Key:  Infraorder Thalassinidea

Taken primarily from  Kozloff, 1987, 1996 p. 402 (Copyright 1987, 1996, University of Washington Press.  Used in this web page by permission of University of Washington Press)

An excellent alternate, more comprehensive key can be found in Wicksten, 2009 page 184.
 

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1a	Rostrum conspicuous, at least twice as long as wide, with 5 or 6 teeth on each side	Family Axiidae
1b	Rostrum either a small tooth or a broad process that is divided into 3 teeth	2
2a	Rostrum a small tooth, not hairy (photo), chelipedschelate and decidedly unequal (in mature or nearly mature specimens)	Family Callianassidae
2b	Rostrum a broad process divided into 3 teeth and hairy dorsally; chelipedssubchelate (the dactyl bends back to close against the propodus itself, rather than against a clawlike process of the latter) and nearly equal	Family Upogebiidae, Upogebia pugettensis

  Family Callianassidae
  Upogebia pugettensis