Triangular Spiders – Arkyidae
These small spiders come in a variety of bizarre geometric, spiky or lumpy shapes, including triangles. Their front legs have long spines on the inside edge used to ambush prey. They don’t build webs, instead, they sit and wait for prey to venture within striking distance then rapidly lunge and grab it.
Example Australian species
Forked Triangular Spider – Arkys furcatus
Triangular Spider – Arkys lancearius
Walckenaer’s Triangular Spider – Arkys walckenaeri