High in the mountain forests of western Thailand, scientists have found a new lizard. This tiny creature has a striking look and unique biology. It earned a name fit for a fantasy dragon.
This newly discovered mountain horned dragon, Acanthosaura syrax, is named after Syrax. Syrax is the yellow dragon ridden by Queen Rhaenyra Targaryen in the show House of the Dragon. The real lizard shares traits with its fictional namesake. These include a yellowish-green color, small size, and many eggs.
A Tiny Dragon with a Fantasy Name
The lizard's ability to lay many eggs was especially unique. Four out of five females studied were carrying eggs. Each clutch had six to 16 eggs. Researchers suggested "Syrax mountain horned dragon" as its common English name. A Thai name with the same meaning was also proposed.
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Start Your News DetoxMountain horned dragons are part of the agamid lizard family. This family also includes bearded dragons. Acanthosaura lizards live in parts of Southeast Asia. They are known for pointed scales and crests on their head, neck, and back. The discovery of A. syrax brings the total number of species in this group to 23.
This new species is unusually small. The largest male found was only about 69.6 millimeters (2.7 inches) from snout to vent. The largest female was 101.2 millimeters (4.0 inches). Females were noticeably bigger than males.
Its "horns" are also small. A. syrax has the smallest neck and back crest scales ever recorded in its group. Researchers also noted a distinct dark collar on its neck. The species lacks the black patch around the eye seen in some relatives.
These differences were not just based on looks. The team recorded many body features from eight lizards. They compared these to other mountain horned dragons. They also looked at two genes, ND2 and COI. Both types of evidence showed these animals belong to their own evolutionary line. They are distinct from the closely related A. lepidogaster and other species in the study.
What Makes Acanthosaura syrax Special
So far, the Syrax mountain horned dragon is only known from Mae Wong National Park in western Thailand. This is in the Tak-Kamphaeng Phet region. Researchers mainly found it in evergreen forests above 1,300 meters (4,265 feet). They did not find it below 1,000 meters (3,281 feet).
This small elevation range might explain why the species was not found earlier. Mountain environments can separate animal groups into isolated areas. These are like ecological islands, cut off by warmer or unsuitable habitats.
Observations in the field show how these small dragons spend their days. They were seen basking on rocks, fallen logs, shrubs, and even concrete in the morning and midday. Some looked for earthworms near dawn. Later, they hid under logs and rocks or in tree holes. Researchers saw them most often from late dry season to early monsoon, from April to mid-June.
About 50 kilometers (31 miles) north, the team found A. lepidogaster. This related species lives in lower, warmer areas. This supports the idea that A. syrax needs the cooler mountain conditions.
Life in Thailand’s High Mountain Forests
The species' limited known habitat is a concern. If A. syrax truly relies on a small band of cool, high-elevation forest, habitat loss could isolate its populations even more.
Researchers believe protecting Mae Wong's mountain forests would help more than just this new lizard. The area is also home to rare wildlife. This includes the Asian forest tortoise, Oldham’s leaf turtle, and the Indochinese tiger.
They suggest A. syrax could become a flagship species for these forests. Its unique look and memorable name could draw attention to a habitat that supports many other animals.
Why the Syrax Mountain Horned Dragon Matters
Thailand's isolated mountain forests may still hold undiscovered species. This is especially true for animals with small ranges and specific habitat needs. Researchers say surveys of nearby mountain systems could show how far A. syrax actually lives. They could also reveal if more hidden reptile diversity exists.
Deep Dive & References
Acanthosaura syrax sp. nov., a new species of mountain horned dragon from high-elevation habitats of western Thailand (Squamata, Agamidae) - ZooKeys, 2026
