Crevice weaver
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Crevice weaver spiders (Filistatidae) comprise cribellate spiders with features that have been regarded as "primitive" for araneomorph spiders. They are weavers of funnel or tube webs. The family contains 18 genera and more than 120 described species worldwide.
Image: Kukulcania hibernalis male
Image: Filistatid web (Marshal Hedin)
Kukulcania hibernalis male
Cribellum
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Cribellum literally means "little sieve", and in biology the term generally applies to anatomical structures in the form of tiny perforated plates.
Progradungula otwayensis (Gradungulidae) holding a snare made from silk spun from its cribellum