Until recently, insects and arachnids have not been considered for inclusion on threatened and endangered species lists.
The species is extremely vulnerable to desiccation, causing it to shelter in damp shady areas such as shaded moss.
The spider builds a tube shaped web between the moss and a rock or fir tree,[2] hence the name.
This species is listed as endangered due to habitat loss, as well as non-native spider introduction.
A vulnerable species is one listed by the International Union for Conservation of Nature as likely to become endangered unless the circumstances threatening its survival and reproduction improve.
The information on the great raft spider is very recent and due to a lack of historical records, the level of decline cannot be accurately measured.