Key:  Family Sergestidae

Taken primarily from  Kozloff, 1987, 1996 p. 393 (Copyright 1987, 1996, University of Washington Press.  Used in this web page by permission of University of Washington Press)

For an excellent, up to date, alternate key see Wicksten 2009 page 31
 

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1a	With a prominent spine on the dorsal part of the carapace just behind each eye [supraorbital spine], and with a similar spine on both sides of the carapace at a slightly more posterior level [hepatic spine] [The animal is also partly transparent and has a bioluminescent organ of pesta.  The tiny rostrum is acute.]	Eusergestes similis
1b	Without the spines described in couplet 1a [The animal is red and purple and not bioluminescent.  The tiny rostrum is blunt]	Sergia tenuiremis

  Eusergestes similis
  Sergia tenuiremis