Pelikanoidea — the assassin spider — uses mechanosensory silk-tracking to hunt exclusively other spiders. How unique is this level of prey specialization in Araneae?

Posting because I've been researching Pelikanoidea for a video project and I'm curious about the community's take on a specific question.

Assassin spiders are obligate spider-hunters — their entire morphology (elongated neck, modified chelicerae, specialized sensory systems) evolved specifically to detect, stalk, and kill other spiders. They follow silk draglines to locate prey and position themselves using their extended reach to strike from outside retaliation range.

The fossil record suggests this specialization is at least 165 million years old with minimal morphological change.

My question: outside of Pelikanoidea, are there other spider genera with this level of obligate intra-order predation? I know some Portia species hunt other spiders opportunistically but Pelikanoidea seems uniquely committed to the niche.

Also happy to share the video I made on this if the community is interested — covers the paleontology and hunting mechanics in detail.