Spider Sex Sizes
Date: Winter 2011-2012
It is true that all female arachnids are larger than the males?
Generally, female arachnids are appreciably larger than their male counterparts (sexual dimorphism). Evolutionary biologists suspect that this makes males more mobile and able to search for widely dispersed females. Females, conversely, take a wait and see approach, tending to their webs. This is just one of many complementary strategies in the animal kingdom to ensure the continuation of the species.
Dr. Tim Durham
Instructor, Office of Curriculum and Instruction
Department of Biological Sciences
Florida Gulf Coast University
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Update: June 2012