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Itsy Bitsy, Teensy Weensy, Polka-Dotted … Bugs

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A male (left) and female (right) Wallabicoris ellae from Australia and their plant host, the common firebush, or Keraudrenia intergrifolia. (Image credit: Steve Thurston)

This Research in Action article was provided to LiveScience in partnership with the National Science Foundation.

Isolated from the rest of the continents by vast stretches of ocean, Australia has an incredibly unique population of plants and animals – including one of the most diverse populations of plant bugs in the world.

Plant bugs are the largest group of true bugs (Hemiptera) on Earth, with over 10,000 known species. W. ellae is unique in that it is a relatively large species by plant bug standards, a whopping 3.5 to 4 millimeters in length. By contrast, many plant bugs are only 2 millimeters long.

Most species of plant bug have a preferred host plant, which the bugs rely on for food and as a place to lay eggs. Typically, they don't damage their host unless their population on a single plant becomes unusually large, in which case the sap-sucking critters can cause minor damage. The common firebush, a flowering shrub, isW. ellae's preferred host.

Like other plant bugs in temperate areas of the world, W. ellae has a relatively short adult life span. These bugs spend 10.5 to 11 months in the egg stage, hatching in the spring, after the winter rains trigger their host plants to grow. They then mature, mate and die within a single month. "They go through the non-egg part of their lives pretty quickly," says Schuh.

Schuh's study contributed to the Planetary Biodiversity Inventory project funded by the National Science Foundation.

Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author and do not necessarily reflect the views of the National Science Foundation.  See the Research in Action archive.

Mary Beth Griggs
Life's Little Mysteries Contributor