background preloader

Insectes

Facebook Twitter

Haetera macleannania (pinned specimens) Butterfly - David G's Photography. Wild Horizons » Wild Costa Rica Editorial Gallery 2. Gorgeous Glasswing Butterflies (42 Stunning Photos) Not Photoshop, but transparent camouflage occurring in nature in a place other than in the sea.

Gorgeous Glasswing Butterflies (42 Stunning Photos)

While there are numerous gardens that successfully raise glasswings in captivity such as seen here in the glasshouse at RHS Wisley, when found in nature, the glasswing thrives in central-American, especially Costa-Rica, Panama, Ecuador, Venezuela. Photo #1 by Farrukh (Swamibu) The photographer wrote, “A transparent butterfly, shot in the Washington DC Smithsonian museum of natural history, in their live butterfly exhibit.” E.L.G. wrote, “Well-fed, the butterflies will last for at least 6 weeks, (and I suspect maybe as long as 12 weeks), and they don’t damage easily, despite their fragile appearance.” Photo #2 by Greg Foster Glasswinged or Glasswing butterfly, seen at Edinburgh’s Butterfly & Insect World, Scotland. The photographer noted, “The clear wings make this South-American butterfly hard to see in flight, a successful defense mechanism.” Glasswinged butterfly at the London Zoo. Search: Insect wing. Northwest Dragonflier. Comstock, 1893, Essay, Part II. Comstock (1893) Essay on EVOLUTION AND TAXONOMY, PART II.

Comstock, 1893, Essay, Part II

This essay is an outgrowth of an effort to determine the phylogeny of the families of the Lepidoptera, in order to decide upon a classification to be used in a general text book of Entomology. More than three years were devoted to the problem before a systematic method of procedure was adopted. This time was largely spent in a comparative study of published classifications and in an effort to determine which of these represented most accurately the facts of nature. A large part of the work yielded poor returns for the labor expended; for it was carried on with no definite plan; it was a blind groping in the dark. I regret that I have been unable to apply the method as fully as I should like to before publishing it. Philosophy. Wing Secrets That Help Insects Rule the World.

Andrea Perna. Understanding reticular patterns Leaf vein network Pattern on the wing of a dragonfly Fractures on the surface of ceramics Two-dimensional foam Many spatial patterns have a "reticular" or networklike form: leaf veins, lines of fracture in the glaze of ceramics, the pattern on the wings of dragonflies are just a few examples.

Andrea Perna

Scientists often produce theoretical models or computer simulations to understand how these different patterns are generated and grow over time. Topology of reticular patterns One possibility is to describe these patterns in terms of graphs. Unfortunately, the topology of these graphs does not give much information.

These and other constraints make it difficult to characterise reticular patterns only based on their topology. The importance of geometry The geometry of the lines that meet at junctions carries a lot of information on the characteristics of the pattern and its history of growth. Another common configuration involves orthogonal junctions of 180 and 90 degrees. Insect Flight: Early Fossil Record & Physiology. The insect wing is not just a membrane that juts of the insect’s body.

Insect Flight: Early Fossil Record & Physiology

It’s a complex of membranes, veins, folds and flexures – looking at it laterally, it is in no way a simple two-dimensional structure. Even more mind-boggling is the wing base, with all sorts of sclerites as muscle attachment sites, plates, vein sources and the notal margin. It is to the wing base that all the power generated by the thoracic muscles goes, so it is also imperative to the way an insect flies. Because I’ve received some complaints before about what exactly is meant by ‘wing venation pattern’, here’s a side-by-side example, using plecopteran wings. On the left side, you see the interpretation, on the right is the actual picture. About Drawwing. Insect wing. Original veins and wing posture of a dragonfly Hoverflies hovering to mate Cutout of a butterfly's wing with magnification Hardened forewings and hind wings unfolding in a beetle The physical dynamics of flight are composed of direct and indirect flight.

Insect wing

Those species that employ direct flight have wing muscles directly attached to the wing base, so that a small downward movement of the wing base lifts the wing itself upward. Morphology[edit] Internal[edit] Each of the wings consists of a thin membrane supported by a system of veins. Venation[edit] Venation of insect wings, based on the Comstock–Needham system In some very small insects, the venation may be greatly reduced.

The archedictyon is the name given to a hypothetical scheme of wing venation proposed for the very first winged insect. Natural History Museum Rotterdam - Pieridae - Show all families. Système Comstock-Needham. Un article de Wikipédia, l'encyclopédie libre.

Système Comstock-Needham

La terminologie des veines[modifier | modifier le code] Veines longitudinales[modifier | modifier le code] Fondation Airbus Group, mécène scientifique - Recherche-fondamentale - Projets-de-recherche - Securite - Objet-volant-mimant-l-insecte. Projet : OVMI - Objet volant mimant l'insecte Laboratoire : Institut d'Electronique de Microélectronique et de Nanotechnologies (IEMN) - UMR CNRS 8520 et Office national d'Etudes et Recherches Aérospatiales (ONERA) Thématique : Sécurité Durée : 2009/2012 Représentant du projet : Eric Cattan, Professeur de l'Université de Valenciennes.

Fondation Airbus Group, mécène scientifique - Recherche-fondamentale - Projets-de-recherche - Securite - Objet-volant-mimant-l-insecte

INSECTES5terter. Page 5terter Page précédente Page suivante Beaucoup d'Insectes sont "musiciens" : ils stridulent ("Chant" des Insectes).La stridulation correspond au frottement d'une partie de leur corps contre une autre :friction.

INSECTES5terter

Ces stridulations ont un rôle sexuel (favoriser la rencontre mâle et femelle) mais aussi pour éloigner un mâle éventuel ou effrayer un ennemi Le bruit émis de chaque insecte a un rythme, une fréquence et un timbre spécifiques Ce sont souvent les mâles qui "chantent" (Orthoptères...) mais ce peut être les 2 sexes La stridulation est la friction d'une râpe ou archet (alignement de stries,côtes,de dents,de petites épines...) sur le grattoir (saillie,bord vif...