A bacteria that lives in hairspray and a coffee bean without caffeine are among the top 10 new species revealed Friday by researchers at Arizona State University.

The plants, bugs and other creatures are among the 18,516 species discovered in 2007 and reported in the "Status of Observed Species."

The annual report is a collaboration of the International Institute for Species Exploration at ASU and four international organizations.

The caffeine-free coffee bean was discovered in Cameroon, a west African country researchers described as a "center of diversity" for that family of plants. The hairspray bacteria, known as an "extremophile," was discovered by a Japanese scientist.

Extremophiles live under harsh conditions in which most bacteria could not exist.

The top 10 list also includes a nocturnal white slug known as a "ghost slug" found in Wales, a 4-inch snake; the Barbados threadsnake, believed to be the world's smallest snake; and an Indonesian seahorse only half an inch high.

More than half of the new species were insects.

"Rapid environmental changes around the world highlight the urgent need to accelerate our exploration of Earth's species. Millions of species-the majority not yet known to science-face an uncertain future," the report said.