Historic Sighting of California Giant Salamander Larvae in Point Reyes

In September 2022, Michael Reichmuth, a fisheries biologist with the National Park Service, made a significant discovery while snorkeling in Olema Creek, located within Point Reyes National Seashore. For the first time in history, he photographed a group of freshly hatched California giant salamander larvae, scientifically known as Dicamptodon ensatus. This finding marks a notable milestone in the study of this elusive species, which is classified as a "Species of Special Concern" in California due to its limited range and sensitivity to environmental changes.

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The larvae were observed tightly clustered beneath rocks in a calm pool of water, measuring approximately 13 feet wide and 2.5 feet deep. Patrick Kleeman, a biologist with the United States Geological Survey, confirmed the identification of the species, noting that the larvae's back patterning would differ at this life stage. The presence of large, whitish yolk sacs indicated that the larvae were recently hatched, providing critical insights into their early development.

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The California giant salamander, which can grow up to a foot long, is the largest terrestrial salamander species in North America. Despite its size, it is notoriously difficult to spot in the wild. Prior to Reichmuth's discovery, there had been no documented observations of wild California giant salamander larvae, making this sighting particularly valuable for scientific research. The National Park Service emphasized that capturing images of these larvae allows researchers to gather more data about the species, including insights into their nesting habitats and the timing of their larval development.

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While the California giant salamander is not currently listed as endangered or threatened under the federal Endangered Species Act, its population may be declining, and scientists lack sufficient data to confirm this trend. Questions remain regarding the species' distribution, habitat needs, and movements. Reichmuth and his team have occasionally encountered juvenile salamanders during their fieldwork, but this recent sighting of larvae is unprecedented.

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The National Park Service encourages visitors to national parks to engage with their surroundings and report any sightings of California giant salamanders. Although snorkeling is not permitted in park creeks, visitors can contribute to ongoing research by uploading photos of their observations to a California giant salamander inventory.

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• “The fact that [Reichmuth] found them at all is interesting because there is so little information about this life stage in this species,” — Patrick Kleeman, Biologist, United States Geological Survey

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• “This one photo, along with Reichmuth’s account of where and when he took it, helps us understand giant salamander nesting habitat,” — National Park Service

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This historic sighting not only enriches the scientific understanding of the California giant salamander but also highlights the importance of conservation efforts for this sensitive species.

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