Graptemys versa (Texas Map Turtle)
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Graptemys versa, commonly known as the Texas Map Turtle, is a small to medium-sized freshwater turtle native to central Texas. Renowned for its intricately patterned shell resembling a geographical map, this species captivates both researchers and turtle enthusiasts with its unique appearance and behaviors.
Native To These Regions
Texas (USA)Native Turtle Species Map – Find Turtles by Region
Scientific Classification
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Testudines
Family: Emydidae
Genus: Graptemys
Species: G. versa
Common Names
- Texas Map Turtle
- Texas Sawback
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Identification
Description
The Texas Map Turtle features an olive to dark brown carapace adorned with yellowish lines forming map-like patterns. The shell is keeled with prominent spines or knobs along the vertebral ridge, more pronounced in juveniles and males. Its plastron is lighter, usually yellow with dark markings along the seams. The skin is dark gray to olive with yellow stripes extending along the neck, limbs, and head, and a distinctive small yellow spot behind each eye.
Sexual Dimorphism
Sexual dimorphism is evident in this species. Females are significantly larger, reaching up to 7 inches (18 cm) in carapace length, while males typically grow up to 4 inches (10 cm). Males have longer, thicker tails and elongated foreclaws used during courtship rituals. Females possess broader heads and stronger jaws adapted for crushing mollusk shells.
Check more turtles from the Graptemys genus
Native Origin and Distribution
Geographical Range
Endemic to central Texas, the Texas Map Turtle is primarily found within the Colorado River drainage system. Its range includes the lower Colorado River and its tributaries, confined exclusively to this region.
Preferred Habitat
This species thrives in clear, slow to moderately flowing rivers and streams with abundant aquatic vegetation and ample basking sites like logs and rocks. They prefer habitats with sandy or muddy bottoms and areas that provide both deep pools and shallow riffles.
Behavior
Feeding Habits
Texas Map Turtles are omnivorous. Females, equipped with stronger jaws, predominantly feed on mollusks like snails and clams, as well as crustaceans. Males and juveniles consume more insects, larvae, and aquatic vegetation. This dietary difference reduces food competition between the sexes.
Predators
Predators include larger fish, birds of prey, raccoons, and occasionally humans. Eggs and hatchlings are especially vulnerable to predation from birds, mammals, and other reptiles.
Reproduction
Breeding Season
Breeding occurs in the spring and early summer months. Nesting typically takes place from May through July.
Reproductive Method
Females lay 5 to 10 eggs per clutch in sandy or soft soil near water sources. They may produce multiple clutches in a season. Incubation lasts approximately 60 to 75 days, with hatchlings emerging in late summer or early fall.
Conservation
Extinction Status
Currently, the Texas Map Turtle is listed as Least Concern on the IUCN Red List. However, due to its limited range, it is susceptible to localized threats.
Threats
- Habitat Destruction: Pollution, dam construction, and water extraction alter their natural habitats.
- Illegal Collection: Capture for the pet trade reduces wild populations.
- Human Disturbance: Recreational activities can disrupt basking and nesting behaviors.
Conservation Measures
- Legal Protection: Regulations limit or prohibit the collection of wild specimens.
- Habitat Conservation: Efforts are made to preserve and restore natural waterways.
- Public Awareness: Education programs promote the importance of the species and its habitat.
Economic Importance
While not a major economic driver, the Texas Map Turtle is part of the pet trade industry. Responsible breeding in captivity contributes to local economies and reduces pressure on wild populations.
Interesting Facts
- The intricate shell patterns not only serve as camouflage but also have inspired scientific interest in their development.
- Texas Map Turtles are known for their skittish nature, quickly diving into the water when approached.
- They play a crucial ecological role in controlling insect and mollusk populations, contributing to the health of their freshwater ecosystems.
About Author
Muntaseer Rahman started keeping pet turtles back in 2013. He also owns the largest Turtle & Tortoise Facebook community in Bangladesh. These days he is mostly active on Facebook.
