Animals that seem identical may be completely different species

April 23rd, 2009 - 4:20 pm ICT by ANI  

Washington, April 23 (ANI): In a new research, scientists used DNA analyses to discover that one of the most common segmented worms is actually two types of worm, leading to the hypothesis that animals that seem identical may belong to completely different species.

The research, by scientists at the University of Gothenburg, Sweden, suggests that the variety of species on the earth could be considerably larger than we thought.

“We could be talking about a large number of species that have existed undiscovered because they resemble other known species,” said Professor Christer Erseus.

The segmented worms that were studied by Christer Erseus, doctoral student Daniel Gustavsson and their American colleague, are identical in appearance.

From the very first time that they were described, they have been treated as the same species, and they are also found together in freshwater environments in North America, Sweden and the rest of Europe.

But when the researchers examined the worms using advanced methods for DNA analysis, they discovered that they were in fact two different species.

Both species of worm differ in one of the examined genes by 17 percent, which is twice as much as the equivalent difference between humans and chimpanzees.

The research results could have major consequences.

For example, the worms are frequently used for laboratory testing around the world, to examine the effects of environmental toxins.

“Different species have different characteristics. If it emerged that these two species differ in terms of their tolerance towards certain toxins, then it could be difficult to make comparisons between different studies,” said Christer Erseus.

According to Erseus, as this advanced DNA technology is tested increasingly within various animal groups, it could mean that our perception of the earth’s biodiversity may need to be revised.

“There could be ten times as many species in total, compared with what we previously thought,” he said. (ANI)

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