Generally a combination of these features: tough exoskeletion made of chitin, jointed appendages and segmented bodies.
There is no single feature as any of these features are not exclusive to Arthropoda e.g. Annelida also have segmented bodies.
Just like butterflies, fleas, bees and ants, wasps are insects and thus feature in the Class Insecta. All insects, along with arachnids (spiders, ticks and so on) and myriapods feature in the Phylum Arthropoda.
The most important feature used to classify animals is Body structure!
the most important feature in communication is the body especially eye contact and facial expressions
It's called The Most Geographical Feature of Jamaica.
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The brakes.
The government
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The Andes Mountains
organization
Lobsters are belong to the Phylum of Arthropoda.
The most important feature is the ability to block out the light from the outside. Without this there is really no use to having them hung up in the first place.