World's Smallest Snake Discovered, Study Says

A snake that's as thin as a spaghetti noodle with a body small enough to rest comfortably on a U.S. quarter has just been identified as the world's smallest snake, according to a paper published today in the journal Zootaxa .

The newly identified species, Leptotyphlops carlae, measures just 3.9 inches long and was found under a rock on the western Atlantic island of Barbados. Two other extremely small snakes, L. bilineatus from Martinique and L. breuili from Saint Lucia, were identified nearby, suggesting that the world's three smallest snakes are all Caribbean threadsnakes.
Blair Hedges, who made the finds, told Discovery News that "determining the smallest (snake) is not simple."
Hedges, an evolutionary biologist at Penn State University, previously identified the world's smallest frog and lizard on Caribbean islands. He explained that the process of naming the smallest requires measuring adult individuals -- ideally at least one male and one female -- and then comparing the average size to all other known species.
He determined the Barbados threadsnake is the smallest of more than 3,100 known snakes. The snake may even be as miniscule as nature could go for snakes since, if it were any smaller, he believes its young would have nothing to eat. As it stands, Hedges thinks it primarily consumes the tiny larvae of termites and ants.
Females of this smallest species produce just one slender egg. In contrast to larger species that may lay up to 100 eggs in a single clutch, with each egg measuring just a fraction of the mother's body, this snake produces a single hatchling that is half its mother's size.
"The fact that tiny snakes produce only one massive egg -- relative to the size of the mother -- suggests that natural selection is trying to keep the size of hatchlings above a critical limit in order to survive," he explained.
Hedges added that, because of the snake's small size, "almost anything could be a predator, including centipedes and spiders."
Already the species appears to be in grave danger.

Why Ireland Has No Snakes

Legend has it that St. Patrick drove all the snakes from Ireland. Sometime back in the fifth century he stood on a hill, the story goes, and used a staff to herd the slithering creatures into the sea, banishing them for eternity. It's true, aside from zoos and pets, there are no snakes on the emerald isle. In fact, there never were any snakes in Ireland. This state of affairs probably has more to do with the vagaries of geography than any neat tricks performed by St. Patty.

Snakes first evolved from their lizard forebears about 100 million years ago during the late Cretaceous period, about the same time that Tyrannosaurus rex first appeared. Early snakes were small and wormy, resembling modern blindsnakes (suborder Scolecophidia). Ancient snake fossils are found only on southern continents, suggesting that snakes first radiated from Gondwanaland—a former supercontinent comprised of modern-day Antarctica, South America, Africa, India, and Australia. Migrating to Ireland wasn't an option at this time, as the area was completely underwater. The chalky sediments that would eventually become the 700-foot Cliffs of Moher on Ireland's west coast were being laid down at the bottom of the sea.
During the Cenozoic era, beginning 65 million years ago, the world's climate gradually began to dry out, and vast tracts of grasslands and other open habitats came to dominate much of the northern hemisphere. Large dinosaurs went extinct, opening the door to new groups of animals. By the Eocene epoch, 50 to 35 million years ago, the predecessors of boas and pythons (called the basal Macrostomatans) were widespread throughout the northern hemisphere. Explosive radiation of snakes in the suborder Colubroidae, including vipers and cobras, occurred during the Miocene epoch, 25 million years ago. Now snakes are found in deserts, grasslands, forests, mountains, and even oceans virtually everywhere around the world. Everywhere except Ireland, New Zealand, Iceland, Greenland, and Antarctica, that is.
One thing these few snake-less parts of the world have in common is that they are surrounded by water. New Zealand, for instance, split off from Australia and Asia before snakes ever evolved. So far, no serpent has successfully migrated across the open ocean to a new terrestrial home. As the world's oceans have risen and fallen over the millennia, land bridges have come and gone between Ireland, other parts of Great Britain, and the European mainland, allowing animals and early humans to cross. However, any snake that may have slithered it's way to Ireland would have turned into a popsicle when the ice ages hit.
The most recent ice age began about three million years ago and continues into the present. Between warm periods like the current climate, glaciers have advanced and retreated more than 20 times, often completely blanketing Ireland with ice. Snakes, being cold-blooded animals, simply aren't able to survive in areas where the ground is frozen year round. Ireland thawed out for the last time only 15,000 years ago. Since then, 12 miles of icy-cold water in the Northern Channel have separated Ireland from neighboring Scotland, which does harbor a few species of snakes. There are no snakes in Ireland for the simple reason that they can't get there.
Snakes and MythsSo where did the myth of St. Patrick and the snakes come from? Most scholars agree that snakes symbolize paganism, which St. Patrick is also credited for banishing from Ireland. Snakes as symbols of evil are prevalent throughout Judeo-Christian mythology, most notoriously in the Garden of Eden as a tempter of Eve. Other societies have viewed snakes with more favor. Snakes were venerated in ancient Egypt, and many gods were represented by snakes, such as the cobra goddess Neith, founder of the universe. More recently, Ben Franklin advocated making a rattlesnake the symbol of the United States.
Mythology aside, herpetologists (scientists who study snakes and other reptiles and amphibians) like to point out that snakes play an important role in many ecosystems throughout the world. Snakes benefit humans by controlling rodent populations, and snake venom has been used to treat various diseases, including cancer, heart disease, and hemophilia. Unfortunately, some 200 species of snakes are considered threatened or endangered, the biggest threat being habitat loss resulting from human activities. Unless humans start taking more of an interest in their survival, real-life snakes may find themselves banished from more places than just Ireland.