On the list are a pea-sized seahorse, caffeine-free coffee and bacteria that live in hairspray. The top 10 new species also include the very tiny (a snake just a slither longer than 4 inches or 104 millimeters), the very long (an insect from Malaysia with an overall length of 22.3 inches or 56.7 centimeters) the very old (a fossilized specimen of the oldest known live-bearing vertebrate) and the very twisted (a snail whose shell twists around four axes).

Rounding out this year's list are a palm that flowers itself to death, a ghost slug from Wales and a deep blue damselfish.

The taxonomists also are issuing an SOS - State of Observed Species - report card on human knowledge of Earth's species. In it, they report that 18,516 species new to science were discovered and described in 2007.

The SOS report was compiled by ASU's International Institute for Species Exploration in partnership with the International Commission on Zoological Nomenclature, International Plant Names Index, Zoological Record published by Thomson Reuters, and the International Journal of Systematic and Evolutionary Microbiology.

Among this year's top 10 picks is a tiny seahorse - Hippocampus satomiae - with a standard length of 0.54 inches (13.8 millimeters) and an approximate height of 0.45 inches (11.5 millimeters). This pygmy species was found near Derawan Island off Kalimantan, Indonesia. The name - satomiae - is "in honour of Miss Satomi Onishi, the dive guide who collected the type specimens."

From the plant kingdom is a gigantic new species and genus of palm - Tahina spectablilis - with fewer than 100 individuals found only in a small area of northwestern Madagascar. This plant flowers itself to death, producing a huge, spectacular terminal inflorescence with countless flowers.

After fruiting, the palm dies and collapses. Soon after the original publication of the species description, seeds were disseminated throughout the palm grower community, to raise money for its conservation by the local villagers. It has since become a highly prized ornamental.

Also on the top 10 list is caffeine-free coffee from Cameroon. Coffea charrieriana is the first record of a caffeine-free species from Central Africa. The plant is named for Professor Andre Charrier, "who managed coffee breeding research and collecting missions at IRD (Institut de Recherche pour le Developpement) during the last 30 years of the 20th century."

And, in the category of "spray on new species" is an extremophile bacteria that was discovered in hairspray by Japanese scientists. The species - Microbacterium hatanonis - was named in honor of Kazunori Hatano, "for his contribution to the understanding of the genus Microbacterium."

Phobaeticus chani made the list as the world's longest insect with a body length of 14 inches (36.6 centimeters) and overall length of 22.3 inches (56.7 centimeters). The insect, which resembles a stick, was found in Borneo, Malaysia.

The Barbados Threadsnake - Leptotyphlops carlae - measuring 4.1 inches (104 millimeters) is believed to be the world's smallest snake. It was discovered in St. Joseph Parish, Barbados.

The ghost slug - Selenochlamys ysbryda - was a surprising find in the well-collected and densely populated area of Cardiff, Glamorgan, Wales.

A snail - Opisthostoma vermiculum - found in Malaysia, represents a unique morphological evolution, with a shell that twists around four axes. It is endemic to a unique limestone hill habitat in Malaysia.

The other two species on the top 10 list are fish - one found in deep-reef habitat off the coast of Ngemelis Island, Palau, and the other a fossilized specimen of the oldest known live-bearing vertebrate.

Chromis abyssus - a beautiful species of damselfish made it to the top 10 representing the first taxonomic act of 2008 and the first act registered in the newly launched taxonomic database Zoobank.

As a result, in the first month following its original description, it was the most downloaded article in Zootaxa's history and was among the top 10 downloaded articles for 11 months in 2008. The discovery also highlights how little is known about deep-reef biodiversity.

Also on the top 10 list is a fossilized specimen - Materpiscis attenboroughi - the oldent known vertebrate to be viviparous (live bearing). The specimen, an extremely rare find from Western Australia, shows a mother fish giving birth approximately 380 million years ago. The holotype specimen has been nicknamed "Josie" by the discoverer, John Long, in honor of his mother.

"The international committee of taxon experts who made the selection of the top 10 from the thousands of species described in calendar year 2008 is helping draw attention to biodiversity, the field of taxonomy, and the importance of natural history museums and botanical gardens in a fun-filled way," says Quentin Wheeler, an entomologist and director of the International Institute for Species Exploration at Arizona State University.

"Charting the species of the world and their unique attributes are essential parts of understanding the history of life," says Wheeler.

"It is in our own self-interest as we face the challenges of living on a rapidly changing planet."

According to Wheeler, a new generation of tools are coming online that will vastly accelerate the rate at which we are able to discover and describe species.

"Most people do not realize just how incomplete our knowledge of Earth's species is or the steady rate at which taxonomists are exploring that diversity. We are surrounded by such an exuberance of species diversity that we too often take it for granted," says Wheeler, who also is ASU vice president, dean of the College of Liberal Arts and Sciences, and a professor in the School of Life Sciences.

The annual top 10 new species announcement and issuance of the SOS report commemorate the anniversary of the birth of Carolus Linnaeus, who initiated the modern system of plant and animal names and classifications. The 300th anniversary of his birth on May 23 was celebrated worldwide in 2007. Last year marked the 250th anniversary of the beginning of animal naming.

There are an estimated 1.8 million species that have been described since Linnaeus initiated the modern systems for naming plants and animals in the 18th century. Scientists estimate there are between 2 million and 100 million species on Earth, though most set the number closer to 10 million.

The SOS report card summarizes the number of major pspecies.asu.edulant and animal species newly described for the most recent year of complete data. The majority of the 18,516 species described (named) in 2007 were invertebrate animals (75.6 percent), vascular plants (11.1 percent) and vertebrates (6.7 percent). This year's SOS report also includes data for prokaryotes (bacteria and Archaea) in addition to protists.

The State of Observed Species report and list of top 10 new species issued annually by ASU's International Institute for Species Exploration is part of its public awareness campaign to shine attention on biodiversity and the field of taxonomy. Last year's list and report are online at species.asu.edu.

An international committee of experts, chaired by Janine N. Caira of the University of Connecticut, selected the top 10 new species for this year's list. Nominations were invited through the species.asu.edu Web site and also generated by institute staff and committee members.

The Caira committee had complete freedom in making its choices and developing its own criteria, from unique attributes or surprising facts about the species to peculiar names, Wheeler notes.

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