sea spider

noun
any member of the arthropod class Pycnogonida, marine invertebrates with eight long walking legs attached to a small body consisting of a cephalothorax and vestigial abdomen.

Origin:
1660–70

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World English Dictionary
sea spider
 
n
a small marine arachnid, having four pairs of legs and somewhat resembling a spider, unusual in that the male carries the eggs once they are laid and cares for the offspring

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica
Encyclopedia

sea spider

any of the spiderlike marine animals comprising the class Pycnogonida (also called Pantopoda) of the phylum Arthropoda. Sea spiders walk about on the ocean bottom on their slender legs or crawl among plants and animals; some may tread water.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Fluorescence of a sea spider and a small benthic amphipod.
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