Evolution and Systematics
The tissue structure of cricket footpads dampens the shock of jumping due to a flexible exocuticle and dense fibers.
"The fluid within the pad between the filaments contributes to the visco-elastic behaviour of the pad, because the fluid is able to flow through the gaps between the rods, when the pad deforms during contact formation and breakage (Gorb et al. 2000). The interconnecting filaments presumably prevent rod buckling, when these are bending during contact. The pad presumably works as a damper during jump or landing at high speed of the deformation, as well as a means of replicating a complex substratum profile at slow deformation speeds. Also, the rod-like organization of the pad architecture would allow an independent local load distribution over the area of contact between pad and substrate. This would aid in an enhancement of the adaptation of the pad to imperfections of natural substrata…The structural principle, based on branching rods, contributes to holding the shape of the pad. This principle, combined with the presence of a relatively stiff superficial layer, provides the adaptability of the attachment pad to unevenness of natural substrata." (Perez Goodwyn et al. 2006:1241)
Learn more about this functional adaptation.
- Perez Goodwyn, P.; Peressadko, A.; Schwarz, H.; Kastner, V.; Gorb, S. 2006. Material structure, stiffness, and adhesion: Why attachment pads of the grasshopper (Tettigonia viridissima) adhere more strongly than those of the locust (Locusta migratoria) (Insecta: Orthoptera). Journal of Comparative Physiology A: Neuroethology, Sensory, Neural, and Behavioral Physiology. 192(11): 1233-1243.
Pads on bushcricket feet stick to vertical surfaces due to angled rods and a secreted viscous fluid.
"Like the gecko, the great green bushcricket (Tettigonia viridissima) is endowed with 'sticky' feet. It can walk on smooth vertical surfaces, and even upside down, with no trouble. Unlike the gecko, the bushcricket has smooth footpads. It relies not on van der Waals forces between the footpad and the substrate, but on design of the footpad itself. The cuticle of an insect's footpad is comprised of the soft material found just below the exoskeleton elsewhere in the body. In the bushcricket, this soft material covers another cuticle layer: a thicket of fine, branching rods that slope forwards at an angle of around 60 degrees. As the foot presses down, the rods bend and the pad molds itself around the irregular surface below, achieving the maximum contact. As a final adhesive measure, the bushcricket secretes a viscous fluid onto its pads. It actually leaves footprints when it walks. This design has an advantage over the hairy-sole system used by geckos in that the bushcricket can easily lift its legs. It does not need to 'peel' its feet off the substrate." (Courtesy of the Biomimicry Guild)
Learn more about this functional adaptation.
Molecular Biology and Genetics
Barcode data: Tettigonia viridissima
Below is a sequence of the barcode region Cytochrome oxidase subunit 1 (COI or COX1) from a member of the species.
See the BOLD taxonomy browser for more complete information about this specimen and other sequences.
-- end --
Download FASTA File
Statistics of barcoding coverage: Tettigonia viridissima
Public Records: 2
Specimens with Barcodes: 4
Species With Barcodes: 1
|This article includes a list of references, related reading or external links, but its sources remain unclear because it lacks inline citations. (June 2013)|
Tettigonia viridissima, the Great Green Bush-Cricket, is a large species of katydid or cricket belonging to the family Tettigoniidae, subfamily Tettigoniinae. This species can be encountered from Europe to Mongolia, especially in meadows, grasslands, prairies and occasionally in gardens.
The adult males grow up to 28–36 millimetres (1.1–1.4 in) long, while females reach 32–42 millimetres (1.3–1.7 in). This insect is most often completely green (but there are specimens completely yellowish or with yellow legs), excluding a rust-colored band on top of the body. The organ of the stridulation of the males is generally brown.
Tettigonia viridissima is distinguished by its very long and thin antennae, which can sometimes reach up to three times the length of the body, thus differentiating them from grasshoppers, which always carry short antennae. It could be confused with Tettigonia cantans, whose wings are a centimeter shorter than the ovipositor, or Tettigonia caudata whose hind femurs bear conspicuous black spines.
The morphology of both sexes is very similar, but the female has an egg-laying organ (ovipositor) that can reach a length of 23–32 millimetres (0.91–1.26 in). It reaches the end of the elytra and is slightly curved downward. The larvae are green and as the imago show on their back a thin brown longitudinal stripe. The ovipositor can be seen from the fifth stage; the wings appear in both genders from the sixth stage.
Tettigonia viridissima is carnivorous and arboreal. Its diet is mostly composed of flies, caterpillars and larvae. Unlike many grasshoppers, it is essentially active in day and night, as testified by its endless crepuscular and nocturnal singing.
The species can bite painfully but is not particularly aggressive. It is best to avoid holding the insect in the fist, as that almost guarantees a bite. They can fly, but they tend to avoid flying where possible. Most often they move "on foot" or jumps, which allow them to travel about in bushes and trees.
Tettigonia virdissima nymph on Phleum pratense
To request an improvement, please leave a comment on the page. Thank you!