A taxonomic classification (now obsolete) for a group of invertebrate marine animals lacking distinct head segments.
From Greek 'enchelis' (eel-like) plus 'kephalē' (head). This was a 19th-century scientific classification that modern taxonomy has abandoned.
Early taxonomy tried to categorize ocean creatures with minimal equipment—names like 'enchelycephali' were educated guesses based on appearance, many later proven completely wrong when microscopy advanced.
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