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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 (Entelegynae)
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