MAY 29, 2016 05:51 PM PDT

Better Know a Microbe: Vampire Amoebas!

WRITTEN BY: Kerry Evans
Vampyrellids are teeny-tiny vampires. Okay, technically they’re single-celled amoebas that belong to the family Vampyrellidae. (“Teeny-tiny vampires” is way more interesting.)

These so-called “vampire amoebas” were discovered by Leon Semenowitj Cienkowski way back in 1865. They come in various shapes but are typically between 30-100 microns long. The majority are spherical with “filose pseudopods” extending from the cell body (think spheres with long spikes sticking out). The cells are free-living and live in water and soil. (Watch out for the tiny vampires under your feet!)
 
A vampire amoeba preys on green algae.

But, what makes them “vampires”? Unlike other amoebas that essentially engulf their prey, the vampire amoebas feed on their prey (algae, fungi, and even nematodes!) by poking holes in their cells and sucking out all the (yummy) juices. Hence, vampires.

A study from the 1920s described the process quite colorfully. First, the amoeba “spreads partly around the doomed cell”. Then, “within a minute or so the transverse walls of the attacked cell begin to bend gradually inward”. Once the amoeba pokes a hole in the “doomed cell”, the amoeba swells due to “the injection of algal cell contents into the animal through an oval opening”.

After feeding, the free-living amoebas join together and build “digestive cysts” where they digest their latest meal and also reproduce.

These vampires even made the news recently. UC Santa Barbara paleobiologist Susannah Porter reported finding tiny holes drilled into fossilized eukaryotes found near the Grand Canyon. She thinks these holes were probably made by vampire amoebas nearly 740 million years ago! (They’re even older than Dracula!)

There’s still one big unanswered question about the little vampires - how do they manage to poke holes in tough, rigid cell walls? According to Sebastian Hess at the University of Cologne, “the perforation of the cell wall … can be done in five to ten minutes … they must have a set of enzymes which can digest plant cell walls”.

The answer to this question could be very useful for companies interested in making biofuels from algae. Algae are easy to grow, but breaking down their cell walls isn’t so straightforward.

Sources: BBC, UC Santa Barbara, Science, Encyclopedia of Life, Wikipedia
About the Author
  • Kerry received a doctorate in microbiology from the University of Arkansas for Medical Sciences.
You May Also Like
JAN 23, 2020
Microbiology
JAN 23, 2020
New Drug Can Promote Resistance in the Flu Virus
A flu drug, while still safe and effective, encourages flu viruses to mutate, especially in children....
JAN 23, 2020
Microbiology
JAN 23, 2020
Understanding How a Superbug Spreads in the Home
Superbugs, which are pathogens that are resistant to the effects of antibiotics, are a rising threat to human health....
JAN 23, 2020
Earth & The Environment
JAN 23, 2020
Scientists Get a Closer Look at "The Plastisphere"
Plastic litter is a global problem, and some of the tiniest culprits are not visible to the naked eye. These microplastics have infiltrated the world's...
JAN 23, 2020
Immunology
JAN 23, 2020
Strep Throat Bacteria "Hides" from the Immune System
Group A Streptococcus (GAS), the bacterial species famous for sore throat infections, have a secret weapon for circumventing the immune response to bacteri...
JAN 23, 2020
Cannabis Sciences
JAN 23, 2020
Overhauling the Endocannabinoid System with High-fat, High-sugar Diet
If both the endocannabinoid system and the intestinal microbiome are affected by dietary consumption habits, wouldn’t it be reasonable to suggest tha...
JAN 23, 2020
Microbiology
JAN 23, 2020
Using a Cancer Drug to Fight Antibiotic-Resistant Pathogens
It takes a long time for a drug to be approved for use in humans; repurposing existing drugs is one way to get around that hurdle....
Loading Comments...