Sea spiders
(class
Pycnogonida
) only superficially resemble true spiders. Fouror more pairs of jointed legs stretch froma small body (Fig. 7.39). A large pro-boscis with the mouth at the tip is usedto feed on soft invertebrates such as seaanemones and hydrozoans. Sea spidersare most common in cold waters, butthey occur throughout the oceans.