Definition of Chaetognatha
: a phylum of small, slender marine animals comprising the arrow worms But the absence of a definite synapomorphy between Chaetognatha and any other metazoan taxon except Bilateria itself has cast the arrowworms into an enduring isolation. — Edward E. Ruppert et al., Invertebrate Zoology: A Functional Evolutionary Approach, 2004 — see also sagitta spadella
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Origin and Etymology of chaetognatha
New Latin, from chaet- + -gnatha
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