Mertens' Worm Lizard

Mertens' Worm Lizard

Amphisbaena mertensii

Silhouette: Roberto Díaz Sibaja · PhyloPic

Least ConcernNear ThreatenedVulnerableEndangeredCritically Endangered
Daily sighting probability Insufficient data
at Iguazú National Park
2 Verified sightings at Iguazú National Park From 2019 to 2026
2 Verified sightings across 1 park From 2019 to 2026
☀️ Diurnal When it's spotted during daytime hours (6am–6pm)

About the Mertens' Worm Lizard

Amphisbaena mertensii, also known as the Mertens' worm lizard or Mertens's worm lizard, is a species of worm lizard in the family Amphisbaenidae. The species is endemic to South America. Amphisbaenians are fossorial reptiles with few predators due to their powerful bite and writhing defensive tactics. However, some snakes have been found feeding on amphisbaenians including A. mertensii. This species is also able to defend itself against dangerous predators such as snakes by releasing a foul discharge from its cloacal region.

The specific name, mertensii, is in honor of a Dr. Mertens who collected the holotype. A. mertensii is found in northern Argentina, southeastern Brazil, and eastern Paraguay. A. mertensii is oviparous. List of reptiles of Brazil

Boulenger GA (1885). Catalogue of the Lizards in the British Museum (Natural History). Second Edition. Volume II.... Amphisbænidæ. London: Trustees of the British Museum (Natural History). (Taylor and Francis, printers). xiii + 497 pp. + Plates I-XXIV. (Amphisbæna mertensii, p. 441).

Gans C (2005). "Checklist... Wikipedia →

Global Distribution

Warmer areas are where this animal is recorded most often.

Parks Where Found

# Park Country Daily sighting probability
1 Iguazú National Park 🇦🇷 Argentina
Insufficient data

More parks will be added in future updates.

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