The Escambia map turtle (Graptemys ernsti), also known commonly as Ernst's map turtle, is a species of turtle in the family Emydidae. The species is endemic to the United States.

Geographic range

Graptemys ernsti is found in southern Alabama and western Florida, in rivers which drain into Escambia Bay.

Habitat

The preferred natural habitat of Graptemys ernsti is flowing fresh water, in medium to large creeks and rivers.

Etymology

The specific name, ernsti, is in honor of American herpetologist Carl Henry Ernst.

Description

Females of Graptemys ernsti are larger than males. Females may attain a straight carapace length of 28.5 cm (11.2 in), but males only grow to a straight carapace length of 13 cm (5.1 in).

Diet

The diet of Graptemys ernsti varies according to age and gender. Males and juveniles prey predominately upon insects, but females prey almost entirely upon snails and clams, including the invasive species Corbicula fluminea.

Reproduction

Males of Graptemys ernsti reach sexual maturity at an age of 3–4 years, but females don't reach sexual maturity until an age of 14–19 years. Each sexually mature female lays an average of 4 clutches a year, with an average clutch size of 7 eggs.

Further reading

  • Ennen JR; Godwin J; Lovich JE; Kreiser BR; Folt B; Hazzard S (2016). "Interdrainage Morphological and Genetic Differentiation in the Escambia Map Turtle, Graptemys ernsti". Herpetological Conservation & Biology. 11 (1): 122–131.
  • Lovich JE; McCoy CJ (1992). "Review of the Graptemys pulchra Group (Reptilia: Testudines: Emydidae), with Descriptions of Two New Species". Annals of Carnegie Museum. 61 (4): 293–315. ("Grapemys ernsti, new species", pp. 300–302, Figures 4–5).