What is the key physical difference in leg count between a pond skater and a spider?

Answer

Pond skaters have 6 legs, while spiders have 8 legs

The most reliable immediate marker for distinguishing these creatures is the leg count: pond skaters possess six legs, adhering to the insect blueprint, whereas spiders possess eight legs.

What is the key physical difference in leg count between a pond skater and a spider?
spiderinsectclassificationarachnidpond skater