"Arachnid" doesn't just mean spider. The 11 arachnid orders include scorpions, ticks, etc.; spiders are just 1 order of class Arachnida.
No, you don't identify spiders by "markings." Color patterns are variable within same species, similar between different species.
Are spiders insects? No, they're arachnids, as different from insects as birds are from fish!
Nearly all of the widespread assumptions and "general knowledge" about spiders is false!
Collector and photographer Bob Thomson’s affinity for spiders had a lasting impact on the Burke’s collections.
A chance encounter on a windy day leads to the discovery of a new spider habitat.
The strangest-looking arachnids found in Washington state according to Rod Crawford.