6817. What is Riptortus linearis?

 

WILDLIFE SINGAPORE. What is this photograph about?

TEXT OVERLAY:  The photograph shows an adult Riptortus linearis feeding on the underside of a leaf or possibly probing plant tissue. Riptortus linearis is commonly called the bean pod bug or pod-sucking bug. It is an important agricultural pest in tropical and subtropical Asia.

 

Appearance: Slender, brownish insect, usually around 15–20 mm long.

Legs: The hind legs are somewhat enlarged, although not as dramatically leaf-like as some other Coreidae.

Feeding: It has a piercing-sucking rostrum (beak) that it inserts into plant tissues to suck sap.

Host plants: Particularly associated with legumes, including soybean, beans and various wild leguminous plants.

Nymphs: Younger insects are generally more colourful and can have a somewhat ant-like appearance. 

 

TEXT OVERLAY: Several features of my photograph strongly support Riptortus linearis:

• Very slender, elongated brown body — characteristic of Riptortus.
• Extremely long, thin antennae.
• Long, narrow legs, particularly the hind legs.
• A prominent piercing-sucking rostrum extending from the head.
• The insect is positioned with its rostrum inserted into the plant, exactly as expected for a pod-sucking coreid.
• The overall body proportions are quite distinctive from the more robust shield-shaped stink bugs.

TEXT OVERLAY: Riptortus linearis is a species of coreid bug (leaf-footed bug) in the family Coreidae. It is commonly known as the bean pod bug and is an important agricultural pest in tropical and subtropical Asia.

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What is Riptortus linearis?

Riptortus linearis is a species of coreid bug (leaf-footed bug) in the family Coreidae. It is commonly known as the bean pod bug and is an important agricultural pest in tropical and subtropical Asia.

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🪲 Key characteristics

• Scientific name: Riptortus linearis
• Family: Coreidae
• Order: Hemiptera
• Appearance: Slender, brownish insect, usually around 15–20 mm long.
• Legs: The hind legs are somewhat enlarged, although not as dramatically leaf-like as some other Coreidae.
• Feeding: It has a piercing-sucking rostrum (beak) that it inserts into plant tissues to suck sap.
• Host plants: Particularly associated with legumes, including soybean, beans and various wild leguminous plants.
• Nymphs: Younger insects are generally more colourful and can have a somewhat ant-like appearance.

🌱 Why it matters

Riptortus linearis is particularly notorious as a pod-sucking pest of soybean. Adults and nymphs pierce developing pods and seeds, potentially causing:

• shrivelled or poorly developed seeds
• damaged soybean pods
• reduced seed quality
• premature pod or seed drop
• reduced crop yield

It is therefore an important pest in soybean-growing regions of Southeast Asia.

🇸🇬 If you saw one in Singapore

If you photographed this insect in Singapore, it would be interesting to see the photograph because several Coreidae species look quite similar. A photo showing the insect's dorsal (top) side and hind legs would make identification much more reliable.

If you upload your photograph, I can help determine whether it is actually Riptortus linearis or another Singaporean leaf-footed/coreid bug, and point out the identifying features.

 

 

Yes — the insect in your photograph is very consistent with Riptortus linearis, commonly called the bean pod bug or pod-sucking bug.

What I can see in your photograph

Several features strongly support Riptortus linearis:

• Very slender, elongated brown body — characteristic of Riptortus.
• Extremely long, thin antennae.
• Long, narrow legs, particularly the hind legs.
• A prominent piercing-sucking rostrum extending from the head.
• The insect is positioned with its rostrum inserted into the plant, exactly as expected for a pod-sucking coreid.
• The overall body proportions are quite distinctive from the more robust shield-shaped stink bugs.

The photograph appears to show an adult Riptortus linearis feeding on the underside of a leaf or possibly probing plant tissue.

One interesting point about your photograph

The insect's feeding behaviour is particularly revealing. R. linearis uses its stylet-like mouthparts to penetrate plant tissue and withdraw fluids. On leguminous plants, it can penetrate developing pods and seeds, which is why it is an economically important agricultural pest.

Your photograph is actually a good example of why the common name "pod-sucking bug" is appropriate.

If this was photographed in Singapore, I would describe the identification conservatively as:

Riptortus linearis (bean pod bug), adult — Coreidae, Hemiptera.

There are other slender Coreidae in Singapore that can look similar, so a dorsal view showing the entire body and especially the pronotum, abdomen and hind legs would allow a more rigorous species-level confirmation.