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Class Pycnogonida - Sea Spiders

Black bodiless spider Sea Spider - Pycnogonum stearnsi Callipallene brevirostris Callipallene brevirostris Pycnogonid Yachats Pycnogonid Yachats Pycnogonid Weird Water Bug
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.