A report on Beetle

Coleoptera at the Staatliches Museum für Naturkunde Karlsruhe, Germany
Fossil and life restoration of Moravocoleus permianus (Tshekardocoleidae) from the Early Permian of the Czech Republic, representative of the morphology of early beetles
Beetle genera were mainly saprophages (detritivores) in the Permian and Triassic. During the Jurassic, herbivorous and then carnivorous genera became more common. In the Cenozoic, genera at all three trophic levels became far more numerous.
Fossil buprestid beetle from the Eocene (50 mya) Messel pit, which retains its structural color
Beetle body structure, using cockchafer.
A: head, B: thorax, C: abdomen.
1: antenna, 2: compound eye, 3: femur, 4: elytron (wing cover), 5: tibia, 6: tarsus, 7: claws, 8: mouthparts, 9: prothorax, 10: mesothorax, 11: metathorax, 12: abdominal sternites, 13: pygidium.
Front view of the head of Lamia textor
Polyphylla fullo has distinctive fan-like antennae, one of several distinct forms for the appendages among beetles.
Acilius sulcatus, a diving beetle with hind legs adapted as swimming limbs
Checkered beetle Trichodes alvearius taking off, showing the hard elytra (forewings adapted as wing-cases) held stiffly away from the flight wings
A beetle's body systems
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Punctate flower chafers (Neorrhina punctata, Scarabaeidae) mating
The life cycle of the stag beetle includes three instars.
Scarabaeiform larva of Hercules beetle
The ivory-marked beetle, Eburia quadrigeminata, may live up to 40 years inside the hardwoods on which the larva feeds.
Photinus pyralis, firefly, in flight
A dung beetle rolling dung
Hycleus sp. (Meloidae) feeding on the petals of Ipomoea carnea
A camouflaged longhorn beetle, Ecyrus dasycerus
Clytus arietis (Cerambycidae), a Batesian mimic of wasps
Blister beetles such as Hycleus have brilliant aposematic coloration, warning of their toxicity.
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An Israeli Copper Flower-Chafer (Protaetia cuprea ignicollis) on a crown daisy (Glebionis coronaria)
1: Adult ambrosia beetle burrows into wood and lays eggs, carrying fungal spores in its mycangia. 
2: Larva feeds on fungus, which digests wood, removing toxins, to mutual benefit. 
3: Larva pupates.
Tenebrionid beetle in the Thar Desert
The fogstand beetle of the Namib Desert, Stenocara gracilipes, is able to survive by collecting water from fog on its back.
A scarab in the Valley of the Kings
Cotton boll weevil
Larvae of the Colorado potato beetle, Leptinotarsa decemlineata, a serious crop pest
Coccinella septempunctata, a predatory beetle beneficial to agriculture
Mealworms in a bowl for human consumption
Zopheridae in jewellery at the Texas A&M University Insect Collection
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"Remarkable Beetles Found at Simunjon, Borneo". A few of the 2,000 species of beetle collected by Alfred Russel Wallace in Borneo
Titan beetle, Titanus giganteus, a tropical longhorn, is one of the largest and heaviest insects in the world.
Scydosella musawasensis, the smallest known beetle: scale bar (right) is 50 μm.
Hercules beetle, Dynastes hercules ecuatorianus, the longest of all beetles
iridescent Protaetia cuprea feeding on thistle
iridescent Protaetia cuprea feeding on thistle

Beetles are insects that form the order Coleoptera, in the superorder Endopterygota.

- Beetle

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Overall

Evolution has produced enormous variety in insects. Pictured are some possible shapes of antennae.

Insect

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Insects (from Latin insectum) are pancrustacean hexapod invertebrates of the class Insecta.

Insects (from Latin insectum) are pancrustacean hexapod invertebrates of the class Insecta.

Evolution has produced enormous variety in insects. Pictured are some possible shapes of antennae.
A pie chart of described eukaryote species, showing just over half of these to be insects
Insects with population trends documented by the International Union for Conservation of Nature, for orders Collembola, Hymenoptera, Lepidoptera, Odonata, and Orthoptera. Of 203 insect species that had such documented population trends in 2013, 33% were in decline.
Stylized diagram of insect digestive tract showing malpighian tubule, from an insect of the order Orthoptera
Bumblebee defecating. Note the contraction of the abdomen to provide internal pressure
The tube-like heart (green) of the mosquito Anopheles gambiae extends horizontally across the body, interlinked with the diamond-shaped wing muscles (also green) and surrounded by pericardial cells (red). Blue depicts cell nuclei.
The different forms of the male (top) and female (bottom) tussock moth Orgyia recens is an example of sexual dimorphism in insects.
Gulf fritillary life cycle, an example of holometabolism.
Most insects have compound eyes and two antennae.
A cathedral mound created by termites (Isoptera).
White-lined sphinx moth feeding in flight
The backswimmer Notonecta glauca underwater, showing its paddle-like hindleg adaptation
Perhaps one of the most well-known examples of mimicry, the viceroy butterfly (top) appears very similar to the monarch butterfly (bottom).
European honey bee carrying pollen in a pollen basket back to the hive
Aedes aegypti, a parasite, is the vector of dengue fever and yellow fever
Because they help flowering plants to cross-pollinate, some insects are critical to agriculture. This European honey bee is gathering nectar while pollen collects on its body.
A robberfly with its prey, a hoverfly. Insectivorous relationships such as these help control insect populations.
The common fruit fly Drosophila melanogaster is one of the most widely used organisms in biological research.
Insect morphology 
A- Head B- Thorax C- Abdomen
Basic motion of the insect wing in insect with an indirect flight mechanism scheme of dorsoventral cut through a thorax segment with a wings, b joints, c dorsoventral muscles, d longitudinal muscles.

Lampyrid beetles communicate with light.

The elytra of this cockchafer beetle are readily distinguished from the transparent hindwings.

Elytron

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The elytra of this cockchafer beetle are readily distinguished from the transparent hindwings.
Hemelytra in Schizopteridae; figures B and C are considered "coleopteroid" as they lack membrane
Ripiphorus fasciatus-complex, female

An elytron is a modified, hardened forewing of beetles (Coleoptera), though a few of the true bugs (Hemiptera) such as the family Schizopteridae are extremely similar; in true bugs, the forewings are called hemelytra (sometimes alternatively spelled as "hemielytra"), and in most species only the basal half is thickened while the apex is membranous, but when they are entirely thickened the condition is referred to as "coleopteroid".

Blister beetle

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Ivy bee (Colletes hederae), carrying parasitic triungulins of Stenoria analis
Black blister beetle, Epicauta pennsylvanica (Meloinae: Epicautini)
Cysteodemus armatus near Ridgecrest, California in the Mojave Desert: The white coating is cuticular wax, which can vary from white to yellow in this species.
Blister beetles like this Lytta vesicatoria (Meloinae: Lyttini) can be safely handled, provided the animal is not startled, and allowed to move around freely. Otherwise, painful poisonings may occur.
Meloe violaceus (Meloinae: Meloini): Note the drop of dark orange defensive fluid on its thorax.
Mylabris quadripunctata (Meloinae: Mylabrini)
A yellow-and-black species of Actenodia, one of many known in South Africa as "CMR beetle"
Horia sp. from Bannerghatta (Bangalore)
Sitaris muralis (Nemognathinae: Sitarini)

Blister beetles are beetles of the family Meloidae, so called for their defensive secretion of a blistering agent, cantharidin.

Elateroidea

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Lampyridae Ototretinae

The Elateroidea are a large superfamily of beetles.

Strepsiptera

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Order of insects with nine extant families that include about 600 described species.

Order of insects with nine extant families that include about 600 described species.

Mengenilla moldrzyki (Mengenilidae)
A wasp (Odynerus spinipes) with a small portion of a strepsipteran's body protruding from its abdomen
Stylops melittae male
Stem-group strepsipteran Heterobathmilla kakopoios in Burmese amber
Andrena vaga male bee, with Stylops melittae mating on its abdomen

They are believed to be most closely related to beetles, from which they diverged 300–350 million years ago, but do not appear in the fossil record until the mid-Cretaceous around 100 million years ago.

Dung beetle

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Caution sign showing the importance of dung beetles in South Africa
A scarab statue at the Karnak temple complex
A scarab, depicted on the walls of Tomb KV6 in the Valley of the Kings
The beetle climbs onto the ball
The beetle starts to turn around
The beetle continues turning around
The beetle rolls the ball with its hind legs
An earth-boring dung beetle working
A dung beetle with two balls of dung
Two dung beetles fighting over a ball of dung

Dung beetles are beetles that feed on feces.

Scarabaeidae

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On this high quality closeup, head anatomic details are well visible.
Sacred scarab in a cartouche of Thutmosis III from Karnak temple of Amun-Ra, Egypt
A scarab beetle grub from Australia.

The family Scarabaeidae, as currently defined, consists of over 30,000 species of beetles worldwide; they are often called scarabs or scarab beetles.

Archostemata

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The Archostemata are the smallest suborder of beetles, consisting 45 living species in five families.

Buprestidae

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Oak Splendour Beetle (Agrilus biguttatus) specimen (Agrilinae)
Eurythyrea austriaca specimen (Buprestinae)
Temognatha alternata, a Buprestinae 2.6cm long from Cooktown, Australia
Capnodis cariosa specimen (Chrysochroinae)
Julodis ehrenbergii specimen from Greece (Julodinae)
Acmaeodera species (Polycestinae)
Unidentified species from Pune (India)
Unidentified species from Swifts Creek (Victoria, Australia)
Buprestinae (center right and lower left), Julodinae (center) and Polycestinae (others) from Charles Kerremans' Monographie des Buprestides
Dicerca obscura (subfamilia Chrysochroinae), North America
Fossil jewel beetle from the Eocene, found in the Messel Pit (Germany)
Sternocera sp., Tamil Nadu
Chrysochroa fulminans from Mindanao, Philippines
Collection of Buprestidae from Southeast Asia in Musée d'Histoire Naturelle de Lille

Buprestidae is a family of beetles known as jewel beetles or metallic wood-boring beetles because of their glossy iridescent colors.

Coccinellidae

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Clitostethus arcuatus larva, pupa and adults
Basic anatomy of a ladybird
Aggregating ladybirds in Colorado Springs, Colorado
Coccinellids covering a branch
Card cutout ladybirds for a children's nature trail
Brumoides suturalis is longitudinally striped
Unusual for a Coccinellid, the mature Rhyzobius chrysomeloides is brown and unspotted.
Coccinella transversalis, elytra in the open position
Ladybird on a strawberry plant
A specimen of Harmonia axyridis in South Africa, freshly out of its pupa. Its black spots will develop as its exoskeleton hardens.
A coccinellid photographed freshly out of its pupa, and two and four hours later
Henosepilachna guttatopustulata, a herbivore and one of the largest ladybirds, feeding on a potato leaf
This yellow-shouldered ladybird (Apolinus lividigaster) feeding on an aphid
Coccinella septempunctata
Larva
Pupal stage
Eggs with the head of a match to show the scale
Larva of Harmonia axyridis eating another one that was beginning to pupate
Full wings of a Harmonia axyridis taking flight
Coccinella septempunctata
A twenty-two spot ladybird (Psyllobora vigintiduopunctata).
Ladybird preparing to fly
Ladybird feeding on a bug on the seed head of a grass
Ladybirds mating on a leaf
alt=Ladybug Pupal Stage|Pupal Stage

Coccinellidae is a widespread family of small beetles ranging in size from 0.8 to(-).