Portal:Insects

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Insects (from Latin insectum) are hexapod invertebrates of the class Insecta. They are the largest group within the arthropod phylum. Insects have a chitinous exoskeleton, a three-part body (head, thorax and abdomen), three pairs of jointed legs, compound eyes, and a pair of antennae. Insects are the most diverse group of animals, with more than a million described species; they represent more than half of all animal species. (Full article...)

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Clockwise from top left: female golden stag beetle (Lamprima aurata), rhinoceros beetle (Megasoma sp.), long nose weevil (Rhinotia hemistictus), cowboy beetle (Chondropyga dorsalis), and a species of Amblytelus

Beetles are insects that form the order Coleoptera (/koʊliːˈɒptɛrə/), in the superorder Holometabola. Their front pair of wings are hardened into wing-cases, elytra, distinguishing them from most other insects. The Coleoptera, with about 400,000 described species, is the largest of all orders, constituting almost 40% of described arthropods and 25% of all known animal species; new species are discovered frequently, with estimates suggesting that there are between 0.9 and 2.1 million total species.

Found in almost every habitat except the sea and the polar regions, they interact with their ecosystems in several ways: beetles often feed on plants and fungi, break down animal and plant debris, and eat other invertebrates. Some species are serious agricultural pests, such as the Colorado potato beetle, while others such as Coccinellidae (ladybirds or ladybugs) eat aphids, scale insects, thrips, and other plant-sucking insects that damage crops. Some others also have unusual characteristics, such as fireflies, which use a light-emitting organ for mating and communication purposes. (Full article...)

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... that the extinct Phlebotominae sandfly Pintomyia falcaorum is known only from Miocene age Dominican amber found on Hispaniola?
... that although true bugs eat aphids, they help the aphids by eating another predator, young lacewings?
... that the ground beetle, Lebia grandis, can eat about 23 eggs or three larvae of the Colorado potato beetle every day?
... that the weevil Hylobius transversovittatus has been introduced into the United States and Canada to help control the invasive wetland plant Lythrum salicaria (purple loosestrife)?
... that the larva of the Texas beetle, Brachypsectra fulva, can live for over two years without feeding?

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The following are images from various insect-related articles on Wikipedia.

Image 1Male genitalia of Lepidoptera (from Insect reproductive system)
Image 2Mayfly nymph with paired abdominal gills (from Insect flight)
Image 3Stylized diagram of insect digestive tract showing malpighian tubule, from an insect of the order Orthoptera. (from Insect morphology)
Image 4The development of insect mouthparts from the primitive chewing mouthparts of a grasshopper in the center (A), to the lapping type (B) of a bee, the siphoning type (C) of a butterfly and the sucking type (D) of a female mosquito.
Legend: a – antennae
c – compound eye
lb – labium
lr – labrum
md – mandibles
mx – maxillae (from Insect morphology)
Image 5Hoverfly (Philhelius pedissequum) has indirect flight musculature. (from Insect flight)
Image 6Evolution has produced astonishing variety of appendages in insects, such as these antennae. (from Evolution of insects)
Image 7Larva of beetle, family Cerambycidae, showing sclerotised epicranium; rest of body hardly sclerotised (from Insect morphology)
Image 8A pie chart of described eukaryote species, showing just over half of these to be insects (from Insect biodiversity)
Image 9Diagram of a typical insect leg (from Insect morphology)
Image 10Fossil gnat in amber, a well-preserved insect fossil. (from Evolution of insects)
Image 11A tau emerald (Hemicordulia tau) dragonfly has flight muscles attached directly to its wings. (from Insect flight)
Image 12Head of Orthoptera, Acrididae. a:antenna; b:ocelli; c:vertex; d:compound eye; e:occiput; f:gena; g:pleurostoma; h:mandible; i:labial palp; j:maxillary palps; k:maxilla; l:labrum; m:clypeus; n:frons (from Insect morphology)
Image 13Generalized arthropod biramous limb. Trueman proposed that an endite and an exite fused to form a wing. (from Insect flight)
Image 14Indian moon moth (Actias selene) with some of the spiracles identified (from Respiratory system of insects)
Image 15Larva of Syrphid fly, member of Cyclorrhapha, without epicranium, almost without sclerotisation apart from its jaws. (from Insect morphology)
Image 16Cross-section of wing vein (from Insect morphology)
Image 17The abdominal terminus of male scorpionflies is enlarged into a "genital bulb", as seen in Panorpa communis (from Insect morphology)
Image 18Reconstruction of a Carboniferous insect, the palaeodictyopteran Mazothairos (from Insect flight)
Image 19
Insect morphology
Legend of body parts
Tagmata: A – Head, B – Thorax, C – Abdomen.
1. antenna
2. ocelli (lower)
3. ocelli (upper)
4. compound eye
5. brain (cerebral ganglia)
6. prothorax
7. dorsal blood vessel
8. tracheal tubes (trunk with spiracle)
9. mesothorax
10. metathorax
11. forewing
12. hindwing
13. mid-gut (stomach)
14. dorsal tube (heart)
15. ovary
16. hind-gut (intestine, rectum & anus)
17. anus
18. oviduct
19. nerve cord (abdominal ganglia)
20. Malpighian tubes
21. tarsal pads
22. claws
23. tarsus
24. tibia
25. femur
26. trochanter
27. fore-gut (crop, gizzard)
28. thoracic ganglion
29. coxa
30. salivary gland
31. subesophageal ganglion
32. mouthparts
(from Insect morphology)
Image 20Closeup of a fire ant, showing fine sensory hairs on antennae (from Insect morphology)
Image 21Mandibles of Rhyniognatha hirsti, it may be one of the oldest insects, but also possible to be a myriapod. (from Evolution of insects)
Image 22Venation of insect wings, based on the Comstock-Needham system (from Insect morphology)
Image 23Variety of male structures in Phlebotominae (Diptera, Psychodidae) (from Insect reproductive system)
Image 24Frenulo-retinacular wing coupling in male and female moths (from Insect flight)
Image 25Direct flight: muscles attached to wings. Large insects only (from Insect flight)
Image 26Mazothairos, a Carboniferous member of the now extinct order Palaeodictyoptera. (from Evolution of insects)
Image 27Scanning electron micrograph of a cricket spiracle valve (from Respiratory system of insects)
Image 28Bumblebee defecating. Note the contraction of the anus, which provides internal pressure. (from Insect morphology)
Image 29The Odonata (dragonflies and damselflies) have direct flight musculature. (from Insect flight)
Image 30Queen Alexandra's birdwing (Ornithoptera alexandrae) of Papua New Guinea (from Insect biodiversity)
Image 31The female genitalia of Lepidoptera (from Insect reproductive system)
Image 32Reconstruction of Strudiella devonica as a possible hexapod (from Evolution of insects)

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Credit: Chrumps

The rose chafer Cetonia aurata (Coleoptera: Scarabaeidae) is a beetle, 20 mm (¾ in) long, that has metallic green coloration.

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