Most spiders have some form of it, some like you said you can't miss and others are very slight to not at all. I own a couple forms and my bumblee bee does not have one that I"ve seen, my adult male spider does not have one either, my female spider has it when shes stressed or about to eat but its very slight. If you do a search on here you will find numerous topics on this to help you out in what info you are looking for and other peoples experiences.