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Echmatemys

Reptilia - Testudines - Geoemydidae

Synonyms
Synonymy list
YearName and author
1871Palaeotheca polycypha Cope p. 463
1871Palaeotheca terrestris Cope p. 464
1873Emys polycypha Cope
1873Emys terrestris Cope
1884Emys polycypha Cope
1884Emys terrestris Cope
1902Emys polycypha Hay p. 448
1902Emys terrestris Hay p. 448
1906Echmatemys Hay p. 27
1915Echmatemys Gilmore p. 123
1915Echmatemys depressa Gilmore p. 139 figs. 2; 16
1988Echmatemys Carroll
1992Echmatemys Hutchison
1996Echmatemys Hutchison p. 340
2001Echmatemys Holroyd et al.
2004Echmatemys Hervet
2012Echmatemys Claude et al.
2015Echmatemys Lichtig and Lucas
2018Echmatemys Vlachos

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda
Reptiliomorpha
Anthracosauria
RankNameAuthor
Batrachosauria()
Cotylosauria()
Amniota
Sauropsida
classReptilia
Testudinata(Oppel 1811)
orderTestudinesBatsch 1788
suborderCryptodira
Pantestudinoidea
superfamilyTestudinoidea
Pangeoemydidae
familyGeoemydidaeTheobald 1868
genusEchmatemys

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
E. Vlachos 2018Echmatemys can be diagnosed as a member of Geoemydidae based on by the presence of musk ducts and associated musk duct foramina, wide rib heads, a narrow costo-vertebral tunnel, and paired marginals XII that expand on the suprapygal II. Echmatemys differs from other Geoemydidae based on the presence of narrow triturating surfaces, a short cervical scute, mostly hexagonal neurals II–VIII with short antero-lateral sides, a posteriorly flared carapace margin, anals that are shorter medially than the femorals, and well-developed axillary and inguinal buttresses.
Measurements
No measurements are available
Composition: phosphaticsubp
Entire body: yesg
Adult length: 100 to < 1000g
Environment: freshwaterg
Locomotion: actively mobilec
Life habit: aquaticg
Diet: herbivoreg
Reproduction: oviparoussubo
Comments: "omnivorous or more likely herbivorous" length is about 350 mm based on text figureg
Created: 2006-04-19 14:59:48
Modified: 2006-04-19 17:05:43
Source: g = genus, subo = suborder, c = class, subp = subphylum
References: Uetz 2005, Carroll 1988, Holroyd et al. 2001, Hendy et al. 2009

Age range: base of the Lysitean to the top of the Chadronian or 55.80000 to 33.90000 Ma

Collections (75 total)


Time interval Ma Country or state Original ID and collection number
Lostcabinian55.8 - 50.3USA (Wyoming) E. wyomingensis (15997)
Lysitean55.8 - 50.3USA (Colorado) E. stevensoniana (15654)
Wasatchian55.8 - 50.3USA (Wyoming) E. lativertebralis (46718) E. rivalis (177320) E. sp. (15458 15563 15566 15759 46650 46772 59904 59905)
Wasatchian55.8 - 50.3USA (New Mexico) E. lativertebralis (15443 176872 176873 176877 176879 176880 176882 176885 176886 176887 176888 176890 176891 176894 176898 176899 176900 176902 176909 176911 176912 176914) Emys cibollensis, Emys lativertebralis (131867)
Wasatchian55.8 - 50.3USA (Colorado) E. lativertebralis (176837)
Early/Lower Eocene55.8 - 48.6USA (Wyoming) E. sp. (15587)
Wasatchian - Bridgerian55.8 - 46.2USA (Wyoming) E. sp. (16134)
Wasatchian - Bridgerian55.8 - 46.2USA (New Mexico) E. sp. (25762)
Bridgerian50.3 - 46.2USA (Wyoming) E. arethusa, E. aegle, E. cyane (16228) E. cibollensis (70264) E. haydeni, E. wyomingensis (74504) E. naomi (16255 206092) E. ocyrrhoe (16201) E. septaria (16261 16262 16270 16273 16405 55207) E. septaria, E. wyomingensis (15837 16265 16267) E. sp. (16209 16296) Emys haydeni, Palaeotheca polycypha, Palaeotheca terrestris, Emys shaugnessiana (130809) Emys jeanesi, Emys haydeni, Emys stevensonianus (128447) Emys septarius (191004)
Bridgerian50.3 - 46.2USA (Utah) E. sp. (16396)
Bridgerian50.3 - 46.2USA (Colorado) E. stevensoniana (16242)
Middle Eocene48.6 - 37.2USA (Texas) E. sp. (37559)
Early/Lower Uintan46.2 - 40.4USA (Colorado) E. sp., E. septaria (16623)
Uintan46.2 - 40.4USA (Utah) E. callopyge (185685) E. callopyge, E. uintensis (185688 205622) E. depressa (185693) E. hollandi (185697) E. obscura, E. uintensis (185689) E. septaria (74505) E. uintensis, E. douglassi (185696)
Duchesnean40.4 - 37.2USA (Utah) E. sp. (16877)
Chadronian37.2 - 33.9USA (South Dakota) Chrysemys inornata (16900) Graptemys cordifera (16938 17013)