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For the United States & Canada
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Genus Zygoballus

Salticid - Zygoballus sexpunctatus - male Salticid - Zygoballus sexpunctatus - male Hammerjawed spider - Zygoballus rufipes - male Hammerjawed spider - Zygoballus rufipes - male Zygoballus rufipes - female Jumper - Zygoballus rufipes - female Zygoballus nervosus - female Zygoballus nervosus - female Species Zygoballus nervosus - Zygoballus nervosus - male
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Chelicerata (Chelicerates)
Class Arachnida (Arachnids)
Order Araneae (Spiders)
Infraorder Araneomorphae (True Spiders)
No Taxon (Entelegynes )
Family Salticidae (Jumping Spiders)
Genus Zygoballus
Three species are known from the United States and Canada. All three are represented on BugGuide.
Females: 3 – 6 mm; Males: 2.5 – 4.5 mm;
All Zygoballus specimens collected by the author (jb) have been found in short, broad-leaved vegetation less than 1ft. from the ground. Z. rufipes and nervosus are often sympatric, and have been taken from clearings within mature woods. I only know Z. sexpunctatus from old field, but other BugGuide records (Gloster Arboretum) imply similar wooded habitat for that species as well.
Adult males not common until late summer; longer-lived adult females can probably be found all year.
Internet References