Araneomorphae

Araneomorphae is the largest infraorder of spiders. Its members generally have fangs that oppose each other sideways, unlike the downward-opposing fangs of mygalomorph spiders.

Spider: An arachnid with two main body regions, four pairs of legs, and silk-producing organs called spinnerets. Araneomorphae is one of the two major infraorders within spiders.
Spider cheliceral fang movement: The range and direction of movement of a spider's fang-bearing chelicerae during prey capture and biting. Araneomorph chelicerae generally bring opposing fangs together in a pinching action.
Spider evolution: The evolutionary history of spiders, from their early arachnid ancestors to living lineages. Araneomorphae represents a major branch in the diversification of spiders.
Black widow spider: A venomous spider in the genus Latrodectus, recognized by distinctive markings in many species. Black widows are medically notable araneomorphs whose bites can cause latrodectism.
Salticidae: The spider family commonly called jumping spiders, noted for excellent vision and active hunting. This large araneomorph family shows how prey capture can rely on vision rather than a capture web.
Chelicera: A paired appendage near an arachnid's mouth, modified in spiders into a fang-bearing structure. The orientation of araneomorph chelicerae and fangs defines their characteristic bite mechanism.
Spider venom: A mixture of biologically active substances produced by many spiders and delivered through their fangs. Many araneomorphs use venom injected through the fangs to subdue prey.
Spider phylogeny: The hypothesized evolutionary relationships among spider species and higher taxonomic groups. Phylogenetic evidence establishes Araneomorphae's membership and internal relationships.
Brown recluse spider: A venomous North American spider in the genus Loxosceles, associated with occasional necrotic bites. Brown recluse spiders illustrate the limited but significant medical impact of some araneomorphs.
Araneidae: A spider family that includes many familiar orb-weaving spiders. Its web-building members demonstrate one prominent araneomorph hunting strategy.

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