Insects
Antennae are the primary olfactory sensors of insects and are accordingly well-equipped with a wide variety of sensilla (singular: sensillum). Paired, mobile, and segmented, they are located between the eyes on the forehead. Embryologically, they represent the appendages of the second head segment.
All insects have antenna, however they may be greatly reduced in the larval forms. Amongst the non-insect classes of Hexapoda, Collembola and Diplura have antenna, but Protura do not.
Read more about this topic: Antenna (biology)
Famous quotes containing the word insects:
“There are men from whom nature or some peculiar destiny has removed the cover beneath which we hide our own madness. They are like thin-skinned insects whose visible play of muscles seem to make them deformed, though in fact, everything soon turns to its normal shape again.”
—E.T.A.W. (Ernst Theodor Amadeus Wilhelm)
“Our treasure lies in the beehive of our knowledge. We are perpetually on the way thither, being by nature winged insects and honey gatherers of the mind.”
—Friedrich Nietzsche (1844–1900)
“swerving
perfectly,
the fierce, brilliant faith
that pierces the heart all summer
and sips bitter insects steeped in nectar ...”
—Denise Levertov (b. 1923)