Generally, ground spiders are characterized by
having barrel-shaped anterior spinnerets that are one
spinneret diameter apart. The main exception to this
rule is found in the ant-mimicking genus Micaria.
Another characteristic is an indentation in the endites
(paired mouthparts anterior and lateral to the labium,
or lip). All ground spiders lack a prey-capture web and
generally run prey down on the surface. They hunt at
night and spend the day in a silken retreat. The
thick-walled egg sacs are guarded by the mother until
the spiderlings hatch.
At present, no ground spiders are known to be
seriously venomous to humans. Very few people even
notice them.
Information: Wikipedia
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