A team of scientists discovered in the Wet Tropics of Queensland (Australia) a new species of stick insect named Acrophylla alta, notable for its unusual size and weight.
The specimen can reach up to 40 centimeters in length and weigh 44 grams, making it one of the largest stick insects recorded in the country.
Distinctive Morphological Traits
- Coloration: light brown with green details.
- Legs: equipped with spines and unique lateral structures.
- Wings: not designed for prolonged flights, but as a defense mechanism or cushioning in falls.
- Eggs: with shapes and textures different from known ones, which confirmed it as a new species.
Evolutionary Adaptation
Specialists believe its large size is an adaptation to the mountainous and humid environment, where temperatures are lower.
According to researcher Angus Emmott (James Cook University), its larger body mass could help it conserve heat, in line with the “Bergmann’s rule”, which explains why certain animals tend to be larger in cold climates.
A Remote Habitat
The insect lives high in the trees, more than 1000 meters above sea level, which explains why it went unnoticed for so long. It only descends to the ground in exceptional situations, such as after storms or cyclones.
Scientific Importance
The finding not only sets a record for its size but also raises new questions about the evolution and adaptation of stick insects.
The specimens have already been added to the collection of the Queensland Museum for study.
Comparison with Other Giant Insects
The discovery of Acrophylla alta adds to the list of the world’s largest insects:
- Longest: stick insect Phryganistria chinensis Zhao (China), over 60 cm.
- Heaviest: giant weta (Deinacrida heteracantha, New Zealand), up to 70 g.
- Largest wingspan: white witch moth (Thysania agrippina), with over 30 cm of wings.
- Largest beetle: titan beetle (Titanus giganteus, Amazon), up to 18 cm.
- Largest butterfly: Queen Alexandra’s birdwing butterfly (Ornithoptera alexandrae), with females exceeding 28 cm in wingspan.
Other notable giants include the Goliath beetle, the tarantula hawk wasp, and the belostomatids (giant water bugs).
The discovery of Acrophylla alta demonstrates that there are still unknown species in remote and little-explored ecosystems. This giant stick insect not only breaks size records but also offers clues to understanding the resilience and evolution of life in extreme conditions.
