In the dusty collections of Cornell University, a chunky-bodied moth with pink-hued wings sat waiting to tell its story—a specimen so visually distinct from its relatives that it took a decade of detective work, a chance encounter at the Smithsonian, and a DNA sample from 1960 to finally confirm what one researcher suspected all along: Florida had a moth species all its own.
That moth is Cicinnus albarenicolus, the Florida sack-bearer, formally named and described for the first time this spring by Ryan St Laurent, an evolutionary biologist and entomologist at the University of Colorado Boulder Museum of Natural History, alongside collaborators Scott Wehrly and Jeff Slotten. The discovery, published in ZooKeys in March 2026, highlights both the hidden richness of Florida's scrub ecosystem and the fragility of species that depend on it.
The Florida scrub itself is a landscape that doesn't announce itself—scattered patches of low shrubs and short oaks sprouting from sand, both along the coast and inland. Yet this unassuming habitat harbors some of the continent's rarest animals, including the threatened Florida scrub-jay, the only bird species found nowhere else on Earth. Now it is also home to a moth that belongs to Mimallonidae, a small family of just over 300 species worldwide. Only six sack-bearers are known from North America, making Cicinnus albarenicolus an exceptionally rare addition to the region's wildlife inventory.
The name itself tells a story. "Sack-bearer" refers to the caterpillars' peculiar survival strategy: they construct sacklike cases and carry them around like hermit crabs with shells. The formal name, Latin for "white sand dweller," captures the moth's preference for the pale soil beneath Florida's scrub vegetation. Adult males span about 1.25 to 1.5 inches—medium-sized for a moth—and display distinctive pink-hued wings that first caught St Laurent's eye when he was an undergraduate examining museum specimens.
What makes the discovery bittersweet is the context in which it unfolds. The Florida scrub has shrunk to roughly 10 percent of its pre-settlement extent, a degradation so severe that when St Laurent began searching for living specimens as a graduate student at the University of Florida, he feared the moth might already be extinct. No one had documented it in the wild for decades. Then, at the Smithsonian National Museum of Natural History, where St Laurent was working as a postdoctoral fellow, he uncovered a single specimen from 1960—old enough that it seemed destined for the archive, yet recent enough to yield viable DNA. The genetic analysis proved what St Laurent had long suspected: this was unambiguously a distinct species, separate from the beige-colored Melsheimer's sack-bearer that ranges across the eastern United States.
The turning point came in late 2025, when fellow moth collectors in Florida reported having specimens from the 2010s and 2020s—proof that Cicinnus albarenicolus persists. This discovery allowed St Laurent and his team to update their formal description with contemporary data and report the moth still alive in its native habitat. In April, St Laurent traveled to Florida during the moth's known active period of March to May, hoping not only to observe it firsthand but to locate a female—something no researcher had documented in more than six decades.
The rediscovery of a species hidden within scientific collections speaks to how much biodiversity remains incompletely catalogued. It also underscores an urgent question: now that we know Cicinnus albarenicolus exists, can we protect the scrubland it depends on before that story ends like so many others in Florida's environmental history.