This semi-aquatic reptile of the Emydidae family is characterized by a moderately depressed oval carapace that can reach between 25 and 30 centimeters in straight length, with females being significantly larger and heavier than males. The carapace displays an olive-green to dark brown base coloration, adorned with intricate, radiating yellow, orange, or reddish bands that tend to fade with age, especially in old males which often exhibit intense melanism. Its head, neck, and limbs are dark with highly contrasting longitudinal yellow or orange stripes, with a distinctive post-orbital mark. The plastron is predominantly yellow with a symmetrical dark pattern of concentric figures.

Geographical distribution: The native range of this species is restricted to the temperate and subtropical regions of southeastern South America. It is widely distributed across southern Brazil (particularly in the state of Rio Grande do Sul), throughout Uruguay, and along the northeastern territory of Argentina, including the provinces of Entre Ríos, Corrientes, Santa Fe, Chaco, and the northern reaches of Buenos Aires, associated with the basins of the Paraná and Uruguay rivers.

Habitat: It primarily colonizes slow-moving or stagnant freshwater ecosystems. Typical environments include marshes, shallow lagoons, swamps, ponds, and slow-flowing rivers. It requires water bodies with abundant submerged and floating aquatic vegetation, soft muddy substrates, and numerous emerging structures such as fallen logs, branches, or grassy banks that receive direct sunlight, which are vital for its daily routines.

Feeding: It exhibits an opportunistic omnivorous diet that shifts dynamically throughout its life cycle. Juveniles are highly carnivorous, feeding on a wide variety of aquatic insects, snails, small crustaceans, tadpoles, and fish fry to satisfy their high protein requirements for rapid development. As they mature, their diet transitions toward herbivory, with adults feeding extensively on macrophytes, algae, and tender riparian vegetation, though they will still readily consume animal matter or carrion when available.

Behavior: It is a strictly diurnal and highly alert species that relies heavily on basking to regulate its body temperature. It spends long hours basking in the sun on logs, rocks, or grassy banks, often in dense, overlapping groups. This turtle possesses keen eyesight and sensitivity to vibrations; at the slightest sign of danger, it quickly retreats and dives into the water. During the colder winter months in its southern range, it undergoes brumation, settling into the soft mud at the bottom of wetlands to conserve energy.

Reproduction: The mating season occurs during the warm southern spring and summer months, from October to February. The courtship ritual is complex; the male swims backward in front of the female, vibrating his long front claws against her face and ocular region. After successful copulation, the female ventures onto land to locate a nesting site in sandy or loose soil with good drainage. She excavates a flask-shaped chamber using her hind limbs, where she deposits 10 to 25 flexible-shelled eggs. A single female can produce up to three clutches per season. Incubation takes approximately 60 to 90 days, with offspring sex determined by the nest temperature during a critical phase of embryonic development.

Conservation status: While globally recognized as a species of least concern due to its relatively broad distribution and stable populations in certain protected areas, it faces localized threats. Main conservation challenges include habitat loss and degradation due to agricultural expansion, drainage of wetlands, and water pollution. Additionally, it is heavily targeted by the illegal pet trade, where hatchlings are poached and sold globally, and suffers high mortality rates from vehicular collisions on roads bisecting its natural wetland habitats.