A marine ribbon worm belonging to the class Anopla, characterized by the absence of an armed proboscis and simpler internal structure.
Combining 'anopla' (unarmed nemerteans) + 'nemertean' (from Nemertes, a figure in Greek mythology). This scientific term emerged in 19th-century marine zoology.
These worms are living fossils in a sense—their basic body plan is so successful that anoplonemerteans have barely changed over hundreds of millions of years, making them perfect subjects for studying how life adapts to stability.
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