More than 2 million animal and plant species have been catalogued, yet a 2011 PLOS Biology study estimates that Earth harbors roughly 8.7 million distinct taxa—four times the number we currently recognize. Each year, scientists add thousands of new species to the scientific record, steadily filling in the gaps of Earth’s biodiversity.
In 2024, researchers at Rice University in Houston announced the discovery of a new wasp species that had been literally flying “under our noses.” Over the past decade, biology professor Scott Egan’s team has identified 18 previously unknown species on campus, proving that significant discoveries can emerge from our own surroundings. Their latest find, Chrysonotomyia susbelli, is a mere millimeter long and represents the fourth wasp species uncovered at Rice in seven years.
Rice’s campus hosts more than 2,000 live oak trees, which support a diverse insect community. Senior student Brendan O'Loughlin noticed clusters of tiny yellow insects buzzing among the leaves of an oak. Unlike other small wasps the team had catalogued, these insects displayed a distinctive golden body marked with dark speckles.
O'Loughlin captured several specimens and examined them under a microscope. Suspecting a new species, he collaborated with Egan, graduate student Pedro Brandão‑Dias, and Smithsonian entomologist Mike Gates. DNA sequencing and field observations confirmed that the insects were indeed a previously unknown species, which the team described in the journal ZooKeys.
As the discoverer, O'Loughlin chose the name susbelli—the Latin translation of “war pig,” Wiess College’s mascot—paying homage to his residence college on campus.
Professor Egan’s expertise lies in gall wasps of the family Cynipidae, a group of about 1,300 species. Gall wasps lay their eggs inside plant tissue, usually on oaks and roses. The resulting larvae induce the plant to form a gall—a protective, nutrient‑rich structure that shelters the developing insect.
Unlike typical gall wasps, C. susbelli is a parasitic predator. It locates and consumes gall wasp larvae, then lays its own eggs within the same gall. This behavior—previously undocumented in the genus—renders C. susbelli a unique biological control agent within its ecosystem. Observations revealed that females display a distinctive zig‑zag movement along leaves as they hunt for suitable galls.
At present, the species has only been recorded on Rice University’s campus. Further research may uncover additional populations in other oak habitats, reminding us that even well‑studied locales can conceal undiscovered biodiversity.
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