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Drytomomys aequatorialis

Mammalia - Rodentia - Dinomyidae

Taxonomy
Drytomomys aequatorialis was named by Anthony (1922). Its type specimen is AMNH 13219, a partial skeleton, and it is a 3D body fossil.

It was recombined as Olenopsis aequatorialis by Fields (1957).

Synonymy list
YearName and author
1922Drytomomys aequatorialis Anthony
1957Olenopsis aequatorialis Fields fig. 2
2015Drytomomys aequatorialis Tejada-Lara et al. p. 359

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
—Osteichthyes()
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
—Tetrapoda
—Reptiliomorpha
—Anthracosauria
subclassAmphibiosauriaKuhn 1967
—Cotylosauria()
—Amniota
subclassSynapsida
—Therapsida()
infraorderCynodontia()
—Mammaliamorpha
RankNameAuthor
—Mammaliaformes
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)
superfamilyChinchilloideaBennett 1833
familyDinomyidaePeters 1873
genusDrytomomysAnthony 1922
speciesaequatorialisAnthony 1922

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.

†Drytomomys aequatorialis Anthony 1922
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Diagnosis
ReferenceDiagnosis
R. W. Fields 1957General proportions robust; skull elongate, low parietals wide, flat; no sagittal crest; nasals evidently long, broad, expanding anteriorly; rostrum wide, high; premaxillary enlarged with buttress anterior to incisor; rostral masseteric fossa deep ventrally, anterior border somewhat squared, ventral margin bounded by ridge leading back to ventral zygomatic root; infraorbital foramen with slight ventral furrow; ventral zygomatic root opposite anterior margin of P4; upper incisors greatly long; cheek tooth series slightly longer than diastema; incisive foramen greatly enlarged, bounded by bony ridges continuing back to P4; tooth row convergent anteriorly; posterior palatine foramen continued forward as canal; basicranial axis elongate; interorbital region open as orbital fissure; auditory bullae moderately enlarged; external auditory meatus prominent, central opening below tubular part; stylomastoid foramen posterior to meatus; mastoid part of periootic oppressed to bulla; paraoccipital proccess oppressed to mastoid; foramen magnum low, wide; upper cheek teeth hypsodont, semi-rooted, labial surface with four superficial inflections, lingual surface with one long and one shorter inflections; M2 largest of upper molars; mandible massive; symphysis long, heavy; angle distorted outward; inferior pterygoid fossa deep posteriorly; mandibular masseteric fossa shallow; ventral mandibular crest with prominent anterior ridge; masseteric crest ovoid, depressed, below posterior moiety of p4; coronoid process reduced, distorted outward, opposite posterior moiety of m3; lower incisor extends into condyloid process, enamel face essentially flat; diastema short, approximately half as long as cheek-tooth series; lower cheek teeth with one labial inflection, three or rarely four, more superfitial lingual inflections; m1-2 with middle inflection longer than anterior or posterior, m3 with posterior inflection longer than, or equal to, middle inflection.
Measurements
partNmeanminimummaximummedians.d.
Astragalus head diameter48.417.0010.08.551.59
Calcaneum Olecranon diameter611.99.8015.511.42.04
Femur diameter218.715.522.619.15.02
Femur Head diameter215.213.217.415.32.97
Femur Neck diameter49.076.8012.39.052.42
Glenoid fossa diameter412.78.6019.312.64.49
Humerus diameter219.013.426.820.19.48
I1 diameter25.995.206.906.051.20
Mandible height324.419.029.825.55.44
Occiput height126.8----
Pelvis Acetabulum diameter215.313.417.415.42.83
Radius head diameter110.6----
Scapula neck diameter49.334.4018.59.705.90
Tibia diameter316.215.118.215.51.69
Tibia Head diameter421.818.925.021.93.35
i1 diameter66.334.709.805.951.90

Composition: phosphaticsubp
Environment: terrestrials
Locomotion: actively mobiles
Life habit: cursorials
Diet: frugivoref
Diet 2: folivoref
Reproduction: viviparoussubc
Created: 2012-10-19 06:16:00
Modified: 2012-10-18 14:16:00
Source: s = species, f = family, subc = subclass, subp = subphylum
References: Fields 1957, Lillegraven 1979, Carroll 1988, Nowak 1991

Age range: Laventan or 13.80000 to 11.00000 Ma

Collections (9 total)


Time interval Ma Country or state Original ID and collection number
Laventan13.8 - 11.0Colombia (Huila) Olenopsis aequatorialis (133692 134806 136233 187114 187115)
Laventan13.8 - 11.0Peru (Ucayali) Drytomomys aequatorialis (144793 144794)
Laventan13.8 - 11.0Colombia (Huila Department) Olenopsis aequatorialis (12971)
Laventan13.8 - 11.0Peru Drytomomys aequatorialis (107992)