The spitting spiders mechanism is similar as the Velvet worm has, but used by a completely different animal . Evolution at its best ?? i'd say rather the same designer using its inventions and amazing creativigy in different animals probably not......
The spider has many attributes thaat give evidence of a intelligent designer. Evolution cannot explain these features. The ability to spin silk and to weave their silk into patterns. Some spiders use their silk by a process called ballooning. Some spiders make trap doors to ambush their prey, while others lay trip wires as surveillance system. One referred to a the spitting spider can spit poisonous web and immobilize its prey . Spiders did not teach themself this behavior . these features show mindful thinking and planning.