The quiver spiders have very long legs and build irregular or sheet-like webs in dark places. They hang from the webs with their back downward. When the web is vibrated the spider quivers up and down (thus the name). The eggs are wrapped by a few strands of silk and carried by the female in her mouthparts. The tarsi have three claws. The anterior median eyes are small or lacking, and the other eyes are arranged in two groups of three. Tropical species, including Artema mauriciana and Smeringopus elongatus, occur in houses and greenhouses in Florida, and S. pallidus is a peridomestic pest in Brazil.

Long-bodied cellar spider, Pholcus phalangiodes (Fig. 18.7e)

Males are about 6 mm long and females are 7-9 mm long. The body is pale yellow, except for a gray mark in the center of the carapace. The abdomen is elongate, more than twice as long as wide, and twice as long as the cephalothorax. This is the most common cellar spider throughout continental USA, and it occurs in similar habitats in other regions of the world, including South America, Europe, and Japan.

Physocyclus globosus (Fig. 18.7d) Males are about 3.7 mm long and females about 4.7 mm long. The cephalothorax is dark yellow and the abdomen is dark gray. The abdomen is pale gray with dark spots on both sides of the midline. Legs are yellow with brownish-yellow rings at the distal ends of the femora and at both ends of the tibiae. This species occurs in houses in southern USA, from Florida to southern California. A closely related species, P. simoni, occurs in dry and warm house cellars and wine cellars. This species occurs in South America, the UK, and Europe.

Short-bodied cellar spider, Spermatophora meridionalis (Fig. 18.7g) Males are about 1.6 mm long and females are about 2 mm long. The body is pale yellow except for a pair of light gray spots on the carapace. Eyes are not elevated on a prominence. The abdomen is globose. This species occurs indoors in irregular webs in corners and on walls. It is distributed in eastern USA west to Missouri.

Spermatophora senculata Males and females are 2-3 mm long and the body is uniformly lightbrown. The cephalothorax, abdomen and legs are tan to light brown; eyes are brown and very distinct on the cephalothorax. This species occurs indoors in Japan.

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