| Upogebiidae (mud shrimps) | 
	
		
	
	| 15 cm TL (male/unsexed); 10.5 cm TL (female) | 
| benthic; brackish; marine; depth range 0 - 1 m | 
	
	
	
		| Eastern Pacific:  Prince William Sound, Alaska to Morro Bay, California, USA. | 
	
		
	| Rostrum ending in three teeth, the median tooth broad and triangular, the lateral teeth much shorter.  A groove between the median and lateral teeth, also a very shallow median longitudinal groove.  Lower surface of rostrum without spines.  Anterolateral border of carapace with a very small tooth at the level of the eye.  First pereiopods subchelate.  Dactylus of adult male on inner surface with a longitudinal row of 6-12 tubercles, that are placed close together.  Carpus with some anterior spines.  Merus with a subdistal anterodorsal spine (Ref. 4). | 
	
	
		| It has lengths of 11 cm, total body length (Ref. 259); 15 cm (males) and 10.5 cm (females), total length (Refs. 4, 258). It burrows in muddy sand of the intertidal zone, sometimes under rocks; burrows are Y-shaped, and about 0.6 to 1 m deep (Ref. 4).  Found in bays and estuaries (Ref. 112892). | 
	
	
    | Not Evaluated (N.E.) Ref. 123251) | 
  
  
 		
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