Wicksten: Key to hippolytid shrimp of eastern Pacific Ocean 595 



59 (47) Epipod only on first pereopod 60 



Epipods on first and second, or first to third pereopods 62 



60 Pterygostomian spine absent Heptacarpus littoralis Butler 



Baranof Island, Alaska to Seattle, Washington, 0-18 m (Butler 1980, Jensen and Armstrong 1987). 



Pterygostomian spine present 61 



61 Outer antennular flagellum extending beyond scaphocerite by about half length of former; lower 



limb of rostrum broader than upper Heptacarpus moseri (Rathbun) 



Bering Sea to Destruction Island, Washington; 0-1100 m (Butler 1980). 



Outer antennular flagellum barely extending beyond scaphocerite; lower limb of rostrum scarcely 



broader than upper Heptacarpus sitchensis (Brandt) 



Resurrection Bay, Alaska, to Yaquina Bay, Oregon, 0-12 m (Butler 1980). 



62 (59) Epipods on first and second pereopods 63 



Epipods on first to third pereopods 65 



63 Rostrum barely reaching end of first segment of antennular peduncle 



Heptacarpus pugettensis Jensen 



Seattle, Washington to near Morro Bay, California, intertidal (Jensen 1983, Wicksten 1988). 



Rostrum exceeding end of first segment of antennular peduncle, reaching to end of entire antennular 

 peduncle or beyond 64 



64 Rostrum usually reaching to end of scaphocerite but at least to base of antennular flagellum, 



ventral teeth of rostrum widely spaced Heptacarpus paludicola Holmes 



Tava Island, Alaska, to San Diego, California, 0-10 m (Butler 1980). 



Rostrum reaching end of or barely exceeding antennular peduncle, ventral teeth of rostrum crowded 



Heptacarpus pictus (Stimpson) 



San Francisco Bay, California, to off Thurloe Head, Baja California, 0-19 m (Wicksten 1988). 



65 (62) Dactyls of pereopods 3-5 simple and falcate, rostrum slightly ascending over eye and with 



dorsal teeth most thickly set in proximal half Heptacarpus stimpsoni Holthuis 



Sheep Bay, Alaska, to WSW of Punta Abreojos, Baja California, 0-73 m (Butler 1980, Wicksten 

 1988).'"' 



Dactyls of pereopods 3-5 bifid and with small spines on flexor margin, rostrum not slightly 

 ascending over eye and with dorsal teeth more widely spaced 66 



66 Rostrum not reaching as far as cornea of eye, with series of teeth angled downward from anter- 

 ior margin of carapace to tip Heptacarpus taylori (Stimpson) 



Queen Charlotte Sound, British Columbia, to Magdalena Bay, Baja California, 0-13 m (Green and 

 Butler 1988). 



Rostrum exceeding cornea of eye, rostral teeth more widely spaced and not as clearly angled 

 downwai'd 67 



67 Spine on distal ventral flexor margin of merus of first pereopod 



Heptacarpus fuse imacu lata s Wicksten 



Santa Rosa Island, California, to Guadalupe Island, Mexico, 0-295 m (Wicksten 1986, 1988). 



No spine on distal ventral flexor margin of merus of first pereopod 68 



