National Geographic News
A fossil of a bat fly in amber.

The only known fossil of a bat fly, found in ancient amber.

Photograph courtesy George Poinar, Jr., Oregon State University

Rachel Kaufman

for National Geographic News

Published February 10, 2012

The first known fossil of a rare bloodsucker called the bat fly has been found in 20-million-year-old amber. What's more, the ancient bug was host to bat malaria, an even rarer find, according to a new study.

George Poinar, Jr., an expert on insects preserved in amber at Oregon State University, discovered the bat fly in a mine in the Dominican Republic.

Although the newfound genus is extinct, bat flies still exist today, feeding exclusively on bats' blood. Some of the insects have even become specialized to live on specific bat species.

(Related: "Vampire Bats Have Vein Sensors.")

While there are hundreds of known bat fly species, most are poorly understood.

"First of all, it's hard to catch bats," Poinar said, "and [combing the bats for parasites is] like looking for fleas on mice. You don't see them."

Before Poinar discovered the amber containing the fossilized fly, nobody knew how recently the bugs had evolved to prey on bats alone. But even the 20-million-year-old fossil shows interesting bat-specific modifications, he said.

"The front legs are flattened, and they're held up between the head. These flattened legs kind of act as a plowshare, so as they are plowing along, they kind of part the hair of the bats so the [fly's] body can move all over the bat."

(Also see related pictures of bats in Panama.)

When Poinar examined the ancient fly under a microscope, he also found a new species of bat malaria, a parasitic disease so rare that perhaps five or six scientific papers have discussed it to date, he said.

The fossilized fly shows that bat malaria existed and was carried by bat flies as far back as 20 million years ago.

No Ancient Bats to Be Resurrected

Bat flies rarely leave their hosts, but they do roam in order to mate. This specimen was likely on the hunt for a partner when it got trapped in tree resin, which then fossilized to become amber.

(Related pictures: "First African Amber—Thunder Fly, Wasps, More.")

Before he became a specialist in ancient diseases inside equally ancient bugs, Poinar had worked on attempting to extract DNA from insects trapped in amber—work which author Michael Crichton has acknowledged as part of his inspiration for Jurassic Park.

But no ancient bats will be reconstructed from this specimen, even if it were possible.

"As far as I'm concerned," Poinar said, "this specimen is so rare that we wouldn't want to attempt to try it."

The bat-fly fossil is described in the February edition of Systematic Parasitology. The new species of bat malaria is reported in the December issue of Parasites and Vectors.

robert brooke
robert brooke

What family of batflies does the specimen belong to? there are two families of batflies-Streblidae and Nycteribiidae.


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