Wicksten Key to hippolytid shrimp of eastern Pacific Ocean 591 



19 Rostrum more or less ovoid; posterior dorsal spine on carapace located near middle of carapace 



Spirontocaris ochotensis (Brandt) 



Bering Sea to Vancouver Island, Japan, coast of Siberia; 0-247 m (Butler 1980). 



Rostrum with lower limb broader than upper; posterior dorsal spine of carapace located on pos- 

 terior third of carapace Spirontocaris arcuata Rathbun 



Arctic to Sea of Japan and Strait of Juan de Fuca, 5-641 m (Butler 1980). 



20 (12) One supraorbital spine 21 



No supraorbital spine 36 



21 Epipods on only first pereopods 22 



Epipods on at least first and second pereopods 23 



22 Rostrum with 6-8 dorsal spines, stylocerite not reaching end of first segment of antennular 



peduncle Lebbeus vicinus vicinus (Rathbun) 



North of Unalaska, Aleutian Islands, 570-750 m (Rathbun 1904). 



Rostrum with 3-4 dorsal spines, stylocerite reaching end of first segment of antennular peduncle 

 Lebbeus vicinus montereyensis Wicksten and Mendez 



Monterey Bay to Gulf of California, 954-2824 m (Wicksten and Mendez 1982). 



23 Epipods on first and second pereopods 24 



Epipods on at least first to third pereopods 28 



24 Carapace with 4 large dorsal spines posterior to orbit. (Often associated with sea anemones) . . . 



Lebbeus grandimanus (Brazhnikov) 



Bering Sea to Sea of Japan and Puget Sound, Washington, 6-180 m (Butler 1980, Wicksten and 

 Mendez 1982). 



Carapace with 1-2 dorsal spines posterior to orbit. (Associations various or not known) 25 



25 Dactyl of third pereopod simple, without spines Lebbeus scrippsi Wicksten and Mendez 



Southern Peru to off Arica, Chile, 768-1164 m (Wicksten and Mendez 1982). 



Dactyl of third pereopod with spines 26 



26 First segment of antennular peduncle with 2 anteroexternal spines. Rostrum with 5-9 ventral 

 spines Lebbeus splendidus Wicksten and Mendez 



Off Lobos de Tierra, Peru, 712-1100 m (Wicksten and Mendez 1982). 



First segment of antennular peduncle with 1 anteroexternal spine. Rostrum with 4 or less ventral 



spines 27 



27 Rostrum overreaching antennular peduncle, with 3-4 ventral spines Lebbeus polaris (Sabine) 



Arctic to Sea of Okhotsk, Cape Cod and northern Europe, Aleutian Islands to Alice Arm, British 

 Columbia, 0-930 m (Green and Butler 1988). 



Rostrum barely reaching end to first segment of antennular peduncle, with 1-no ventral spines 



Lebbeus brandti (Brazhnikov) 



Japan and Sea of Okhotsk to Wilson Bay, Alaska, 10-172 m (Wicksten and Mendez 1982). 



28 (23) Epipods on first to fourth pereopods Lebbeus carinatus Zarenkov 



Off Peru and Chile, 1860 m (Zarenkov 1976). 



Epipods on first to third pereopods 29 



