Abstract: | One of the main criterion to create a key dichotomic, was the way to facilitating the identification and determination taxonomic of spiders present in Uruguay. Because of that the Uruguayan species have been relocated in other families, I carried out an upgrade of the taxa. So I present a key for the determination of 37 families of spiders. With the objective of simplifying the key, is separated directly in families following the characters of the infraorden Araneomorphae (Araneae), considering the number and the disposition of the eyes, the number and position of the tracheal espiracle, absence or presence of cribelum and calamistrum, anal tubercule, claws, labium, spinnerets, disposition of legs.
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