Spider sexual dimorphism

Title Info
Common name Spider, Golden Silk
Scientific name Nephila clavipes
Taxonomic group Tetragnathidae
Source Dan L. Perlman
Ecosystems Forests
Forests Tropical rainforest
Ecological interactions Predation
Selection and adaptations Selection
Selection Morphology
Behavior Mating
Organisms Animals
Animals Arachnids
Date June 1990 - August 1990
Location La Selva Biological Reserve,Costa Rica,North America

Sexual dimorphism in Golden Silk Spiders, Costa Rica. This image shows two adult Golden Silk Spiders. The large one is the female and the small one above is a full-grown male. The female?s body can be an inch or an inch and a half (25-40mm) long, while the male is typically only about one quarter of an inch (6mm) long. The female invests vastly more resources in her gametes, the eggs, than the male invests in his sperm, creating two or more egg sacs that are at least one inch (almost 30mm) in diameter. The webs of these spiders can be a yard or two (1-2m) in diameter.