单词	Chaetognatha
释义	Chaetognatha plural noun Chae·​tog·​na·​tha kēˈtägnəthə : 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 chaetognathan -thən adjective chaetognathous -thəs adjective Word History Etymology New Latin, from chaet- + -gnatha
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