A report on BeetleInsect and Hemolymph

Evolution has produced enormous variety in insects. Pictured are some possible shapes of antennae.
A grasshopper has an open circulatory system, where hemolymph moves through interconnected sinuses or hemocoels, spaces surrounding the organs.
Coleoptera at the Staatliches Museum für Naturkunde Karlsruhe, Germany
A pie chart of described eukaryote species, showing just over half of these to be insects
Above is a diagram of an open circulatory system. An open circulatory system is made up of a heart, vessels, and hemolymph. This diagram shows how the hemolymph is circulated throughout the body of a grasshopper. The hemolymph is first pumped through the heart, into the aorta, dispersed into the head and throughout the hemocoel, then back through the ostia that are located in the heart, where the process is repeated.
Fossil and life restoration of Moravocoleus permianus (Tshekardocoleidae) from the Early Permian of the Czech Republic, representative of the morphology of early beetles
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.
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.
Stylized diagram of insect digestive tract showing malpighian tubule, from an insect of the order Orthoptera
Fossil buprestid beetle from the Eocene (50 mya) Messel pit, which retains its structural color
Bumblebee defecating. Note the contraction of the abdomen to provide internal pressure
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.
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.
Front view of the head of Lamia textor
The different forms of the male (top) and female (bottom) tussock moth Orgyia recens is an example of sexual dimorphism in insects.
Polyphylla fullo has distinctive fan-like antennae, one of several distinct forms for the appendages among beetles.
Gulf fritillary life cycle, an example of holometabolism.
Acilius sulcatus, a diving beetle with hind legs adapted as swimming limbs
Most insects have compound eyes and two antennae.
Checkered beetle Trichodes alvearius taking off, showing the hard elytra (forewings adapted as wing-cases) held stiffly away from the flight wings
A cathedral mound created by termites (Isoptera).
A beetle's body systems
White-lined sphinx moth feeding in flight
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The backswimmer Notonecta glauca underwater, showing its paddle-like hindleg adaptation
Punctate flower chafers (Neorrhina punctata, Scarabaeidae) mating
Perhaps one of the most well-known examples of mimicry, the viceroy butterfly (top) appears very similar to the monarch butterfly (bottom).
The life cycle of the stag beetle includes three instars.
European honey bee carrying pollen in a pollen basket back to the hive
Scarabaeiform larva of Hercules beetle
Aedes aegypti, a parasite, is the vector of dengue fever and yellow fever
The ivory-marked beetle, Eburia quadrigeminata, may live up to 40 years inside the hardwoods on which the larva feeds.
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.
Photinus pyralis, firefly, in flight
A robberfly with its prey, a hoverfly. Insectivorous relationships such as these help control insect populations.
A dung beetle rolling dung
The common fruit fly Drosophila melanogaster is one of the most widely used organisms in biological research.
Hycleus sp. (Meloidae) feeding on the petals of Ipomoea carnea
Insect morphology 
A- Head B- Thorax C- Abdomen
A camouflaged longhorn beetle, Ecyrus dasycerus
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.
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

It is the major tissue type of the open circulatory system characteristic of arthropods (e.g. arachnids, crustaceans and insects).

- Hemolymph

Such nucleating agents have been found in the hemolymph of insects of several orders, i.e., Coleoptera (beetles), Diptera (flies), and Hymenoptera.

- Hemolymph

Lampyrid beetles communicate with light.

- Insect

Like other insects, beetles have open circulatory systems, based on hemolymph rather than blood.

- Beetle

The dorsal blood vessel circulates the hemolymph, arthropods' fluid analog of blood, from the rear of the body cavity forward.

- Insect

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