The Timefly, Musca temporamenthalis.
A fly that communicates the timefly infection, a condition that makes you realize 'time flies'.

This book shows a collection of timeflies. Figurative and abstract objects, jewels, made of silver, gold, iron, copper, old or antique materials, all kinds of stones, fossils, shells, silk, horsehair, wood, mammoth-ivory, feathers,...

Including the original description of the timefly.