Montecristo scorpion evolutionary history predates island emergence

Genetic analysis has resolved the evolutionary mystery of the Montecristo scorpion, Euscorpius oglasae. The study, published in the Journal of Biogeography, reveals that this endemic species is most closely related to Euscorpius balearicus, a species found in the Balearic Islands.

The research indicates that the two lineages separated approximately 25.9 million years ago. This timeline is significant because Montecristo itself only emerged between 8.4 and 7.2 million years ago, meaning the scorpion's evolutionary history predates the existence of the island it currently inhabits.

Scientists attribute this phenomenon to major geological transformations in the Western Mediterranean. The fragmentation and movement of ancient microplates likely separated once-connected populations. The Montecristo lineage likely survived in the northern Tyrrhenian lands and reached the island following its emergence, eventually finding a final refuge there as surrounding populations faced extinction. The study was a collaborative effort involving the University of Lisbon, the American Museum of Natural History, and the University of Turin.