Key:  Family Hippolytidae (Broken-back Shrimp)

Phylum Arthropoda
 Subphylum Crustacea
   Class Malacostraca
     Subclass Eumalacostraca
      Superorder Eucarida
       Order Decapoda
         Suborder Pleocyemata
           Infraorder Caridea

Taken primarily from  Kozloff, 1987, 1996 p. 398 (Copyright 1987, 1996, University of Washington Press.  Used in this web page by permission of University of Washington Press)

Here are several related species, from off Kamchatka in the Sea of Okhotsk, NW Pacific:
  Lebbeus longidactylus
  Spirontocaris spina intermedia
 
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Lower taxonomic level Main Page Alphabetic Index Systematic Index Glossary

 
1a  Carpus of leg 2 consisting of 7 articles 2
1b Carpus of leg 2 consisting of 3 articles Hippolyte clarki
2a Supraorbital spines present 30
2b Supraorbital spines absent 3
3a Maxilliped 3 with an exopodite 21
3b Maxilliped 3 without an exopodite 4
4a Dactyls of legs 3-5 with bifid tips (photo) 6
4b Dactyls of legs 3-5 with simple tips 5
5a
5b
6a Rostrum short, not reaching beyond article 1 of antenna 1 7
6b Rostrum reaching to or beyond article 2 of antenna 1 9
7a Rostrum reaching to or beyond the cornea of the eye 8
7b Rostrum strongly downcurved, not reaching the cornea (This is a southern species which probably does not occur near Rosario) Heptacarpus taylori
8a Leg 3 with an epipodite; distal portion of article 1 of antenna 1 with 3-5 small dorsal spines Heptacarpus brevirostris
8b Leg 3 without an epipodite; distal portion of article 1 of antenna 1 with a single dorsal spine Heptacarpus pugettensis
9a Pterygostomian spine absent 10
9b Pterygostomian spine present (photo) 11
10a
10b
11a Pleuron of abdominal segment 4 with a ventral spine (photo) 12
11b Pleuron of abdominal segment 4 without a ventral spine 15
12a Leg 2 with an epipodite (but see notes at Heptacarpus sitchensis) 13
12b Leg 2 without an epipodite (but see notes at Heptacarpus sitchensis) 14
13a Length of the rostrum about equal to that of the rest of the carapace and reaching the end of the scale of antenna 2 (but see notes at Heptacarpus sitchensis) Heptacarpus paludicola
13b Length of the rostrum shorter than that of the rest of the carapace and not reaching the end of the scale of antenna 2 (but see notes at Heptacarpus sitchensis) Heptacarpus picta
14a Maxilliped 3 reaching beyond the scale of antenna 2 by about half the length of its distal article Heptacarpus moseri
14b Maxilliped 3, at most, barely reaching beyond the scale of antenna 2 (photo) Heptacarpus sitchensis
15a
15b
16a
16b
17a
17b
18a
18b
19a
19b
20a
20b
21a
21b
22a
22b
23a
23b
24a
24b
25a
25b
26a
26b
27a
27b
28a
28b
29a
29b
30a Maxilliped 3 with an exopodite; with 2 or more supraorbital spines 31
30b Maxilliped 3 without an exopodite; with only 1 supraorbital spine 39
31a Dorsal carapace spines with spiny anterior margins Spirontocaris prionota
31b Dorsal carapace spines without spiny anterior margins 32
32a Leg 3 without an epipodite 33
32b Leg 3 with an epipodite 35
33a Pleuron of abdominal segment 4 with a ventral spine Spirontocaris snyderi
33b Pleuron of abdominal segment 4 without a spine 34
34a
34b
35a Dactyls of legs 3-5 with bifid tips 36
35b Dactyls of legs 3-5 with simple tips Spirontocaris lamellicornis
36a Posteriormost carapace spine near the middle of the carapace 37
36b Posteriormost carapace spine on the posterior third of the carapace 38
37a
37b
38a Pleura of abdominal segments 1-3 with broadly rounded ventral margins Spirontocaris arcuata
38b Pleura of abdominal segments 1-3 with pointed ventral margins smaller specimens of 
Spirontocaris lamellicornis
39a Rostrum longer than the eye (projects past the eye) 40
39b Rostrum shorter than the eye Lebbeus sp.
40a Pleura of abdominal segments 2 and 3 terminating in sharp points Lebbeus groenlandicus
40b Pleura of abdominal segments 2 and 3 rounded 41
41a Leg 3 with an epipodite 42
41b Leg 3 without an epipodite (live specimens with purple, yellow, and red bands) Lebbeus grandimanus
42a
42b



Taxonomic Levels Represented in This Key:

  Heptacarpus brevirostris
  Heptacarpus sitchensis
  Lebbeus grandimanus
  Lebbeus groenlandicus
  Spirontocaris lamellicornis



Page created by Dave Cowles, 2005
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