Wicksten: Key to hippolytid shnmp of eastern Pacific Ocean 589 



Key to the Hippolytidae 



1 Lateral surface of carapace with many scattered spines. Carpus of second pereopods with 2 segments 

 Trachycaris restrictus (A. Milne-Edwards) 



Eastern Atlantic from Canary Islands to St. Helena Island, Bermudas, to Brazil, Gulf of California, 

 Panama; 0-100 m (Wicksten 1983). 



Lateral surface of carapace with at most three spines. Carpus of second pereopods with 3 or more 

 segments 2 



2 Carpus of second pereopods with 3 segments. (Often associated with sea grasses or brown algae) 

 3 



Carpus of second pereopods with 4 or more segments. (Size and associations various) 7 



3 Rostrum deep, lamellate. Anterior margin of carapace with 10 spines. No hepatic spine 



Latreutes antiborealis Holthuis 



Gulf of California to Chile, 4-46 m (Wicksten 1983).<" 



Rostrum elongate. Anterior margin of carapace with 2 spines. One hepatic spine 4 



4 First antennular segment without outer distal spines 5 



First antennular segment with one or more outer distal spines 6 



5 Tip of rostrum trifid. (Usually found among giant kelp, Macrocystis spp.) Hippolyte clarki Chace 



Sheep Bay, Alaska to Cedros Island, Baja California, 0-10 m (Wicksten 1983). 



Tip of rostrum bifid. (Usually found among sea grasses) Hippolyte zostericola (Smith) 



Massachusetts to Curacao, western Colombia, shallow subtidal (Wicksten 1989). 



6 First segment of antennular peduncle with one (rarely 2) spines, rostrum of female reaching nearly 



as far as tip of scaphocerite Hippolyte californiensis Holmes 



Sitka, Alaska to Baja California; rare in Gulf of California, 0-10 m, usually among eelgrass (Zostera 

 sp.) (Wicksten 1983). 



First segment of antennular peduncle with 3 spines, rostrum of female reaching about to distal 



1/3 of scaphocerite Hippolyte williamsi Schmitt 



Gulf of California to Chile, 0-10 m, among rocks and brown algae (Scirgassum sp.) (Wicksten 

 1983).(2) 



7 Carpus of second pereopod with 4 segments. Left second pereopod longer and stronger than right 

 Leontocaris pacificus Zarenkov 



Off Chile, 600-700 m (Zarenkov 1976). 



Carpus of second pereopod with 6 or more segments. Left and right second pereopods equal or 



nearly so 8 



8 Carpus of second pereopod with 6 segments. (Rostrum reaching at most to end of eye. Ranging 



from Gulf of California to Panama) 9 



Carpus of second pereopod with 7 or more segments. (Rostrum reaching end of eye or beyond, found 



north of Gulf of California to Chile) 11 



9 Supraorbital spine present. Finely striped, with large bluish-red eyespots on third abdominal tergite 



Thor spinosus Boone 



Indo-Pacific to Gulf of California, subtidal (Bruce 1976, Wicksten 1983). 



Supraorbital spine absent. Translucent, mottled or spotted, without eyespots 10 



