A small Greek island on the eastern edge of the Mediterranean has revealed a new species inside a man-made tunnel carved into a hillside.
During a survey of Kastellorizo in the Dodecanese, researchers found a previously unknown cave cricket inhabiting an artificial underground passage on Mount Vigla. The species, described in the Journal of Orthoptera Research, is part of the genus Dolichopoda. These cave-dwelling crickets occur throughout southern Europe and the eastern Mediterranean, and often form distinct species when populations become isolated in separate underground habitats.
These cave-dwelling crickets throughout southern Europe and the eastern Mediterranean and often form distinct species when populations become isolated in separate underground habitats.
The team named the species Dolichopoda balrogi after the Balrog, the ancient fire-demon who resided beneath the mountains in the Mines of Moria in J.R.R. Tolkien’s The Lord of the Rings. In Tolkien’s story, the Balrog remained hidden underground until disturbed by the Dwarves.
An Island With No Caves
Kastellorizo covers about nine square kilometers, making it one of the smallest inhabited islands in Greece. The island is actually located closer to the Turkish coast than to the Greek mainland. The landscape also lacks any accessible natural caves. The only underground environment available for survey was a single man-made tunnel, which explains why the cricket remained undiscovered until now.
Morphological analysis of both male and female specimens showed that D. balrogi has a unique combination of physical features. The structure of the male epiphallus, the shape of the tenth tergite, and the form of the female ovipositor set it apart from other Dolichopoda species.
Molecular analysis confirmed this. DNA barcoding showed that the Kastellorizo population belongs to an evolutionary lineage alongside southwestern Anatolian Dolichopoda species, especially D. sbordonii and D. lycia. However, this is the first time an Anatolian Dolichopoda lineage has been documented within European territory.
A Biogeography Bridge
Kastellorizo’s location already makes it a unique case in the eastern Mediterranean. Although it is officially part of Greece, the island sits just a few kilometers from the Turkish mainland, and its plants and animals reflect this proximity. The discovery of D. balrogi fits this pattern since its closest relatives are not found on other Greek islands but along the coast of Anatolia.
This finding also adds to the evidence that Kastellorizo acts as a biogeographic bridge, hosting species with roots and connections that set them apart from the rest of the Aegean islands.
“These findings remind us that biodiversity discoveries are not limited to remote tropical forests or deep oceans,” added lead researcher Konstantinos Kalaentzis. “Even familiar landscapes and human-made structures can harbour species that have remained unnoticed.”
A Fragile Find
Cave-adapted organisms such as Dolichopoda crickets are particularly vulnerable. Their entire known range may extend only to a single tunnel, cave, or hillside. D. balrogi appears to only exist in this single man-made passage. Construction, flooding, or other disturbances to that habitat could eliminate the species before researchers fully understand it.
The authors note that documenting hidden subterranean fauna is a necessary first step toward protection, and that artificial underground environments should receive more attention as possible refuges for specialized cave-dwelling species.
The Greek islands are among the least studied archipelagos in the Mediterranean in terms of biodiversity. The discovery of a new species with Anatolian evolutionary roots in a single tunnel on a nine-square-kilometer island suggests that the region’s unexplored caves and crevices may harbor many more undiscovered species.
Austin Burgess is a writer and researcher with a background in sales, marketing, and data analytics. He holds an MBA, a Bachelor of Science in Business Administration, and a data analytics certification. His work focuses on breaking scientific developments, with an emphasis on emerging biology, cognitive neuroscience, and archaeological discoveries.