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Graptemys geographica (LESUEUR, 1817)

IUCN Red List - Graptemys geographica - Least Concern, LC
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Higher TaxaEmydidae, Deirochelyinae, Testudinoidea, Testudines (turtles)
Subspecies 
Common NamesE: Common Map Turtle, Northern Map Turtle 
SynonymTestudo geographica LESUEUR 1817: 86
Emys lesueuri GRAY 1831
Emys geographica — DUMÉRIL & BIBRON 1835: 258
Emys Geographica — DUMÉRIL & BIBRON 1854: 225
Graptemys geographica — AGASSIZ 1857
Malacoclemmys geographica — BOULENGER 1889
Malaclemys geographica — MCATEE 1907
Malacoclemmys geographicus – STUNKARD 1915
Graptemys geographica — ERNST & BARBOUR 1989: 218
Graptemys geographica — CONANT & COLLINS 1991: 57
Graptemys geographica — CROTHER 2000
Graptemys geographica — RHODIN et al. 2010
Graptemys geographica — TTWG 2021 
DistributionCanada (S Quebec, S Ontario),
USA (Louisiana, Mississippi, New Jersey, North Carolina, NW Vermont, New York, Pennsylvania (Susquehanna River drainage of Pennsylvania), Ohio, W West Virginia, W Virginia, Tennessee, NW Georgia, N Alabama, Kentucky, Indiana, Illinois, Michigan, E Minnesota, E Iowa, Missouri, E Kansas, NE Oklahoma, Arkansas, S Wisconsin, Maryland, Delaware River)

Type locality: restricted to the “peninsula of Presque Isle and adjacent Presque Isle Bay in Erie County, Pennsylvania” by Lindeman 2009.  
Reproductionoviparous. Exhibits temperature‐dependent sex determination (TSD) fide Cornejo-Páramo et al. 2020 (and references therein). 
TypesLectotype: Iconotype, drawn specimen by Le SUEUR 
DiagnosisAdditional details, e.g. a detailed description or comparisons (3941 characters), are available for collaborators and contributors. Please contact us for details. 
CommentDiet: omnivore; members of the genus Graptemys are highly adapted to molluscs (Ernst & Barbour 1989)

Type species: Testudo geographica LE SUEUR 1817: 86 is the type species of the genus Graptemys AGASSIZ 1857: 436.

Phylogeny: for a phylogeny of the genus see Thomson et al. 2018.

Habitat: freshwater (lakes, rivers)

Karyotype (Graptemys): Killebrew (1977a) reported the karyotype is 2n = 50: 26 macrochromosomes (16 metacentric, 6 submetacentric, and 4 telocentric or acrocentric), and 24 microchromosomes. McKown (1972), however, found several species to be 2n = 52.

McDowell (1964) revived Boulenger's inclusion (1889) of Graptemys in the genus Malaclemys. Graptemys was not recognized even as a subgenus, because the differences between M. terrapin and G. kohnii are no greater than those between G. kohnii and G. geographica. This arrangement was not widely accepted (see, for example, Ernst and Barbour, 1972, and Dobie and Jackson, 1979). Wood (1977) felt that McDowell had not made a convincing case for the all-inclusive Malaclemys and presented other evidence suggesting the origin of many, if not all, Graptemys from Malaclemys. However, Dobie (1981) showed Malaclemys to differ substantially from Graptemys in osteology,
which raises serious questions about Malaclemys as the immediate ancestor of Graptemys (Ernst & Barbour 1989).

Key to the species of Graptemys: Ernst & Barbour 1989: 217. 
EtymologyNamed after the carapacial pattern resembling contour lines on a map.

The genus name means “inscribed turtle”; probably referring to the carapacial pattern. 
References
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  • Anton, T. G. & Graser, W. H. 2012. Geographic distribution: Graptemys geographica (northern map turtle). Herpetological Review 43: 441-442 - get paper here
  • Anton, Thomas G., Cavataio, Joseph T. and Mills, Douglas 2016. New amphibian and reptile records from Illinois, USA. Herpetological Review 47 (4): 638 - get paper here
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  • BADJE, ANDREW F. & RICHARD A. STAFFEN. 2021. Geographic distribution: GRAPTEMYS GEOGRAPHICA (Northern Map Turtle). USA: WISCONSIN: Pepin Co. Herpetological Review 52 (1): 79. - get paper here
  • BANKS, KALEB M. & DRAKE A. PARKER. 2022. Geographic distribution: GRAPTEMYS GEOGRAPHICA (Northern Map Turtle). USA: MICHIGAN: Leelanau Co. Herpetological Review 53 (2): 261.
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