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Metaxytherium floridanum

Mammalia - Sirenia - Dugongidae

Taxonomy
Metaxytherium floridanum was named by Hay (1922). Its type specimen is USNM 7221, a maxilla, and it is a 3D body fossil. Its type locality is Prairie Pebble Phosphate Co., which is in a Tortonian lagoonal sandstone in the Peace River Formation of Florida.

It was recombined as Felsinotherium floridanum by Simpson (1932) and Sherman (1952).

Sister species lacking formal opinion data
M. subappeninum

Synonyms
Synonymy list
YearName and author
1922Metaxytherium floridanum Hay p. 1
1930Metaxytherium floridanum Hay p. 656
1932Felsinotherium floridanum Simpson p. 447
1932Felsinotherium ossivallense Simpson p. 448 figs. Fig. 12
1952Felsinotherium floridanum Sherman p. 98
1971Metaxytherium ossivallense Reinhart
1974Metaxytherium floridanum Fondi and Pacini p. 45
1974Metaxytherium ossivallense Fondi and Pacini p. 45
1976Metaxytherium ossivalense Reinhart p. 199
1976Metaxytherium floridanum Reinhart p. 216
1988Metaxytherium floridanum Domning p. 399
1994Metaxytherium floridanum Domning p. 189
1996Metaxytherium floridanum Domning
2008Metaxytherium floridanum Domning
2014Metaxytherium floridanum Voss p. 91 figs. Figure 3
2018Metaxytherium floridanum Domning p. 250

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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()
RankNameAuthor
—Mammaliamorpha
—Mammaliaformes
classMammalia
—Theriamorpha(Rowe 1993)
—Theriiformes()
—Trechnotheria
—Cladotheria
—Zatheria
subclassTribosphenida()
subclassTheria
—Eutheria()
—Placentalia
—AfrotheriaStanhope et al. 1998
—Tethytheria
orderSirenia()
familyDugongidae
subfamilyHalitheriinae()
genusMetaxytherium
speciesfloridanum

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.

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Invalid names: Felsinotherium ossivallense Simpson 1932 [synonym]
Diagnosis
No diagnoses are available
Measurements
No measurements are available
Composition: phosphaticsubp
Environment: marinef
Locomotion: actively mobilec
Life habit: aquaticf
Diet: herbivoref
Reproduction: viviparousf
Created: 2005-06-08 10:11:09
Modified: 2005-06-08 12:11:09
Source: f = family, c = class, subp = subphylum
References: Carroll 1988, Hendy et al. 2009, Domning 1978, Nowak 1991

Age range: Early/Lower Clarendonian or 12.50000 to 9.40000 Ma

Collections (10 total)


Time interval Ma Country or state Original ID and collection number
Serravallian13.82 - 11.62USA (Virginia) Metaxytherium floridanum (126605)
Clarendonian12.5 - 9.4USA (Florida) Metaxytherium floridanum (18588)
Early/Lower Clarendonian12.5 - 9.4USA (Florida) Metaxytherium floridanum (18536)
Late/Upper Clarendonian12.5 - 9.4USA (Florida) Metaxytherium floridanum (18554)
Tortonian11.62 - 7.246USA (Florida) Metaxytherium floridanum (45476 type locality: 45479 90284)
Hemphillian10.3 - 4.9USA (Florida) Metaxytherium floridanum (18560 18581) Metaxytherium floridanum, Felsinotherium ossivallense (18565)