(CNN) -- A pea-sized seahorse, the world's longest insect, a "ghost slug" and the world's smallest snake were among the top 10 species discovered in 2008, a committee of scientists said Friday.These unusual critters were among thousands of species found last year, many in remote or tropical regions of the planet, that hint at the breadth of the Earth's undiscovered biodiversity.
"Most people do not realize just how incomplete our knowledge of Earth's species is," said Quentin Wheeler, director of the International Institute for Species Exploration at Arizona State University, which announced the top 10 new species list.
"We are surrounded by such an exuberance of species diversity that we too often take it for granted," Wheeler added.
The ASU institute and an international committee of taxonomists -- scientists devoted to species exploration and classification -- compile the top 10 list of new species each year.
Also on the 2008 list are a caffeine-free coffee plant, a snail whose shell twists around four axes, a palm that flowers itself to death and microscopic bacteria that live in hairspray.
Here's the complete list:
1. Pygmy seahorse: Classified by its Latin name, Hippocampus satomiae, this species measures about half an inch long and was found near Derawan Island off Kalimantan, Indonesia.
2. A plant that kills itself: Found in a small area of northwestern Madagascar, a rare genus of palm -- Tahina spectablilis -- produces huge, spectacular flowers and then dies and collapses. Fewer than 100 have been found.
3. Decaf, please: Known as Coffea charrieriana, this plant found in Cameroon is the first record of a caffeine-free coffee species from Central Africa.
4. Spray-on species: An extremophile bacteria, Microbacterium hatanonis, was discovered in hairspray by Japanese scientists.
5. A stick that moves: The world's longest insect, with a body length of 14 inches (22.3 inches including legs), Phobaeticus chani resembles a stick and was found in Borneo, Malaysia.
6. The Barbados Threadsnake: Leptotyphlops carlae measures only 4.1 inches long and is believed to be the world's smallest snake.
7. A pale "ghost slug": Selenochlamys ysbryda was a surprising find in the densely populated area of Cardiff, Wales.
8. A very limber snail: This unique species, Opisthostoma vermiculum, is found on a limestone hill in Malaysia and has a shell that twists around four axes.
9. Damsel in the deep blue sea: Chromis abyssus is a beautiful species of damselfish found in deep-reef habitat off the coast of Ngemelis Island, Palau.
10. Fossil mama: A fossilized fish, Materpiscis attenboroughi, is an extremely rare find from Western Australia and shows a mother giving birth 380 million years ago.
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