Grasshopper Information

Grasshopper Information Phylum, Arthropoda; Class, Insecta; Order, Orthoptera

Identifying Features Appearance (Morphology) •

Brown, with some darker markings

•

Black herringbone pattern on hind femur

•

Big hind legs for jumping

•

2 pairs of wings: forewings narrow and relatively hard; hind wings large, membranous

•

Antennae not very long, 20-24 segments

•

Conspicuous eyes

•

Cerci (pair of appendages at end of abdomen) unjointed Adult Males and Females Males have a single unpaired plate at the end of abdomen. Female has two pairs of valves (triangle shapes) at end of abdomen used to dig in sand when egg laying. Immatures (different stages) In very young stage, the grasshopper has no wings. In later stages, wings are visible as small pads at end of thorax.

Natural History Food Many species of grasshoppers are general herbivores feeding on a variety of plants. Some species only like grasses. Habitat Widespread in U.S. Predators Birds, lizards,mantids, spiders, and rodents eat grasshoppers. Interesting Behaviors Feeding: Although they eat many things, they still have preferences. Mating behavior: See how male courts female. Egg-laying: Female digs hole with abdomen. Some grasshoppers spit a brown bitter liquid as a defensive behavior in response to being handled. Use a piece of white paper and gently wipe the grasshopper's mouth if the spit is not evident. Before molting, grasshoppers do not eat and become less active. During the molt, they swallow air to build up pressure to split the old cuticle.

Impact on the Ecosystem Positive As herbivores, grasshoppers link plants to the rest of the ecosystem. Frass (droppings) contribute to nutrient turnover by returning nutrients as fertilizer for the plants. They provide food for birds and other

arthropods. Negative Sometimes some species of grasshopper occur in very large numbers and cause serious crop damage and loss of plants in pastures.

Collecting Live Insects Where to find Grasshoppers are around in the spring and summer, but are most noticeable in the autumn. Areas with many grasses, small "vacant" lots and gardens are good places to start looking. Look at the area as you walk through. If you can hear the plants moving as you walk there are most likely grasshoppers around. Look during the middle of the day for best results. At night, use a flashlight to find grasshoppers roosting on the leaves. In the summer and autumn, some grasshoppers fly into porch lights. How to collect Encourage students to bring in grasshoppers. Catching grasshoppers may require patience and determination. Once grasshoppers have wings, many species can fly faster than you can run. Those without wings are easier to chase. Grasshoppers are perceptive and can sense you when you are several feet away. If they are on a plant and you try to grab them, they will move around the stem and often drop off the plant. You can swing an insect net or place the net over the plant while holding up the bottom of the net. With your hand gently coax grasshoppers into the net. They will walk or jump up into the net. Once in the net, gently pick up the grasshopper and place it in a container. It is also possible to collect grasshoppers by very slowly moving a glass or plastic vial towards the grasshopper's head and they will jump into it.

Grasshoppers have antennae that are almost always shorter than the body (sometimes filamentous), and short ovipositors. Those species that make easily heard noises usually do so by rubbing the hind femurs against the forewings or abdomen (stridulation), or by snapping the wings in flight. Tympana, if present, are on the sides of the first abdominal segment. The hind femora are typically long and strong, fitted for leaping. Generally they are winged, but hind wings are membranous while front wings (tegmina) are coriaceous and not fit for flight. Females are normally larger than males, with short ovipositors. Males have a single unpaired plate at the end of the abdomen. Females have two pairs of valves ( triangles) at the end of the abdomen used to dig in sand when egg laying. They are easily confused with the other sub-order of Orthoptera, Ensifera, but are different in many aspects, such as the number of segments in their antennae and structure of the ovipositor, as well as the location of the tympana and modes of sound production. Ensiferans have antennae with at least 20-24 segments, and caeliferans have fewer. In evolutionary terms, the split between the Caelifera and the Ensifera is no more recent than the PermoTriassic boundary (Zeuner 1939).

[edit] Diversity and range Recent estimates (Kevan 1982; Günther, 1980, 1992; Otte 1994-1995; subsequent literature) indicate some 2,400 valid Caeliferan genera and about 11,000 valid species described to date. Many undescribed species exist, especially in tropical wet forests. The Caelifera are predominantly tropical.

[edit] Biology [edit] Digestion and excretion

The digestive system of insects includes a foregut (stomodaeum, the mouth region), a hindgut (proctodaeum, the anal region), and a midgut (mesenteron). The mouth leads to the muscular pharynx, and through the esophagus to the crop. This leads to the malpighian tubules. These are the chief excretion organs. The hindgut includes intestine parts (including the ileum and rectum), and exits through the anus. Most food is handled in the midgut, but some food residue as well as waste products from the malpighian tubules are managed in the hindgut. These waste products consist mainly of uric acid, urea and amino acids, and are normally converted into dry pellets before being disposed of. The salivary glands and midgut secrete digestive enzymes. The midgut secretes protease, lipase, amylase, and invertase, among other enzymes. The particular ones secreted vary with the different diets of grasshoppers. [edit] Nervous system

The grasshopper's nervous system is controlled by ganglia, loose groups of nerve cells which are found in most species more advanced than cnidarians. In grasshoppers, there are ganglia in each segment as well as a larger set in the head, which are considered the brain. There is also a neuropile in the centre, through which all ganglia channel signals. The sense organs (sensory neurons) are found near the exterior of the body and consist of tiny hairs (sensilla), which consist of one sense cell and one nerve fibre, which are each specially calibrated to respond to a certain stimulus. While the sensilla are found all over the body, they are most dense on the antennae, palps (part of the mouth), and cerci (near the posterior). Grasshoppers also have tympanal organs for sound reception. Both these and the sensilla are linked to the brain via the neuropile.

Romalea guttata grasshoppers mating

Common Macrotona (Macrotona australis) laying eggs [edit] Reproduction

The grasshopper's reproductive system consists of the gonads, the ducts which carry sexual products to the exterior, and accessory glands. In males, the testes consist of a number of follicles which hold the spermatocytes as they mature and form packets of elongated spermatozoa. During reproduction, the male grasshopper introduces sperm into the ovipositor through its aedeagus (reproductive organ), and inserts its spermatophore, a package containing the sperm, into the female's ovipositor. The sperm enters the eggs through fine canals called micropyles. The female then lays the fertilized egg pod, using her ovipositor and abdomen to insert the eggs about one to two inches underground, although they can also be laid in plant roots or even manure. The egg pod contains several dozens of tightly-packed eggs that look like thin rice grains. The eggs stay there through the winter, and hatch when the weather has warmed sufficiently. In temperate zones, many grasshoppers spend most of their life as eggs through the cooler months (up to 9 months) and the active states (young and adult grasshoppers) live only up to three months. The first nymph to hatch tunnels up through the ground, and the rest follow. Grasshoppers develop through stages and progressively get larger in body and wing size. This development is referred to as hemimetabolous or incomplete metamorphosis since the young are rather similar to the adult. [edit] Circulation and respiration

Grasshoppers have open circulatory systems, with most of the body fluid (haemolymph) filling body cavities and appendages. The one closed organ, the dorsal vessel, extends from the head through the thorax to the hind end. It is a continuous tube with two regions: the heart, which is restricted to the abdomen; and the aorta, which extends from the heart to the head through the thorax. Haemolymph is pumped forward from the hind end and the sides of the body through a series of valved chambers, each of which contains a pair of lateral openings (ostia). The haemolymph continues to the aorta and is discharged through the front

of the head. Accessory pumps carry haemolymph through the wing veins and along the legs and antennae before it flows back to the abdomen. This haemolymph circulates nutrients through the body and carries metabolic wastes to the malphighian tubes to be excreted. Because it does not carry oxygen, grasshopper "blood" is green. Respiration is performed using tracheae, air-filled tubes, which open at the surfaces of the thorax and abdomen through pairs of spiracles. The spiracle valves only open to allow oxygen and carbon dioxide exchange. The tracheoles, found at the end of the tracheal tubes, are insinuated between cells and carry oxygen throughout the body. (For more information on respiration, see Insect.)

Six stages of development, from newly-hatched nymph to fully-winged adult. (Melanoplus sanguinipes)

Grasshopper from underneath

[edit] Other information [edit] As food

In many places around the world, grasshoppers are eaten as a good source of protein. In Mexico for example chapulines are used as a snack or filling. It is served on skewers in Chinese food markets, like the Donghuamen Night Market [1] Raw grasshoppers should be eaten with caution, as they can contain tapeworms.[2] In Africa, grasshoppers are an important food source, adding proteins, fat, minerals, and vitamins to the daily diet, especially in times of food crisis. Grasshoppers are usually collected at dusk, using lamps or electric lighting, in sweep nets. They are placed in water for 24 hours, after which they can be boiled or eaten raw, sun-dried, fried, flavored with onions, or used in soup. [edit] Locusts

See also locust and desert locust. Locusts are several species of short-horned grasshoppers of the family Acrididae that sometimes form very large groups (swarms); these can be highly destructive and migrate in a more or less coordinated way. Thus, these grasshoppers have solitary and gregarious (swarm) phases. Locust swarms can cause massive damage to crops. Important locust species include Schistocerca gregaria and Locusta migratoria in Africa and the Middle East, and Schistocerca piceifrons in tropical Mexico and Central America (Mesoamerica). Other grasshoppers important as pests (which, unlike true locusts, do not change colour when they form swarms) include Melanoplus species (like M. bivittatus, M. femurrubrum and M. differentialis) and Camnula pellucida in North America; the lubber grasshopper Brachystola magna, and Sphenarium purpurascens in Northern and Central Mexico; species of Rhammatocerus in South America; and the Senegalese grasshopper Oedaleus senegalensis and the variegated grasshopper Zonocerus variegatus in Africa. [edit] In popular culture •

Aesop (620–560 BC), a slave and story-teller who lived in Ancient Greece, told a tale called The Ant and the Grasshopper. In this tale, the ant worked hard preparing his shelter and stores of food all summer, while the grasshopper played. When winter came, the ant was prepared, but the grasshopper has no shelter or food. He begs to enter the ant's house, but the ant refuses and the grasshopper starves.

•

The 1957 film Beginning of the End featured mutated giant grasshoppers attacking Chicago.

•

"Grasshopper" is a term currently used in jest referencing a person who has much to learn. Its use originated from the television show Kung Fu (1972-1975). Caine, the young student, portrayed by Radames Pera, is receiving instruction from his Master Po (portrayed by Keye Luke) who nicknames his student "Grasshopper" as a term of endearment.

•

In the 1998 movie A Bug's Life, the heroes are the members of an ant colony, and the lead villain and his henchmen are grasshoppers. In an apparent homage to the Aesop fable, The Ant and the Grasshopper, the lead villain is eaten by a bird.

•

The Japanese superhero franchise "Kamen Rider" originally had a grasshopper motif, with a grasshopper based helmet and costume. This

was later toned down in later Kamen Rider episodes, though some features of the original hero remain ("bug eyes").