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Click here for Orthoptera checklist from the Great Smoky Mountains.
"The more than 20,000 species in this order have a worldwide distribution but are most diverse in the tropics. Body size
varies from less than 5 mm to some of the world's largest insects, with body lengths up to 11.5 cm,and wingspans of over
22 cm. Orthopterans are a common component of terrestrial insect faunas and include some of the most voracious pests
(locusts and certain katydids). Members of both suborders are generally phytophagous but many species are omnivores.
Females of most species lay clutches of eggs, either in the ground or in vegetation. Some of the best examples of cryptic
coloration are seen in this group, involving mimicry of leaves and other vegatation or other resemblance to the background
(Chopard 1938; Hewitt 1979; Kevan 1982; Rentz 1991). Grasshoppers, katydids and crickets are well known for their
abilities to jump and particularly for singing by males (females are typically silent). There are few places in the world where
the calls of grasshoppers (usually diurnal), katydids and crickets (usually nocturnal) cannot be heard during warm seasons.
Organs of sound production and sound reception involve quite different body parts in the two subgroups (Alexander 1960;
Dumortier 1963)."-- (N.C. State University Entomology Dept.)
The name Orthoptera, derived from the Greek "ortho" meani
ng straight and "ptera" meaning wing, refers to the parallel-sided structure of the front
wings (tegmina). -- (N.C. State University Entomology Dept.)
(N.C. State University Entomology Dept.)
Orthoptera probably arose during the middle of the Carboniferous period. Most living members of this order are
terrestrial herbivores with modified hind legs that are adapted for jumping. Slender, thickened front wings fold back
over the abdomen to protect membranous, fan-shaped hind wings. Many species have the ability to make and detect
sounds. Orthoptera is one of the largest and most important groups of plant-feeding insects.
Orthoptera is generally regarded as a dominant group in most terrestrial habitats. These insects feed on all types of
plants and often cause serious economic damage. Swarms of grasshoppers (locusts) regularly appear in parts of Africa,
Asia, and North America and destroy crops over wide land areas. Mole crickets are major pests in lawns and golf
courses in the southern United States. Several species of field crickets are reared commercially as fish bait.
In many species of Orthoptera, the males use sound signals (chirping or whirring)
in order to attract a mate. The sound is produced by stridulation -- rubbing
the upper surface of one wing against the lower surface of another wing, or the
inner surface of the hind leg against the outer surface of the front wing.
Each stridulating species produces a unique mating call. In fact, some species
may be so similar to each other that they can only be distinguished by their mating calls.
Many grasshoppers produce ultrasonic mating calls (above the range of human hearing).
In some species, the sounds may be as high as 100 kHz. (Human hearing extends to about 20 kHz.)
Species that produce sound also have auditory (tympanal) organs. In crickets and katydids,
these "ears" are on the tibia of the front legs. In grasshoppers, they are on
the sides of the first abdominal segment.
The snowy tree cricket, Oecanthus fultoni (family Gryllidae), is often
called the temperature cricket. Adding 40 to the number of chirps it makes in
15 seconds will equal the ambient temperature in degrees Fahrenheit.
The redlegged grasshopper (Melanoplus femurrubrum) is not only a crop pest
but also the intermediate host for a tapeworm (Choanotaenia infundibulum) that infests poultry.
Alexander, R.D. 1960. Sound communication in Orthoptera and Cicadidae. In: Animal Sounds and Communication
(Eds. W. E. Lanyon and W. N. Tavolga), Amer. Instit. Biol. Sci. No.7., Washington, D.C.:38-92.
Chopard, L. 1938. La biologie des Orthoptères. Encycl. ent. Ser. A 20:iV:1-541.
Dumortier, B. 1963. The physical characteristics of sound emissions in Arthropoda.
In: Acoustic Behaviour in Animals (edited by R.-G. Busnel). Amsterdam: Elsevier.
Hewitt, G.M. 1979. Orthoptera: grasshoppers and crickets. Berlin: Gerbruder Borntrager.
Kevan, D.K. McE. 1982. Orthoptera. In: Synopsis and Classification of Living Organisms (edited by S. P. Parker). New York.
Rentz, D.C.F. 1991. Orthoptera. In: Insects of Australia (edited by CSIRO). Melbourne: Melbourne University Press.
This page was written by Aeneas Murnane, Biology major.
Thanks to Sabina Gupta, Denise Lim, and Dr. John Pickering for technical and web support in developing this page.
Order Othoptera – Â Crickets, Grasshoppers & Katydids
Two-Striped Grasshopper – Melanoplus bivittatus
Melanoplus bivittatus
, commonly called the two-striped grasshopper, is one of the most common hoppers in North America. This decidedly blue specimen is an egg-laden female found at 6500 foot elevation in the Rocky Mountains near Dotsero, Colorado. Melanoplus grasshoppers are herbivorous, feeding on grasses and leafy plants.
We used to love catching these things when I was a kid. Except for the “tobacco juice” they spit on your hands. What the hell is that stuff? I have been known to sacrifice these creatures to the
Goddess Argiope, of the land of black-and-yellow garden spiders
. It is a grisly spectable indeed, but one I nevertheless thoroughly enjoy. Much as I hate to see anything suffer, my flexible ethical system seems able to rationalize this.
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, with the membranous hind wings used for flight, while the front wings (tegmina) are used as covers for the flying wings, much as beetles use their hardened
elytra
. Females are almost always larger than males. 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 and other substrates when egg laying.
There are more than 20,000 species in the order Orthoptera
. These diverse insects are found worldwide, although their numbers are concentrated in the tropics. They vary in size from less than 5mm to monster-big grasshoppers over 4 inches long, with 10-inch wingspans. Orthopterans are some of the most common insects in many landscapes, and the order includes some of the most destructive agricultural pests in the locusts and katydids. Most eat plants, but some species are omnivorous.Â
Orthoptera Index
Northern Green-striped Grasshopper laying eggs
Females typically lay clutches of eggs either in the ground or on vegetation. The lovely green goddess above was doing her thing right in the middle of a forest preserve path made of limestone scalings. Grasshoppers, crickets and katydids are all well-known for their jumping ability as well as the singing performed by the males (females are generally silent.)Â Grasshoppers are almost all active in the daytime, but crickets are nocturnal. Katydids are thought to be nocturnal, but I see an awful lot of them out and about when the sun is shining. There are few places on earth where the calls of these intriguing insects are not heard nearly constantly during the warm months.
The first fossil records of the order appear in the upper Carboniferous, or Pennsylvanian era, 310 – 290 million years ago.
Striped Ground Cricket – Allonemobius fasciatus
This female’s sword-like ovipositor is inconspicuous under the superbly camouflaged body. You can hardly see these creatures in the leaf litter.
True crickets (Family Gryllidae)
are harmless, nocturnal insects famous for their chirping, technically known as
stridulation
. The sound has become a literal indication of “nothing happening,” in popular culture.
Say’s Trig Cricket – Anaxipha exigua
Say’s Trig male
‘s antennae are 3x his body length. I chased this shy creature about in the underbrush at Allegheny Nat’l Forest in Pennsylvania. I love the little rocket-ship tail fins, called
cerci,
on this beauty (
cercus
noun, plural
cerci)
– typically paired appendages at the tip of the abdomen, usually having sensory functions. Cerci are often enlarged in males, and used in copulation. In some groups, such as
earwigs
, they are enlarged and used for defense. [1]
Only male crickets chirp, usually to attract females or repel other males. In a nutshell: the sound is produced when the cricket rubs the serrated edges of his wings together. A more specific description: “On the margin of the wingcover, a thickened point is observed from which several strong veins diverge, forming angles. The largest and strongest of these veins, which runs towards the base of the left wing cover, is regularly notched like a file. The wing covers being closed, this oblique bar lies upon the corresponding part of the right wing cover, and when a tremulous motion is given the wing covers the bar on the left rubs against the bar on the right, producing the familiar sound.”
Two-Spotted Tree Cricket – Neoxabea bipunctata
This is a very shy, immature tree cricket. This coy cutie has, at her business end, nascent ovipositor and cerci.
Like many processes in cold-blooded animals, the cricket’s rate of chirping is dependant on the ambient air temperature, and it is possible to calculate approximate air temperature in degrees Fahrenheit by counting the chirps per 14 seconds and adding 40.
Katydids are large green insects with long antennae and large wings, eminently capable of flight. Most katydids are well-camouflaged in foliage and become virtually invisible amidst greenery the identical color. Family Tettigoniidae contains about 6000 species in 1070 genera.
This from Tree of Life: “Katydids are found on all continents except Antarctica and in an assortment of habitats from tropical forests (Heller 1995) and peat bogs (Vickery and Kevan 1985) to montane alpine zones ‘far above the last outposts of trees’. Within these habitats, virtually all tettigoniids are associated with vegetation, particularly during inactive periods when the insects retreat into (or onto) leaves. Katydids are omnivorous, feeding on vegetation, seeds, carrion and occasional prey.”Â
Orthoptera Index
Bush Katydid nymph – Scudderia sp.
Called bush-crickets by the Brits, these charming creatures are capable of stridulation (the males, that is) and the background noise in such locations consists largely of their songs along with their close relatives, the crickets. As you can see, the camouflage is superb, matching exactly the color of the surrounding greenery, and their wing veins closely resemble patterns in the leafy foliage they mimic.
Family: Tetrigidae – Pygmy Grasshoppers
Identification: similar in form to Acrididae, usually associated with wet areas. Less than 20 mm length, often smaller. Pronotum is highly elongated, tapered, and usually covers abdomen tegmina. Forewings are small, padlike, sometimes absent, may be exposed or covered by pronotum. Front and middle tarsi with 2 segments, hind tarsi with 3 segments.
A single species can have short-winged and long-winged forms, or lack wings altogether–these forms may appear quite different. Auditory and stridulatory organs absent. Coloration and pattern, even within a single species, are variable. Often strongly sexually dimorphic, both in size (females usually larger) and in coloration. Some specimens appear green due to an external growth of algae. [1]
This specimen was photographed in early spring, about 3 feet from a pond in Warrenville, Illinois. It was not particulary wary, as I was able to position it a bit with a leaf before it finally, energetically sprang away. Ambient temperature was only about 50 degrees.Â
Orthoptera Index
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