Argentine Black and White Tegu (Salvator merianae)

Scientific Name: Salvator merianae
Common Name: Argentine Black and White Tegu

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Species Overview

Size: Adults typically reach 3.5 to 4.5 feet (42 to 54 inches) in total length, with males becoming significantly bulkier and broader-headed than females.

Appearance: The Argentine Black and White Tegu is a large, muscular lizard known for its striking black-and-white banding, beaded scales, and strong limbs. Juveniles often show bright green coloration on the head that fades with age. Adults develop a high-contrast pattern of black bands, white speckling, and reticulated striping across the back and tail. Their powerful jaws, thick neck, and heavy body give them a robust presence. During the breeding season, males may develop pronounced jowls.

Distribution: Native to eastern and central South America, particularly Argentina, Paraguay, Brazil, and Uruguay.

Habitat: In the wild, this species inhabits grasslands, savannas, marsh edges, forest clearings, and areas with abundant burrow opportunities. They are semi-aquatic and highly adaptable, capable of thriving in varied environments. In captivity, they require large terrestrial setups with deep substrate for digging.

Behaviour: Argentine Black and White Tegus are diurnal, highly intelligent, and food-motivated. With proper care and consistency, they can become very responsive and tolerant of handling. They brumate naturally during cooler months but may or may not do so in captivity depending on temperature and photoperiod.

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Captive Care

Enclosure: A large terrestrial enclosure is essential. A minimum of 6 feet × 3 feet × 2.5 feet (72 × 36 × 30 inches) is recommended for an adult, though larger is preferred. Provide 10–12 inches of deep substrate for burrowing, sturdy hides, logs, and platforms. Enclosures must be secure, as tegus are powerful diggers and escape artists.

Temperature & Humidity:

• Basking area: 115 to 130°F (46 to 54°C)

• Ambient warm side: 85 to 95°F (29 to 35°C)

• Cool side: 75 to 82°F (24 to 28°C)
  Humidity should remain moderate, between 60 and 80%, depending on age and shedding cycle. Mist as needed but avoid overly damp substrate.

Lighting: Provide strong full-spectrum lighting with high-output UVB (10–14%) for 12 hours daily. This species thrives under bright, intense light that mimics natural sunlight.

Diet: Argentine Tegus are omnivores. Offer a rotation of insects, lean meats, fish, quail eggs, rodents (sparingly), fruits, and vegetables. Juveniles require daily feeding; adults eat 3 to 4 times per week. Supplement all food with calcium and multivitamins as needed.

Behaviour in Captivity: With consistent care, many Argentine Tegus become calm, intelligent, and interactive. They are strong diggers and climbers, and appreciate enrichment such as varied terrain, digging areas, scent trails, and hides. They require significant space and regular cleaning due to their size and metabolism.

Special Considerations: Tegus grow large and require substantial heating, lighting, and space. They are strong and can cause injury if startled, so handling should be confident and controlled. Proper humidity and hydration are essential to prevent shedding issues. Secure enclosures are mandatory.

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Taxonomy Note

The Argentine Black and White Tegu belongs to the genus Salvator, containing the large-bodied South American tegu species. S. merianae is one of the most recognizable and widely kept tegus, known for its intelligence and adaptability.

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Genetics Note

There are no natural morphs formally recognized for wild-type Argentine Black and White Tegus. Captive populations display minor variation in contrast, banding density, and green head retention in juveniles, but these are typical locality-based differences rather than genetically defined morphs. Albino, High White, Hypo, and other morphs exist in captivity but represent separate selectively bred lines distinct from the standard Argentine Black and White Tegu.