 | This article includes a list of general references, but it lacks sufficient corresponding inline citations. (April 2019) |
| Caponiidae Temporal range:
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|---|---|
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| Left: Nops guanabacoae Middle and right: Cubanops alayoni female and male | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Subphylum: | Chelicerata |
| Class: | Arachnida |
| Order: | Araneae |
| Infraorder: | Araneomorphae |
| Family: | Caponiidae Simon, 1890 |
| Diversity | |
| 19 genera, 124 species | |
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Caponiidae is a family of ecribellate haplogyne spiders that are unusual in a number of ways. They differ from other spiders in lacking book lungs and having the posterior median spinnerets anteriorly displaced to form a transverse row with the anterior lateral spinnerets. Most species have only two eyes, which is also unusual among spiders. A few species of Caponiidae variously have four, six or eight eyes. In some species the number of eyes will increase when the spiderling changes its skin as it grows towards adulthood.