Chelicerata
- Six photographs of sea spiders.
- http://www.marlin.ac.uk/gallery/index.php?spgmGal=Species/Chelicerata

Class Pycnogonida (Sea Spiders)
- Short introduction from the Animal Diversity Web.
- http://animaldiversity.ummz.umich.edu/site/accounts/information/Pycnogonida.html

Sea Spiders: Class Pycnogonida
- An introduction to the biology and ecology of Sea Spiders (Arthropoda: Pycnogonida).
- http://www.earthlife.net/chelicerata/pycnogonida.html

Introduction to the Pycnogonida
- Brief introduction to sea spiders, including information on their feeding and anatomy.
- http://www.ucmp.berkeley.edu/arthropoda/pycnogonida.html

Sea Slug Predators - Pycnogonids (Sea Spiders)
- Photo of a pycnogonid; information about Anoplodactylus evansi, a generalist predator of small opisthobranchs. From Sea Slug Forum.
- http://www.seaslugforum.net/factsheet.cfm?base=pycnogon

Pantopoda 1789-1995
- Extensive Pycnogonida (Pantopoda) bibliography compiled by Dr. Franz Krapp.
- http://franz.krapp.org/panto1.html