw at m1 height16.50
Lower dp4 height10.520
Lower m1 height10.560
Lower m2 height10.800

Composition: phosphaticsubp
Maximum body mass: 250 gs
Minimum body mass: 150 gs
Body mass source: publisheds
Environment: terrestrials
Locomotion: actively mobilec
Life habit: scansorialf
Diet: herbivoref
Reproduction: viviparoussubc
Created: 2013-05-30 04:06:36
Modified: 2013-05-29 13:06:36
Source: s = species, f = family, subc = subclass, c = class, subp = subphylum
References: Nowak 1991, Carroll 1988, Lillegraven 1979, Walton 1997, Hendy et al. 2009

Age range: base of the Laventan to the top of the Serravallian or 13.80000 to 11.63000 Ma

Collections (3 total)


Time interval Ma Country or state Original ID and collection number
Serravallian13.82 - 11.63Peru (San Martin) Ricardomys longidens (230802)
Laventan13.8 - 11.0Colombia (Huila) Ricardomys longidens (141256 195251)