Resembling or relating to echiuran worms; having characteristics similar to members of the phylum Echiura.
From 'Echiura' (phylum name) + '-oid' (resembling suffix), meaning 'like an echiuran worm.'
The echiuroid body plan—a simple sausage-shaped body with a proboscis—is evolutionarily ancient, making these worms living fossils that help scientists understand how complex animals first evolved from simple tube-like ancestors!
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