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 | 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 | 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 | ||
| 9b | ||
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| 10b | ||
| 11a | ||
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| 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 | ||
| 35b | ||
| 36a | ||
| 36b | ||
| 37a | ||
| 37b | ||
| 38a | ||
| 38b | ||
| 39a | Rostrum longer than 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 |
Heptacarpus brevirostris
Lebbeus grandimanus
Lebbeus groenlandicus