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Insect Classification

The following table shows the traditional classification of the common taxa of garden insects. In total, there are between 26 and 29 living insect orders. The exact number changes over time as new evidence on evolutionary relationships come to light. The majority of people will recognise many of these orders, at least by their common names. Others, such as the Hemiptera, may not be so familiar, but this order includes the aphids, which are known to all gardeners.

Classification table

Sub-Class Order Common name
Apteryota:
Wingless primitive insects
Thysanura Silverfish - more common in damp sheds than in the garden, medium sized, flattened, silvery scaled.
Collembola Springtails - The most common insect in soil, small, possess a jumping organ, some taxonomists do not include these with the insecta.
Pterygota:
Winged insects

Division Exopterygota:
Wings develop externally, and the young (nymphs) look like small, wingless adults.
Ephemeroptera Mayflies - Mainly aquatic, found near rivers and ponds, large wings, three "tails", large compound eyes.
Odonata Dragonflies - acrobatic aerial predators, and very large, grasping "raptorial" jaws to capture prey.
Orthoptera Crickets and grasshoppers - often found in larger gardens where grass and native trees are allowed to go a little wild, feeds on plants.
Dermaptera Earwigs - found under rocks in most gardens, elongate and dorso-ventrally flattened.
Hemiptera True bugs - feed on plant sap, using their specialised piercing, sucking mouthparts, can be large.
Pterygota:
winged insects

Division Endopterygota:
The larvae look very different to the adults, and undergo metamorphosis in a pupa where the wings develop internally.
Neuroptera Lacewings - common predators of other insects, including aphids, relatively large wings
Coleoptera Beetles - the most diverse group of organisms on Earth, some are important predators of garden pests
Diptera True flies - recognised by having just one pair wings, the second pair are modified into halteres, which act as balancing organs.
Lepidoptera Butterflies and moths - the most easily recognised garden insects, herbivorous larvae (caterpillars) feed on plants, adult feed on nectar through a long proboscis
Hymenoptera Bees, ants and wasps - critically important pollinators in every garden, many small wasps are parasitic, others induce galls on plants. Some show very complex social behaviors.