The egg lid that split one stick-insect story into five species
Anchiale（AN-kee-ah-lee）
A genus, or named group, of large stick insects.
mitochondrial DNA（my-tuh-KON-dree-ul DNA）
Genetic information used to compare how closely specimens are related.
What happened
Australian researchers have shown that a group of large stick insects was miscounted. In the genus Anchiale, two animals once treated as known species are now recognized as five species in total. The study describes two species new to science, Anchiale robusta and Anchiale mabiensis. It also restores Anchiale albopunctata as a separate species after it had been placed within Anchiale briareus. The findings appear in the research paper and a University of Sydney research account.
Why the insects were easy to mix up
A stick insect can vary in color and body size even within one species. That made appearance alone unreliable. The team compared insects collected in the field, museum specimens, surveys, captive populations, and citizen-science records. It also examined mitochondrial DNA from 32 Anchiale specimens. More than 1,000 observations had been logged through iNaturalist and the Atlas of Living Australia. These insects were often seen, yet their scientific identities had not been fully sorted out.
The researchers therefore treated classification like a detective case. They looked for several clues that pointed to the same answer. Body shape, wing patterns, eggs, genes, and location all helped separate the species. The result was not simply a new name. It was a revised map of which insects live where.
The egg clue
Anchiale mabiensis has so far been recorded only in Queensland’s Mabi Forest, on the Atherton Tablelands. Females are about 11.5 centimeters long. Their eggs are brown and less shiny than those of other Australian Anchiale. Most strikingly, the lid of each egg has two or three rings. The paper says this kind of inner ring has not previously been recorded in stick insects, or in the wider related group called orthopteroid insects. The study identifies the feature, but does not establish what the rings do.
Anchiale robusta is larger. Females can reach about 16.2 centimeters. The species lives in coastal rainforest from Tully to north of Cooktown, across a range of at least 450 kilometers. It had been familiar to scientists and insect enthusiasts, but DNA and body features showed that it had been misidentified for decades.
Why the revision matters
This changes more than a species list. If two supposed species are actually five, each one may occupy a smaller range than researchers thought. That matters for conservation. Mabi Forest is a threatened ecological community, and parts of its original area have been cleared for agriculture. A species found only there may need more focused attention than a wider-ranging insect.
The revision also affects practical management. One Anchiale species is known for outbreaks that can strip leaves from trees. If several species were treated as one, scientists could misjudge where forestry or agricultural impacts come from. Better identification gives those decisions a clearer starting point.
What is confirmed—and what remains open
The study supports five Australian Anchiale species: two newly described species, plus the restored A. albopunctata and two previously recognized species. The evidence combines anatomy, DNA, eggs, and distribution. A likely additional species from Cape York was also noticed, but more specimens are needed before it can receive a name.
The purpose of the unusual egg rings is still unknown. The wider evolutionary history of Anchiale also needs more sampling outside Australia, especially in the Papuan region. The next step is therefore careful collection, comparison, and mapping. A creature can be common in photographs and still hide important biological differences.
Sources: the research paper, Phys.org, and ABC News.
Scientists found five stick-insect species, not two
📰 Full story: The egg lid that split one stick-insect story into five species
DNA, body shapes, and eggs revealed hidden differences among familiar insects.
Anchiale（AN-kee-ah-lee）
The name of a group of large Australian stick insects.
DNA（dee-en-ay）
Information that helps define a living thing’s traits.
💡 The gist
- Australian researchers changed two known species into five.
- Two species are new to science.
- One new species has rings on its egg lid.
What did scientists find?
Anchiale is a group of large Australian stick insects. Researchers studied this group in Queensland and nearby areas. They described two new species. Their names are Anchiale robusta and Anchiale mabiensis. They also separated Anchiale albopunctata from another species.
That changed the total from two species to five. The insects often look alike. Their colors and sizes can also change within one species. So, looks alone can be confusing.
How did they tell them apart?
Scientists compared body shapes, wings, eggs, and DNA. DNA is information that helps define a living thing’s traits. They also studied museum specimens and insects found by citizens. More than 1,000 observations helped the team notice where the insects lived.
Anchiale mabiensis lives in Mabi Forest in Queensland. Females are about 11.5 centimeters long. Its eggs are brown and not very shiny. Each egg lid has two or three rings. Scientists have not recorded these rings in stick insects before.
Anchiale robusta is larger. Females can reach about 16.2 centimeters. It lives in coastal rainforest across at least 450 kilometers. People had known this insect for years. However, scientists had given it the wrong name.
Why does this matter?
A species’ name tells scientists where to look for it. It also helps them decide what needs protection. Mabi Forest has lost some land to farming. The forest is also a threatened ecological community. A species found only there may need special care.
Some Anchiale insects can grow very numerous. They may remove many leaves from trees. Separating the species can help scientists understand these outbreaks. It can also help forestry and farming decisions.
One possible extra species was found in Cape York. Scientists need more specimens before confirming it. They also do not know what the rings on the eggs do.
Sources: the research paper and the research report.
The twig bugs were really five kinds
📰 Full story: The egg lid that split one stick-insect story into five species
Scientists found new clues in the bugs and their eggs.
Anchiale（AN-kee-ah-lee）
The name for some Australian stick insects.
DNA（dee-en-ay）
Tiny information that helps show which bugs are family.
Anchiale is a group of Australian stick insects. They look a little like twigs.
Scientists found two new kinds. They also moved one old kind. So, two kinds became five kinds.
One new kind lives in Mabi Forest. Mabi Forest is a rainforest in Queensland. Its eggs have little lids. The lids have two or three rings. Scientists had never seen rings like these.
Scientists looked at the bugs. They looked at the eggs too. They checked DNA. DNA is tiny body information. It helps show which bugs are family.
Another new kind was known for years. People had simply used the wrong name.
Mabi Forest has lost some land. Some land became farmland. Knowing what lives there can help protect it.
Scientists also saw a possible new kind. They need more bugs to be sure. They still do not know what the egg rings do.
Sources: the research paper and the research report.