1) Animal order 2) Order pycnogonida 3) Sea spiders 
• (n. pl.) A class of marine arthropods in which the body is small and thin, and the eight legs usually very long; -- called also Pantopoda.
<zoology> A class of marine arthropods in which the body is small and thin, and the eight legs usually very long. ... Synonym: Pantopoda. ... The abdomen is rudimentary, and the triangular mouth is at the end of a tubular proboscis. Many of them live at great depths in the sea, and the largest of them measure two feet across the extended legs...
Pyc`no·gon'i·da noun plural [ New Latin , from Greek ... thick crowded + ... knee.] (Zoology) A class of marine arthropods in which the body is small and thin, and the eight legs usually very long; -- called also Pantopoda . » The abdomen is rudimentary, and the triangular mo...
[n] - sea spiders
order Pycnogonida noun sea spiders