Oldest known example of chameleonic insect found after 126 million years
By Catholic Online (NEWS CONSORTIUM)
3/20/2014 (3 years ago)
Catholic Online (www.catholic.org)
Many insects take on chameleonic aspects when they need to hide from predators. The "stick insect" can disguise itself by resembling a broken branch. Scientists have now uncovered the world's oldest known example of a stick insect in China, which waited 126 million years to be discovered.
One Malaysian variety of the stick insect is commonly known as Chan's megastick. It's the world's longest insect at about 22 inches long.
LOS ANGELES, CA (Catholic Online) - An international team of scientists declared this week that they have discovered the fossil of an insect whose appearance mimicked that of a nearby plant, the oldest-known stick or leaf insect that used such natural trickery.
There are roughly 3,200 known species of stick and leaf insects, which are members of the insect order known as Phasmatodea, derived from the ancient Greek word for "phantom."
Sometimes referred to as a walking stick or a walking leaf, the species is among the most striking creatures in the insect world. This variety develops unusual shapes to camouflage themselves as vegetation to avoid detection by predators.
Some of this species have flattened, leaf-like shapes, with appropriate color. Others possess cylindrical bodies shaped like sticks or like bark.
One Malaysian variety, commonly known as Chan's megastick, is the world's longest insect at about 22 inches long.
The recently discovered insect, named Cretophasmomima melanogramma, was found in Liaoning province in northeastern China. The fossil was part of the Jehol rock formation that has yielded many stunningly detailed fossils of creatures like early birds and feathered dinosaurs.
Researchers realized that the insect looked remarkably like the leaf of a plant that grew in the same place at the time that was a relative of the Ginkgo tree.
The fossil also showed wings with parallel dark lines that, when the bug was in the resting position. This seemed to produce a tongue-like shape that could hide its abdomen. The plant had similar tongue-shaped leaves marked with multiple lines.
Researchers think the insect evolved to look like these leaves, at one point turning green and concealed itself from predators by mingling with the foliage.
Females of this insect were estimated at about 2.2 inches long and the males a bit smaller.
"Cretophasmomima melanogramma is one of the grand-cousins of today's stick and leaf insects," paleontologist Olivier Béthoux of the Center for Research on Paleobiodiversity and Paleoenvironments says.
Cretophasmomima melanogramma lived during the Cretaceous, the last of the three time periods that make up the Mesozoic Era, sometimes called the Age of Dinosaurs. The warm, wet environment held a large array of plants, dominated by conifers but also featuring relatives of the Gingko, cycas and others.
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