Sunday 8 June 2003

Preadult Mayfly

Today I saw a strange insect resting on the kitchen window. It was colored in different shades of brown. Its wings were held straight out at the back and together, and it had amazingly long front legs. There browny blotches on its wings. I looked it up and discovered it was from the family Ephemeroptera, that is, it was a mayfly. On reading further I discovered it was a male and, from its appearance, had recently emerged from a nymphal case, and had not yet reached the final stage of its metamorphosis known as the sub-imago – it is a winged preadult life stage unique to the mayfly among all insect species. It usually rests among vegetation waiting for the final moulting stage to occur revealing the fully clothed mayfly or spinner as they are also known. Sadly, their life is very short: they will mate and if female lay eggs and in a just a few hours they will probably be dead.

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