Pycnogonids (Phylum Arthropoda, Subphylum Chelicerata, Class Arachnida, Order
Pycnogonida) (Bain, in press) or sea spiders as they are commonly known, are marine
chelicerates ranging in size from less than 1 mm to over 50 cm in leg span. They are
quite common in many different marine habitats, especially the intertidal zone, but are
seldom seen because most of them tend to be small (less than 2.5 cm) and are often
cryptically colored. The larger and more conspicuous pycnogonids, especially
members of the genus Colossendeis, live in deeper waters worldwide and are
common near shore in the Antarctic.
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