Glasswing forwards here. For the African glasswings, see Ornipholidotos. For the Australian glasswing, see Acraea andromacha. The (Greta oto) Glasswinged butterfly is a brush-footed butterfly, and is a member of the subfamily Danainae, tribe Ithomiini, subtribe Godyridina. (Greta oto) Glasswinged butterfly adults also exhibit a number of interesting behaviors, such as lengthy migrations and lekking among males.
The (Greta oto) Glasswinged butterfly
The wings are transparent, with a span of 5.6 to 6.1 cm (2.2 to 2.4 in). The butterfly's greatest common English name is glasswinged butterfly, and its Spanish name is mariposa de cristal, which means crystal butterfly. The skin between the veins of its wings looks like glass, as it lacks the colored scales establish in other butterflies. The opaque borders of its wings are dark brown, sometimes tinted with orange or red, and its body is dark in color.
Origin Of The Greta oto Wings' Transparency
The transparency of its wings results from the combination of 3 belongings: first, from the low absorption of the visible light by the material constituting its wings, second, from the small scattering of the light passing through the wings and finally, from the low reflection of the bright impinging on the wings surface.
The latter occurs for a broad range of incident wavelengths, covering the entire visible spectrum, and of incidence angles. This broadband and omnidirectional anti-reflection property originates from nano-pillars standing on the wing's surface which safeguards a gradient of refractive index between the incident medium (air) and the wing's tissue. Those nano-pillars, non-periodically arranged on the wing's surface, possess a high aspect ratio (height divided by radius) in surplus of 6, where the radii are below the wavelengths of the visible light. Besides, they feature a random width and height distribution, which is directly responsible for the smooth refractive index incline and thereby for the broadband and omnidirectional anti-reflection properties. These properties are further improved by the presence of pedestals at the improper of the nano-pillars.
Distribution About The (Greta oto) Glasswinged Butterfly
Adult glasswings can be found frequently from Central to South America as far south as Chile. They can migrate great distances and have been documented as far north as Mexico and Texas.
The (Greta oto) Glasswinged butterfly Feeding
(Greta oto) transparent butterfly visits common flowers like lantana, but prefers to lay its eggs on plants of the stifling Solanaceae genus Cestrum. The green caterpillars feed on these toxic plants and are perhaps toxic to predators through subordinate chemicals stored in their tissues; caterpillar chemical extracts are unpalatable to Paraponera clavata ants. Adults are also expected to be toxic, but their toxicity results mainly from males feeding on flowers (e.g., Asteraceae) whose nectar surrounds pyrrolizidine alkaloids. These same alkaloids also are converted into pheromones by the males and used to attract females.