Unlikely been within a terrarium for a week and has not taken to behaviour typical of trap door spiders. For example wanders quite a large amount and interestingly enough spins small non adhesive webs in which it spends its downtime; however, these webs are not used as staging grounds for hunting for food. Attempted feeding multiple pinhead crickets both alive and with heads removed and it shows no interest in this food source. Most interesting behaviour is its tendecy to use the sponge as a place to build its web and hide underneath. Indicating a preference for damp places.
This is a purse-web spider, family Atypidae. It's unclear from the pictures to which genus or species it belongs, but I'm going to throw out a guess that it is a Sphodros species based solely on it being found in Kansas. The only other genus that occurs in the USA is Atypus to which the only species in the genus that occurs in the USA has only been found in PA. Not sure what you mean by "confirmed as not a member of Araneae" as the order Araneae includes all spiders, and this is most definitely a spider.
The family Atypidae construct burrows in the ground and build a silk tube that extends up a tree or other plant or horizontally along the leaf litter. They sit in these tube webs and when prey comes by they bite and grab it from inside the tube.
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