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| cold-blooded aquatic vertebrates with gills, often have fins and elongated body covered with scales |
| phylum comprised of annelids |
scolex sco·lex (skō'lěks')
n. pl. sco·lex·es or sco·li·ces or sco·le·ces (-lĭ-sēz')
The knoblike anterior end of a tapeworm, having suckers or hooklike parts that in the adult stage serve as organs of attachment to the host.