Key:  Phylum Chaetognatha

Taken primarily from  Kozloff, 1987, 1996 p. 478 (Copyright 1987, 1996, University of Washington Press.  Used in this web page by permission of University of Washington Press)

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1a	With 2 completely separate lateral fins on both sides of the body	2
1b	With a long single fin or 2 incompletely separate fins on both sides of the body	3
2a	Anterior lateral fins slightly longer than the posterior lateral fins, and reaching nearly to the level of the posterior edge of the ventralganglion	Sagitta decipiens
2b	Anterior lateral fins slightly shorter than the posterior lateral fins, and terminating at a distance equal to more than half their length behind the posterior edge of the ventralganglion	Sagitta elegans
3a	With 2 incompletely separate lateral fins on both sides of the body; anus anterior to the tail septum; without oil droplets in the tissue	Sagitta scrippsae
3b	With a single long lateral fin on both sides of the body; anus at the tail septum; with conspicuous oil droplets in the intestine	Eukhronia hamata

  Eukhronia hamata

Salish Sea Invertebrates web site provided courtesy of Walla Walla University