Sea spiders can range in size

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.

Some species live on hydroids

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