594 Fishery Bulletin 88(3), 1990 



49 Epipods present on first and second or first to third pereopods 50 



Epipods absent from all pereopods 52 



50 Epipods present on first to third pereopods Heptacarpus carinatus Holmes 



Dixon Harbor, Alaska, to Point Loma, California, 0-27 m (Butler 1980). 



Epipods present on first and second pereopods 51 



51 Posterior margin of third abdominal segment produced, forming rounded carina. Rostrum at least 



as long as carapace, with 5-8 ventral teeth Heptacarpus flexus Rathbun 



Bering Sea to Farallon Islands, California, 37-172 m (Schmitt 1921).*"" 



Posterior margin of third abdominal segment not produced. Rostrum shorter, not reaching end of 



scaphocerite, with 1 ventral tooth Heptacarpus herdmani (Walker) 



"Puget Sound" (Wicksten and Butler 1983). 



52 (49) Pterygostomian spine absent 53 



Pterygostomian spine present 55 



53 Rostrum shorter than carapace, distal ventral half convex .... Heptacarpus brachydactylus (Rathbun) 



Monterey Bay to off Santa Cruz Island, California, 486-763 m (Standing 1981). 



Rostrum longer than carapace, distal ventral half not convex or only slightly so 54 



54 Rostrum overreaching scaphocerite, without dorsal teeth on distal half 



Heptacarpus stylus (Stimpson) 



Chichagof Island, Alaska to Puget Sound, 0-439 m (Butler 1980). 



Rostrum barely exceeding scaphocerite, with dorsal teeth on distal half 



Heptacarpus franciscanus (Schmitt) 



San Francisco Bay, California, to Todos Santos Bay, Baja California, 5-14 m (Schmitt 1921, Carvacho 

 and Olson 1984)." 



55 (52) Rostrum with tiny lateral spinule on each side, located laterally near base 



Heptacarpus yaldwyni Wicksten 



Off Salina Cruz, Mexico, 1052-1145 m (Wicksten 1984). 



Rostrum without tiny lateral spinule on each side 56 



56 Scaphocerite shorter than carapace; sixth abdominal somite longer than telson 



Heptacarpus decorus (Rathbun) 



Gabriola Island, Strait of Georgia to San Diego, California, 22-313 m (Butler 1980). 



Scaphocerite as long as or longer than carapace; sixth abdominal somite shorter than telson 57 



57 Three spines on carapace and rostrum; none anterior to eye Heptacarpus tridens (Rathbun) 



Aleutian Islands to Cape Flattery, Washington, 0-110 m (Butler 1980). 



Five to six spines on carapace and rostrum, extending anterior to eye 58 



58 Dorsal posterior margin of third abdominal somite prominent; third maxilliped exteniling to middle 



of scaphocerite Heptacarpus camtschaticus (Stimp.son) 



Bering Sea to Tokyo Bay and Strait of Georj^a, 0-108 m (Butler 1980). 



Dorsal posterior margin of third abdominal somite flattened, third maxilliped extending almost to 



end of scaphocerite Heptacarpus kincaidi (Rathbun) 



East coast of Vancouver Island to San Pedro, California, 10-183 m (Butler 1980). 



