A ‘Giant’ Cave Creature With Teeth and 11 Claws Discovered in Australia
Researchers identified a new crustacean species armed with up to 11 claws and protruding teeth deep inside an Australian cave — but at nearly 6 millimeters long, it’s roughly the width of a pencil eraser.
KEY FACTS:
- Researchers have identified a new species of crustacean inside Totem Pole Cave in Australia’s Northern Territory, formally named Megabathynella totemensis.
- The species was described in a study published in May 2024 in the European Journal of Taxonomy.
- At nearly 6 millimeters, the creature is considered a “giant” among its crustacean group — the study defines species larger than 4 mm as “giant” and those 2.5-4 mm as “large.”
- The species has a segmented body with “protruding” teeth, “well-developed” claws — up to 11 of them — and “enlarged” spines along the inside wall of the thorax.
- At least 80 translucent organisms were observed swimming in shallow pools inside the cave.
A ‘Giant’ Among Tiny Relatives
The species belongs to a group of crustaceans known as Bathynellacea, where size is measured on a very different scale than most people would expect.
“Here, we consider species larger than 4 mm to be ‘giant’ and those of 2.5-4 mm to be ‘large,’” according to the study.
At nearly 6 millimeters, Megabathynella totemensis is a genuine heavyweight among its peers. Most of its relatives are considerably smaller.
Armed With Claws, Teeth, and Spines
Despite its tiny size, this crustacean comes fully equipped. The study describes a segmented body with “protruding” teeth and “well-developed” claws — and more of them than nearly any known relative.
“The new genus has numerous claws, … up to 11, and only some species of Billibathynella come close, with 10 claws, but the most common state is seven claws,” the study states.
Researchers also reported “enlarged” spines along the inside wall of the thorax. The creature is translucent, and at least 80 of the organisms were observed swimming in shallow pools inside the cave — dozens of ghostly, see-through bodies gliding through dark underground water.
Found in Totem Pole Cave
The discovery took place in Totem Pole Cave, located in the Pungalina karst area along the Gulf of Carpentaria on the northern coast of Australia. Karst landscapes are known for their underground drainage systems, caves, and sinkholes — environments where unusual species can thrive in isolation.
Researchers spotted the translucent crustaceans in shallow pools, eventually collecting and studying specimens that led to the formal identification of a species entirely new to science.
The creature’s scientific name reflects both its size and its home. Researchers said the species’ “unusually large” size contributed to its name. The genus name Megabathynella derives from the Greek word μέγας, meaning big. The species name totemensis refers directly to Totem Pole Cave.
What It Suggests About Undiscovered Life
The discovery hints at how much remains unknown in underground habitats worldwide.
“As new species continue to be discovered and described in Australia and around the world, it is interesting to observe that large and giant species (of Bathynellacea) occur on every continent,” researchers said. “It is likely that numerous new species will be discovered in these and other countries with further survey of prospective habitats, as is the case in Australia. Future studies could explore the factors that lead to this unusually large size and proliferation of articles and setae observed.”
Every continent has its own version of these creatures, and many almost certainly haven’t been identified yet. The caves, underground rivers, and shallow subterranean pools are full of life that science is only beginning to catalog.
Perspective Is Everything
The word “giant” primes us for something massive. Instead, the reality is a translucent crustacean smaller than a pea that has been quietly living in an Australian cave, completely unknown to science until now.
In the world of Bathynellacea crustaceans, Megabathynella totemensis is a remarkable outlier — bigger, clawier, and toothier than most of its relatives. In the world of everyday human experience, it would be invisible.
Somewhere in the Northern Territory of Australia, in the dark, still pools of Totem Pole Cave, at least 80 tiny translucent giants are swimming around right now — with their 11 claws, their protruding teeth, and their enlarged spines — completely unbothered by the fact that the rest of the world just learned they exist.
BOTTOM LINE: Researchers say “numerous new species” of these crustaceans likely remain undiscovered in caves and underground habitats on every continent, suggesting this find is just one small piece of a much larger picture of hidden subterranean life.
Production of this article included the use of AI. It was reviewed and edited by a team of content specialists.
