Crossword clue: any of various small spiderlike marine arthropods having small thin bodies and long slender legs

The most common answer is pycnogonid (10 letters).

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

Possible answers

pycnogonid 10 letters wn-def

any of various small spiderlike marine arthropods having small thin bodies and long slender legs