Head to head
Escambia Map Turtle vs Texas Map Turtle
An Escambia map turtle and a Texas map turtle are both single-river endemics within the map turtle genus, yet each tells a slightly different story about how a species this narrowly confined comes to be recognised and understood by science.
| Escambia Map Turtle | Texas Map Turtle | |
|---|---|---|
| Scientific name | Graptemys ernsti | Graptemys versa |
| Taxonomic history | Split into its own species in 1992 | Long recognised as distinct |
| Range | Escambia River drainage, FL Panhandle/AL | Colorado River system, central Texas |
| Female vs male jaw | Noticeably wider in females | Noticeably wider in females |
| Diet | Mussels, snails, insect larvae | Snails, mussels, insect larvae |
| Basking behaviour | Groups on logs and sandbars | Groups on logs and sandbars |
| Shell keel | Pronounced | Pronounced |
| Conservation status | Least Concern | Least Concern |
Escambia Map Turtle vs Texas Map Turtle: common questions
Which of these two map turtles was more recently recognized as its own species?
The Escambia map turtle was only formally described as its own distinct species in 1992, having previously been grouped together with a similar-looking relative, while the Texas map turtle has long been recognised as a separate species without a comparable history of reclassification.
Do the Escambia map turtle and Texas map turtle live in the same river system?
No, the Escambia map turtle is confined to the Escambia River drainage of the Florida Panhandle and southern Alabama, while the Texas map turtle is found only within the Colorado River system of central Texas, meaning the two single-river endemics have no range overlap at all.
Do both species show the same male-female jaw difference?
Yes, both the Escambia map turtle and the Texas map turtle show females developing a considerably wider, more robust jaw than males, an adaptation that lets females crush harder-shelled prey such as mussels and snails that males cannot manage as effectively.