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Calippus elachistus

Mammalia - Perissodactyla - Equidae

Taxonomy
Calippus (Calippus) elachistus was named by Hulbert (1988). Its type specimen is UF 32139, a mandible (R mandibular fragment with m2-m3), and it is a 3D body fossil.

It was recombined as Calippus elachistus by MacFadden (1998).

Synonymy list
YearName and author
1988Calippus (Calippus) elachistus Hulbert, Jr. p. 249 figs. 11 - 13
1998Calippus elachistus MacFadden p. 550

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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
—Mammaliaformes
classMammalia
RankNameAuthor
—Theriamorpha(Rowe 1993)
—Theriiformes()
—Trechnotheria
—Cladotheria
—Zatheria
subclassTribosphenida()
subclassTheria
—Eutheria()
—Placentalia
—Boreoeutheria
—Laurasiatheria
—Scrotifera
—Euungulata
—Panperissodactyla
superorderPerissodactylamorpha
orderPerissodactyla()
superfamilyEquoidea
familyEquidae
subfamilyEquinae
tribeEquini
genusCalippus()
specieselachistus()

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.

†Calippus elachistus Hulbert, Jr. 1988
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Diagnosis
ReferenceDiagnosis
R. C. Hulbert 1988Occlusal dimensions of cheekteeth much smaller than any o t h e r s p e c i e s o f CaltjJpus e x c e p t C. regulus; s l i g h t ly s m a l l e r o c c l u s a l dimensions in early to middle wear-stages and significantly smaller basal crown lengths than C. regulus. Protostylid reduced on p3-m3. Metaflexid and linguaflexid better developed and more persistent with wear than in C. regulus. Metastylid and hypoconulid not extremely elongated in early wear- stages on m1-m3. Ectoflexid reduced in depth on permanent and deciduous cheekteeth, generally not penetrating isthmus, except in heavily worn molars. Pli entoflexid absent on molars. Fossettes simple, without plications except in earliest wear-stages. Styles weak, but slightly stronger than those of C.
regulus. Pli caballin absent or vestigial. Hypoconal groove closed with onset of wear, persists as a lake until middle wear-stages on premolars; disappears in very early wear-stages of molars.
Measurements
No measurements are available
Composition: phosphaticsubp
Environment: terrestrialsubc
Locomotion: actively mobilec
Life habit: ground dwellingsubf
Diet: grazerg
Reproduction: viviparoussubc
Created: 2009-01-04 10:25:39
Modified: 2009-01-04 12:25:39
Source: g = genus, subf = subfamily, subc = subclass, c = class, subp = subphylum
References: Nowak 1991, MacFadden 1998, Hendy et al. 2009, Lillegraven 1979, MacFadden and Cerling 1996, Carroll 1988, Ji et al. 2002

Age range: base of the Hemphillian to the top of the Late/Upper Clarendonian or 10.30000 to 9.40000 Ma

Collections (6 total)


Time interval Ma Country or state Original ID and collection number
Miocene23.03 - 5.333USA (Florida) Calippus elachistus (18521)
Late/Upper Clarendonian12.5 - 9.4USA (Florida) Calippus elachistus (18554)
Tortonian - Zanclean11.62 - 3.6USA (Florida) Calippus elachistus (18568)
Hemphillian10.3 - 4.9USA (Florida) Calippus elachistus (18556) Calippus sp. (18560)
early Early Hemphillian - late Early Hemphillian10.3 - 4.9USA (Florida) Calippus elachistus (18539)