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Round-keeled rhyzobius

Round-keeled rhyzobius

Rhyzobius chrysomeloides

A species of Scale-stalking lady beetles

Rhyzobius chrysomeloides is a species of beetle in the family Coccinellidae. R. chrysomeloides is a predatory species, feeding on aphids. R. chrysomeloides can typically be found on various species of trees and garden shrubs, first being recorded in Britain was in 1996 on a pine tree. R. chrysomeloides is visually similar to Rhyzoius litura, but can be differentiated by its broader prosternal keel and the darker, U-shaped markings on its elytra.

General Info About Round-keeled rhyzobius
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Attributes of Round-keeled rhyzobius
Colors
Brown
Black
Habitat
Pine; conifers; deciduous tree; Ivy; urban; rural garden; evergreen shrub
Adult Food Sources
Scale insects, aphids, spider mites, whiteflies, mealybugs
Larva Food Source
Scale insects, mealybugs, soft-bodied insects, insect eggs
Biting/stinging
Not reported
Allergy-causing
Not reported
Defensive attack
Not reported
Pest-Eating Predatory
The Round-keeled rhyzobius preys on common garden pests such as: aphids, whiteflies, thrips, spider mites, etc. It is a popular insect among gardeners.
Phytophagous
Not reported
Predatory
Not reported
Biting animal or pet
Not reported
Mouthparts Type
Chewing mouthparts
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Species Status of Round-keeled rhyzobius
Common
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Distribution Area of Round-keeled rhyzobius
Britain
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Life Cycle of Round-keeled rhyzobius
Egg The egg stage of round-keeled rhyzobius is marked by small, often oval-shaped eggs laid in groups. These are typically pale and may darken over time. During this stage, the embryonic round-keeled rhyzobius develops organ systems but remains immobile and dependent on the initial yolk for nutrients.
Larva In the larval stage, round-keeled rhyzobius exhibits a worm-like appearance with a segmented body. This stage is primarily dedicated to feeding and growth. Larvae molt several times, increasing in size with each stage, and exhibit significant changes in coloration as they develop.
Pupal Transitioning into the pupal stage, round-keeled rhyzobius enters a quiescent state. Encased within a pupal case, the insect undergoes dramatic transformation, reorganizing its body structures. External changes are minimal, but internally, the adult form of round-keeled rhyzobius is being constructed.
Adult Emerging from the pupa, the adult round-keeled rhyzobius features elytra and functional reproductive organs. Exhibiting sexual dimorphism, the once grub-like creature now has a hardened exoskeleton, vibrant colors, and wings. The adult is primarily focused on reproduction and dispersal.
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Interesting Facts About Round-keeled rhyzobius
Some round-keeled rhyzobius can produce a small quantity of glycine, an amino acid, which deters predators by giving them a bitter taste.
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Scientific Classification of Round-keeled rhyzobius
Tips for Finding Round-keeled rhyzobius
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Adult Habitat of Round-keeled rhyzobius
Forests and Woodlands, Agricultural and Cultivated Areas, Urban and Suburban Areas
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Habitat Preferences of Round-keeled rhyzobius Through Different Life Stages
The eggs of round-keeled rhyzobius are typically deposited on plants infested with prey such as aphids, often on the underside of leaves to avoid predators and harsh environmental conditions. The larvae, upon hatching, remain on the host plants, voraciously feeding on the pests. Searching for these larvae would involve inspecting leaves, especially where there are signs of aphid colonies. Pupae are generally found attached to leaves or stems near the food source. Finally, the adult round-keeled rhyzobius can be found on various plants, where they continue to prey on soft-bodied insects and can also be seen moving across the ground in search of food or mates. Observing plants heavily infested with prey could be a strategic way to find various stages of round-keeled rhyzobius.
Are Round-keeled rhyzobius harmful?
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Beneficial Effects of Round-keeled rhyzobius
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Explore how insects help as pollinators, pest predators, and biocontrol agents. From seed dispersal to decomposition, they play vital roles in our ecosystem.
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Predators of Pests
Predators of Pests
Purpose
Feed Itself
Diets
Scale Insects
Round-keeled rhyzobius is an efficient predator which actively seeks out and consumes various species of scale insects both during its larval stage and as an adult. These beetles are vital for controlling pest populations in many ecosystems and agricultural environments. Round-keeled rhyzobius does this primarily to sustain itself and ensure the survival of its offspring, thus playing a crucial role in the balance of nature.
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