Pycnogonids can be found in all marine habitats from the intertidal zone to the abyssal
depths. A number of species are also found in estuaries since many pycnogonids are
very tolerant of changes in salinity (B. Bain, unpublished data). In the intertidal zone,
the best places to look for pycnogonids are under rocks and in or on hydroids,
bryozoans, algae, and corals. In many cases, they are very hard to find since the
color of the pycnogonid often very closely matches its habitat (Bain, 1991).
Pycnogonids have also been collected from the tube feet of sea stars (Stock, 1981),
from brittle stars (Stock, 1979) and have been found clinging to nudibranchs (Merton,
1906; Ohshima, 1933b), holothurians (Ohshima, 1927b), polychaetes (Stock, 1959;
Salazar-Vallejo and Stock, 1987) and medusae (Lebour, 1916; Okuda, 1940.
Mauchline, 1984; Child and Harbison, 1986). They have also been found living in (and
feeding on) several different species of clams (Ohshima, 1927a, b; Ohshima, 1933a;
Ohshima, 1935; Benson and Chivers,.1960; Kikuchi, 1976; Ogawa and Matsuzaki,
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