Monarch butterfly wing, SEM

Numéro d’image : 12301158
Monarch butterfly wing, SEM
Coloured scanning electron micrograph (SEM) of Monarch butterfly wing with scales and scent gland (Danaus plexippus). Male monarch butterfly wings have narrower wing veins plus a spot of dense scales on each hind wing. The spot is a scent gland. Males use the pheromones produced by this gland to make themselves attractive to females. In two to five weeks of egg-laying a female will lay about 700 eggs. Generally, eggs hatch in 4 days, but cool temperatures delay hatching up to 12 days. Newly hatched caterpillars feed on milkweed, their sole source of food. Milkweed contains a poison that is harmless to monarchs, but which sickens predators. A caterpillar eventually attaches itself to a twig, sheds and forms a chrysalis from which an adult monarch butterfly emerges. An adult lives six weeks in summer but those that migrate can live six to nine months over winter. Magnification: x7 when shortest axis printed at 25 millimetres.
Licence : Droits gérés
Crédit: Science Photo Library / DENNIS KUNKEL MICROSCOPY
Taille de l’image : 2646 px × 3302 px
Model Release : Non requis
Property Release : Non requis
Restrictions : -

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