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DescriptionEndeis spinosa has a small body up to 3 mm in length and legs 15 mm long. The proboscis is swollen at the tip, oval in cross-section, and is usually held at a 45 degree angle below the long axis of the body. The body is covered with a number of irregularly arranged spines, which are larger in males than females. The mouth section is circled by concentric rows of irregularly arranged spines. Endeis spinosa have neither chelifores nor palps, and the auxilary claws are notably shorter than the main claws. The eyes are a pale brown, slightly paler than in other pycnogonids. Only the males in this species have 7 segmented ovigerous legs.Although the food preferences have not been fully determined, it is thought that they feed on the detritus that gathers on the branches of various hydroids (King, 1974).