New ant species discovered in the Amazon likely represents oldest living lineage of ants

September 15, 2008
This new species of blind, subterranean, predatory ant, Martialis heureka, was discovered in the Amazon by Christian Rabeling at the University of Texas at Austin. It belongs to the first new subfamily of living ants discovered since 1923, and is a descendant of one of the first ant lineages to evolve over 120 million years ago. Credit: Christian Rabeling, the University of Texas at Austin

A new species of blind, subterranean, predatory ant discovered in the Amazon rainforest by University of Texas at Austin evolutionary biologist Christian Rabeling is likely a descendant of the very first ants to evolve.

The new ant is named Martialis heureka, which translates roughly to "ant from Mars," because the ant has a combination of characteristics never before recorded. It is adapted for dwelling in the soil, is two to three millimeters long, pale, and has no eyes and large mandibles, which Rabeling and colleagues suspect it uses to capture prey.

The ant also belongs to its own new subfamily, one of 21 subfamilies in ants. This is the first time that a new subfamily of ants with living species has been discovered since 1923 (other new subfamilies have been discovered from fossil ants).

Rabeling says his discovery will help biologists better understand the biodiversity and evolution of ants, which are abundant and ecologically important insects.

"This discovery hints at a wealth of species, possibly of great evolutionary importance, still hidden in the soils of the remaining rainforests," writes Rabeling and his co-authors in a paper reporting their discovery this week in the Proceedings of the National Academy of Sciences.

Rabeling collected the only known specimen of the new ant species in 2003 from leaf-litter at the Empresa Brasileira de Pesquisa Agropecuária in Manaus, Brazil.

He and his colleagues found that the ant was a new species, genus and subfamily after morphological and genetic analysis. Analysis of DNA from the ant's legs confirmed its phylogenetic position at the very base of the ant evolutionary tree.

Ants evolved over 120 million years ago from wasp ancestors. They probably evolved quickly into many different lineages, with ants specializing to lives in the soil, leaf-litter or trees, or becoming generalists.

"This discovery lends support to the idea that blind subterranean predator ants arose at the dawn of ant evolution," says Rabeling, a graduate student in the ecology, evolution and behavior program.

Rabeling does not suggest that the ancestor to all ants was blind and subterranean, but that these adaptations arose early and have persisted over the years.

"Based on our data and the fossil record, we assume that the ancestor of this ant was somewhat wasp-like, perhaps similar to the Cretaceous amber fossil Sphecomyrma, which is widely known as the evolutionary missing link between wasps and ants," says Rabeling.

He speculates that the new ant species evolved adaptations over time to its subterranean habitat (for example, loss of eyes and pale body color), while retaining some of its ancestor's physical characteristics.

"The new ant species is hidden in environmentally stable tropical soils with potentially less competition from other ants and in a relatively stable microclimate," he says. "It could represent a 'relict' species that retained some ancestral morphological characteristics."

Source: University of Texas at Austin

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6 comments

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gmurphy
3 / 5 (1) Sep 16, 2008
army ants (usually from Africa but also Australia) are blind and predatory. They use their antennae to detect prey (smell and touch) http://www.insect...dex.html
KB6
4 / 5 (2) Sep 16, 2008
"...the Cretaceous amber fossil Sphecomyrma, which is widely known as the evolutionary missing link between wasps and ants..."
--
There are no intermediate fossil forms!

Just kidding ;)
hitch
1 / 5 (6) Sep 17, 2008
"There are no intermediate fossil forms! just kidding"
You shouldn't be. The only intermediates, not within the family, are speculated ones. So it's incorrect to assume an intermediate without proof. There is none. Indeed Darwinism must speculate intermediates by default because of it's underlying assumptions.

A non neo-Darwinian evolutionist would not speculate that anything is an intermediate - based on morphological similarities - without sufficient evidence. Again, there is none.
You must assume neo-Darwinian is true to even allow intermediates between families. No one disputes mere adaptations.

One need only look at what neo-Darwinians consider to be the ancestor of the whale to see how ridiculous these speculations can get.

No proof required, no evidence required just tell a nice speculative story and poof! There's your intermediate.
skelliot
5 / 5 (4) Sep 18, 2008
No offense hitch, and I hate to go ad hominem but...you are an apologist moron. Every new fossil creates two new gaps right? Keep digging in your bible for confirmation, moron.
nano999
3.7 / 5 (3) Sep 19, 2008
hitch:

Deuteronomy 23:12-14 - God gives us instructions for defecating. He says to carefully cover up all feces "for the Lord walketh in the midst of thy camp." (You wouldn't want the divine foot to step in your turds, would you?)
(from skepticsannotatedbible.com)

Are we supposed to respect this comedy?
KB6
not rated yet Sep 19, 2008
"One need only look at what neo-Darwinians consider to be the ancestor of the whale to see how ridiculous these speculations can get."
---
Here's some credible info about the "ridiculous" evolution of whales and the pertinent fossils:

http://tinyurl.com/u3nok

But I really doubt that it will change anyone's mind on the subject whatsoever. That doubt is based on years of frustrating experience.

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