Spiders of the ecribellate haplogyne family Caponiidae are unusual in that most species have only two eyes which is unheard of in other spiders. Other species have four six or eight eyes. Even in a single species sometimes the number of eyes changes from spiderling to adult.
This page contains content from the copyrighted Wikipedia article "Caponiidae"; that content is used under the GNU Free Documentation License (GFDL). You may redistribute it, verbatim or modified, providing that you comply with the terms of the GFDL.