What is an order of free-swimming marine worms, of which the genus Sagitta is the type. They have groups of curved spines on each side of the head called?
chaetognatha — An order of free-swimming marine worms, of which the genus Sagitta is the type. They have groups of curved spines on each side of the head. (Webster's 1913.)
Sources
- Webster's Unabridged Dictionary, 1913 edition (public domain, via GCIDE / Project Gutenberg).
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