lunes, 15 de enero de 2007

Saltamontes de campo común

Saltamontes de campo común (Chorthippus brunneus)
Datos de la foto: Camara Kodak DX6490 con Raynox DCR250, Flash difusor casero. F8 a 1/250. Campo de Tarragona, final de tarde.

Phylum: Arthropoda
Subphylum: Mandibulata
Clase: Insecta
Subclase: Paurometabola
Orden: Orthoptera
Suborden: Caelifera
Superfamilia: Acridoidea
Familia: Acrididae
Subfamilia: Gomphocerinae

Es un saltamontes de casi dos centímetros de longitud y muy vigoroso. Tiene los órganos del oído situados en los laterales del segmento anterior del abdomen.
Habita en Europa, de manera frecuente, sobre prados secos, linderos, confines de bosques, y sobre superificies cultivadas.
Los saltamontes reales tienen antenas cortas. Los “saltamontes” cuyas antenas son tan largas o más que su propio cuerpo son en realidad grillos de matorral o saltamontes de antenas largas (también conocidos como katydids).

This is probably the most frequently seen grasshopper;
CHorthippus brunneus is usually pale brown in colour, though it can be partly or entirely green. Attention to detailed characters is required for certain identification.
The top plate of the thorax is the pronotum, which has conspicuous white keels that are sharply angled inwards, providing immediate separation from brown forms of the usually green Chortohippus parallelus. There is a noticable pale margin to the posterior edge of the pronotum, enclosing the black region when this is present.
Myrmeleotettix maculatus is a similar but smaller species with much the same range of colouring and rather similar in its pronotal markings, but the antennae of M. maculatus are slightly thickened at the tips, especially so in the male. Gomphocerippus rufus is a scarce, very southern species that might also be taken for C. brunneus but which again differs in its distinctly clubbed, white-tipped antennae.
Like other members of the order Orthoptera it has:
•long, powerful hind legs enabling it to jump.
•‘leathery’, straight-veined fore-wings that protect the delicate, membranous hind-wings.
•powerful, biting mouthparts.
•ability to ’stridulate’ – the action of rubbing two body parts together to produce sound. In the case of the grasshopers (family Acrididae, grasshoppers and locusts), this is done by rubbing the hind legs against the toughened veins of the fore-wings, the inner side of the femur (upper leg) in most species (in the male) having small, peg-like projections for this purpose. The result is a ‘chirping’ song characteristic for each species. In general, in the grasshoppers, stridulation is done by the male, to attract receptive females, which might reply more quietly.

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