While collecting proverbs and quotes on insects and spiders, occasionally I found some relating to other arthropods, such as scorpions and millipedes. For insects and spiders there are separate lists of proverbs and quotes.

Scorpion in Thailand
Scorpion in Thailand

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A centipede though dead will not fall.

A tick.
An unpleasant or worthless person

Because we focused on the snake, we missed the scorpion.

Don't turn over the rubbish to look for a centipede.

Even the hand of compassion is stung when it strokes a scorpion.

God did not give wings to scorpions.

He who has been stung by a scorpion is afraid of its shadow.

I'm full as a tick on a fat dog.
Expression used in the US south after a full meal of chicken, fried steak, BBQ or whatever.

Relations are scorpions.

The camel carries the load, but it is the tick that complains.

The scorpion is sister to the snake.

There are, however, some winged creatures that walk on all fours that you may eat: those that have jointed legs for hopping on the ground.
Source: Leviticus 11

Though the centipede has one of its legs broken, this does not affect its movement.

Ticks, bedbugs and a crying child are insupportable.

Two scorpions in a small cave are better than two sisters in the house.

Two scorpions living in the same hole will get along better than two sisters in the same house.

Under every stone sleeps a scorpion.

We keep an eye on the scorpion and the serpent, but we do not watch out for the millipede.

You are like a tick in a dog's ear.

You are like the centipede, which walked perfectly until it tried to explain which leg went after which.
Dorothy L. Sayers
Source: Thrones, Dominations

Related keywords

insects spiders animals flies