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Macrochelys (alligator snapping turtle)

Reptilia - Testudines

Taxonomy
Macrochelys was named by Gray (1856) [Webb (1995; reference # 50687) demonstrated that Macrochelys is the senior synonym of Macroclemys and both were published in 1856 (not 1855 as commonly stated) [Richard Hulbert, Apr. 2014]]. It is extant. It was considered monophyletic by Thomas et al. (2014).

It was corrected as Macroclemys by Frank and Ramus (1996) and Anquetin et al. (2009).

It was assigned to Testudines by Anquetin et al. (2009); to Chelydridae by Cope (1875), Cope (1884), Hay (1908), Whetstone (1978), Carroll (1988), Frank and Ramus (1996), Knauss et al. (2011), Thomas et al. (2014) and van Dijk et al. (2014); and to Chelydridae by Joyce (2016).

Synonymy list
YearName and author
1856Macrochelys Gray
1875Macrochelys Cope p. 52
1884Macrochelys Cope
1908Macrochelys Hay p. 222
1978Macroclemys Whetstone p. 161
1988Macroclemys Carroll
1996Macroclemys Frank and Ramus
2009Macroclemys Anquetin et al.
2011Macrochelys Knauss et al.
2014Macrochelys Thomas et al.
2014Macrochelys van Dijk et al.
2016Macrochelys Joyce

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
RankNameAuthor
Anthracosauria
Batrachosauria()
Cotylosauria()
Amniota
Sauropsida
classReptilia
Testudinata(Oppel 1811)
orderTestudinesBatsch 1788
suborderCryptodira
Chelydroidea()
PanchelydridaeJoyce et al. 2004
Chelydridae()
genusMacrochelysGray 1856

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.

Diagnosis
ReferenceDiagnosis
O. P. Hay 1908Three or four additional, or supramarginal, scutes on each side. Orbits lateral. Tail with small scales inferiorly (Boulenger).
Measurements
partNmean

Composition: phosphaticsubp
Body part: carapacef
Adult length: 100 to < 1000f
Grouping: solitaryf
Environment: freshwaterf
Locomotion: actively mobilec
Life habit: aquaticf
Diet: piscivoref
Reproduction: oviparousf
Created: 2005-08-25 13:50:05
Modified: 2005-09-09 19:46:40
Source: f = family, c = class, subp = subphylum
References: Carroll 1988, Ernst and Barbour 1989, Hendy et al. 2009

Age range

Maximum range based only on fossils: base of the Hemingfordian to the top of the Rancholabrean or 20.43000 to 0.01200 Ma
Minimum age of oldest fossil (stem group age): 15.97 Ma

Collections (22 total)


Time interval Ma Country or state Original ID and collection number
Miocene23.03 - 5.333Germany (Bayern) Macrochelys mira (48512)
Hemingfordian20.43 - 15.97USA (Florida) Macrochelys sp. (18561)
Hemingfordian20.43 - 15.97USA (Nebraska) Chelydrops stricta (17904) Macroclemys schmidti (34754)
Barstovian15.97 - 13.6USA (Nebraska) Macroclemys sp. (18275 18284)
Early/Lower Barstovian15.97 - 13.6USA (Florida) Macrochelys sp. (18549)
Hemphillian10.3 - 4.9USA (Florida) Macroclemys auffenbergi (18560)
Late/Upper Hemphillian10.3 - 4.9USA (Nebraska) Macroclemys temmincki (18126)
Zanclean5.333 - 3.6USA (Florida) Macrochelys sp. (18535)
Blancan4.9 - 1.8USA (Florida) Macrochelys sp. (19752) Macroclemys sp. (113275) Macroclemys temmincki (19753 19764)
Blancan4.9 - 1.8USA (Kansas) Macroclemys temmincki (19940)
Irvingtonian1.8 - 0.3USA (Florida) Macrochelys sp. (20308 20403) Macroclemys temmincki (20400 20402)
Rancholabrean0.3 - 0.012USA (Florida) Macroclemys temmincki (20440)
Late/Upper Pleistocene (glacial)0.126 - 0.0117USA (Mississippi) Macrochelys temminckii (164396)
Late/Upper Pleistocene0.126 - 0.0117USA (South Carolina) Macrochelys sp. (188304)