About Sickius longibulbi Soares & Camargo, 1948
This spider species is Sickius longibulbi, first described by Soares & Camargo in 1948. The most prominent characteristic of female Sickius longibulbi spiders is the complete absence of spermathecae. This trait is very rare among spiders, and it is not found in any known mygalomorphid spiders. Male Sickius longibulbi are distinguished by the shape of their embolus, which is long and bears a small hook at its tip.