Curated timeline

Insect Evolution

From Marine Crustaceans to Global Dominance: A chronological guide to the origins, flight, metamorphosis, and unimaginable diversification of insects across 500 million years.

• Origin of Arthropoda (about 540 Million Years Ago)

  During the Cambrian Explosion, the first arthropods appear in the oceans. They feature jointed appendages and exoskeletons made of chitin, laying the groundwork for all future insects.

• Pancrustacea Clade Divergence (about 510 Million Years Ago)

  Genetic evidence reveals that insects are actually deeply nested within the crustacean family tree, forming the clade Pancrustacea.

• Origin of Hexapoda (about 480 Million Years Ago)

  The subphylum Hexapoda emerges. These early marine or semi-aquatic organisms consolidate their body plan to feature exactly three pairs of legs.

• Divergence of Entognatha (about 470 Million Years Ago)

  The hexapods split into the true insects (Insecta) and the Entognatha (springtails, diplurans, and proturans), which have internalized mouthparts.

• Terrestrial Colonization (about 450 Million Years Ago)

  Early hexapods and other arthropods follow the first plants onto land, adapting their respiratory systems (tracheae) to breathe atmospheric oxygen.

• Origin of True Insects (Insecta) (about 410 Million Years Ago)

  The class Insecta formally originates. Unlike their entognathous cousins, true insects have external mouthparts (ectognathous) and antennae with specific muscle structures.

• Rhyniognatha hirsti (about 400 Million Years Ago)

  Discovered in the Scottish Rhynie Chert, Rhyniognatha is one of the oldest known undisputed insect fossils, featuring distinctively advanced mandibles.

• Divergence of Archaeognatha (about 390 Million Years Ago)

  Jumping bristletails (Archaeognatha) diverge. They are wingless insects that retain monocondylic mandibles (attached by a single joint), representing a very primitive insect body plan.

• Evolution of Dicondylia (about 380 Million Years Ago)

  Insects evolve mandibles with two points of articulation (dicondylic). This allows for a much stronger, more stable biting motion, a crucial feeding adaptation.

• Divergence of Zygentoma (about 375 Million Years Ago)

  Silverfish and firebrats (Zygentoma) diverge. Though still wingless, they possess the new dicondylic mandibles and are the closest living relatives to winged insects.

• Origin of Pterygota (Flight) (about 350 Million Years Ago)

  Insects become the first animals on Earth to achieve powered flight. The origin of wings is heavily debated, possibly evolving from gills or thoracic lobes.

• Palaeodictyoptera Evolve (about 320 Million Years Ago)

  The Palaeodictyoptera, an extinct order of large, primitive winged insects with piercing beak-like mouthparts, flourish in the Carboniferous coal swamps.

• Origin of Neoptera (Wing-Folding) (about 320 Million Years Ago)

  Neoptera evolves. These insects develop specialized hinge muscles allowing them to fold their wings flat over their abdomens, enabling them to hide in tight crevices.

• Divergence of Polyneoptera (about 310 Million Years Ago)

  The Neoptera split, leading to the Polyneoptera, a massive group that includes grasshoppers, cockroaches, mantises, and earwigs.

• Origin of Endopterygota (Holometabola) (about 310 Million Years Ago)

  Holometabolism (complete metamorphosis) evolves. Insects now pass through distinct egg, larval, pupal, and adult stages, reducing competition between young and adults.

• Meganeura (Giant Griffinflies) (about 305 Million Years Ago)

  Meganeura, resembling modern dragonflies, rule the skies. Aided by high atmospheric oxygen, they reach wingspans of up to 70 cm (28 inches).

• Origin of Orthoptera (about 300 Million Years Ago)

  Grasshoppers, crickets, and katydids (Orthoptera) originate, developing specialized hind legs for jumping and stridulation mechanisms for producing sound.

• Origin of Hemiptera (True Bugs) (about 295 Million Years Ago)

  Hemipterans (true bugs, cicadas, aphids) emerge. They are defined by their highly specialized piercing-sucking mouthparts forming a rostrum.

• Origin of Dictyoptera (about 290 Million Years Ago)

  The superorder Dictyoptera emerges, representing the shared ancestry of cockroaches, termites, and mantises.

• Origin of Coleoptera (Beetles) (about 285 Million Years Ago)

  The first beetles appear. Their front wings evolve into hardened protective cases called elytra, a key adaptation that will make them the most diverse insect order.

• Permian-Triassic Extinction (about 252 Million Years Ago)

  The 'Great Dying' is the only known mass extinction to severely impact insects, wiping out many primitive orders like the Palaeodictyoptera.

• Neuroptera Evolve (about 250 Million Years Ago)

  Lacewings, antlions, and their relatives (Neuroptera) begin to diversify in the early Triassic, featuring highly veined wings and predatory larvae.

• Origin of Diptera (True Flies) (about 240 Million Years Ago)

  True flies evolve. They transform their hind wings into microscopic club-like balancing organs called halteres, granting them unmatched aerial agility.

• Coleoptera Radiation (about 240 Million Years Ago)

  Surviving the P-Tr extinction, beetles undergo a massive radiation during the Triassic, heavily utilizing their elytra to colonize diverse microhabitats.

• Origin of Hymenoptera (about 230 Million Years Ago)

  Sawflies, wasps, bees, and ants (Hymenoptera) originate. The earliest forms are phytophagous (plant-eating) sawflies.

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