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Class Pycnogonida - Sea Spiders

Black bodiless spider Callipallene brevirostris Callipallene brevirostris Yachats Pycnogonid Pantopoda Anoplodactylus californicus?  - male Anoplodactylus californicus?  - male Anoplodactylus californicus?  - male
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Chelicerata (Chelicerates)
Class Pycnogonida (Sea Spiders)
Explanation of Names
Pycnogonida Latreille 1810
Numbers
A single extant order, with ~1120 spp. in ~80 genera of 11 families worldwide(1)
A study from 1950 counted 8 families, 17 genera, and 45 species in the western North Atlantic from Labrador to the Bahamas. However, only 7 families, 10 genera, and 14 species were recorded on the surface.(2)
Internet References
General information from Wikipedia
Works Cited
1.Class Pycnogonida Latreille, 1810. In: Zhang Z.-Q. (ed.) Animal biodiversity: An outline of higher-level classification...
Bamber R. 2011. Zootaxa 3148: 110–111.
2.The Pycnogonida of the Western North Atlantic and the Caribbean
Hedgpeth J. 1950. Proceedings of the United States National Museum 97(3216): 157-342.