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Insects and other arthropods

Yellow sac spider

Cheiracanthium mildei

Tabs group


These small spiders are 7 to 10 mm long. Their body is pale, greenish, tan or whitish yellow. The abdomen is slightly translucent and may change colour depending on what the spider has eaten. It ends with conical, rather than cylindrical, spinnerets.

Their front legs are longer than the others, and all eight legs end in a small pair of claws. On the head, there are two horizontal rows of four similarly sized eyes. The palps and chelicerae are brown.

Life cycle

After mating, the fertilized females find a protected spot like a folded leaf, where they lay about fifty eggs. They cover the eggs with white silk for additional protection from predators.

When they live indoors, the adults of this species can be encountered year-round.

Geographic distribution

The species is found throughout the Northern Hemisphere (it is holarctic), and in Argentina.

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