Walking shark found in Papua New Guinea is new to science

The discovery of *Hemiscyllium dudgeonae*, the tenth known species of walking shark, in the reefs of Papua New Guinea is more than a biological oddity—it underscores the urgency of cataloging marine biodiversity before it vanishes. These small, bottom-dwelling sharks, which propel themselves across shallow reef flats using their pectoral fins, are living relics of an evolutionary experiment that has persisted for millions of years. Their existence challenges the conventional image of sharks as fast, open-ocean predators, revealing instead a lineage that has adapted to a niche lifestyle in coral ecosystems. Yet this discovery also highlights a paradox: as science identifies new species, many remain confined to minuscule ranges, rendering them vulnerable to the slightest environmental disruption. The broader significance lies in the timing. Marine biodiversity is declining at an alarming rate, with coral reefs—these sharks’ primary habitat—losing half their global coverage since the 1950s. The restricted distribution of walking sharks, particularly in regions like Papua New Guinea where coastal development and climate change threaten reef systems, suggests that extinction risks may be higher than currently assessed. Unlike their more mobile relatives, walking sharks cannot easily relocate as conditions degrade, making them bellwethers for the health of reef ecosystems. Their survival may depend on localized conservation efforts, yet funding and policy protections often lag behind terrestrial species. What remains unclear is how *Hemiscyllium dudgeonae* fits into the broader evolutionary puzzle of walking sharks. Only ten species have been recorded, all confined to the Indo-Australian archipelago, yet genetic studies hint at undiscovered diversity within this group. Researchers must now determine whether this new species occupies a stable population or if its limited range has already placed it on a precarious trajectory. Meanwhile, the discovery raises questions about how many other marine species—especially those in remote or poorly studied regions—remain unknown to science, and whether they will be documented before their habitats disappear. As climate change intensifies and reef degradation accelerates, each new species identified is a reminder of what we stand to lose—and a call to action to protect the unseen corners of our planet’s ecosystems.