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16 juillet 2000 7 16 /07 /juillet /2000 09:50

 

Speckled wood (Pararge aegeria)



The Speckled wood (Pararge aegeria) is a diurnal butterfly (rhopalocère) pertaining to under order of Ditrysia, at the super family of Papilionoidea, the family of nymphalidés (Nymphalidae), the family of the satyrs (Satyrinae) and the Pararge kind.

There are several varieties of Speckled wood, such as for example Pararge aegeria tircis or Pararge aegeria aegeria, differentiation being due to variations of spots and colours.

The Speckled wood is a common butterfly in all Europe, except for extreme north. It is present in Russia to the Ural and even in part of Asia. One also finds the Speckled wood in many countries of the Mediterranean circumference (the Maghreb, the Middle East).

In France the Speckled wood is called tircis, in Germany: Waldbrett or Waldbrettspiel, in Spain: Maculada, in the Netherlands: Bont Zandoogje, in Denmark: Skovrandøjen, in Latvia: Margasis will satyras and in Finland: Täpläpapurikko.

The Speckled wood attends mainly the clear forests, the ways, the clearings, the raised urban parks, the hedges, the skirts of forest, the bushes where one can observe it, posed on a leaf, in the sun spots. In mountain, one can find it up to 1500 meters of altitude.

Generally the Speckled wood is bivoltine (two generations per annum), but it rather frequently arrives that there is a third generation. The imago is visible March, until October. When I say "the imago is visible from March to October", that means that one can see speckled wood during this period, but they result from different generations which follow one another.

The Speckled wood measurement approximately 38 to 45 millimetres and have antennas out of bludgeon. The female is slightly taller than the male. The top of the wings of the Speckled wood brown dark and is marked many cream-coloured or yellowish spots. Ocelle a pupillé black of white is present at the end of the former wings while the posterior wings have 3 ocelles pupillés blacks of white. The ocelles ones are located inside the cream-coloured or yellowish spots. The colors of the females are generally clearer than those of the males.

After fecundation, the female separately lays its eggs on the plants hosts, generally of graminaceous (poacées) like the agglomerated dactyl (Dactylis glomerata), the annual meadow grass (Poa annua), grass (Agropyron repens) or various cypéracées (cyperaceae). The blossoming is carried out at the end of about fifteen days.

The caterpillar is green/yellow and its back is traversed by a dark stripe while clearer stripes decorate the sides. The caterpillars of the first generation profit from a “normal” development and the nymphose generally begins 30 days after the blossoming and lasts itself approximately 30 days. With regard to the last generation of speckled wood, autumnal generation, the winter diapause is carried out either at the stage of caterpillar, or at the stage of chrysalis. The Speckled wood which passed the winter at the stage of chrysalis will appear earlier in spring.





Kriss de Niort, le 16 août 2007

 

 

 

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