Key:  Family Pasiphaeidae

Taken primarily from  Kozloff, 1987, 1996 p. 396 (Copyright 1987, 1996, University of Washington Press.  Used in this web page by permission of University of Washington Press)

An excellent alternate, up to date key can be found in Wicksten 2009 page 44.
 

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1a	With a prominent lateral spine on both sides of the carapace at or close to the anterior end; without a distinct rostrum at the anterior end of the carapace, but with a large, anteriorly directed median spine close to the anterior end	2
1b	Without a prominent lateral spine on both sides of the carapace at or close to the anterior end; with a distinct rostrum projecting from the anterior end of the carapace	Parapasiphae sulcatifrons
2a	Lateral spines of the carapace slightly behind the anterior edge of the carapace; mostly transparent when alive, but generally spotted or tinged with red; length up to about 8 cm	Pasiphaea pacifica
2b	Lateral spines of the carapace at the anterior edge of the carapace; mostly crimson when alive; length up to about 21 cm	Pasiphaea tarda

 Parapasiphae sulcatifrons
 Pasiphaea pacifica
 Pasiphaea tarda