Taken primarily from Kozloff,
1987, 1996 p.79 (Copyright 1987, 1996, University
of Washington Press. Used in this web page by permission of University
of Washington Press)
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| Lower taxonomic level | Main Page | Alphabetic Index | Systematic Index | Glossary |
| 1a | Body resembling a sac, without tentacles and not divided into a pair of large lobes at the oral end | 2 |
| 1b | Body solid, not saclike, either with a pair of conspicuous tentacles arising within sheaths on opposite sides of the body or with a pair of large lobes at the oral end (in which case there are small tentacles of 2 types in the cavity enclosed by the oral lobes) | 4 |
| 2a | ||
| 2b | ||
| 3a | ||
| 3b | ||
| 4a | Body with a pair of large lobes at the oral end; tentacles small, of two types (a pair of branched tentacles in sheaths near the mouth, and numerous small tentacles in tracts leading toward the mouth; both types are in the cavity enclosed by the oral lobes) | 5 |
| 4b | Body without a pair of large lobes at the oral end; tentacles conspicuous when extended, arising from sheaths on opposite sides of the body some distance from the mouth | 6 |
| 5a | Body surface smooth, colorless except for rows of darkly pigmented spots in line with the comb rows, but nearer to the mouth than these; length less than 12 (15) cm. | Bolinopsis infundibulum |
| 5b | Body surface covered with yellow-orange papillae; length sometimes more than 20 cm (rare; an undescribed species) | Leucothea sp |
| 6a | Tentacle sacs opening toward the aboral end of the body; tentacles with side branches (tentillae); mouth and pharynx relatively small | 7 |
| 6b | Tentacle sacs opening toward the oral end of the body; tentacles without side branches; mouth and pharynx relatively large | 10 |
| 7a | Tentacle sacs angling away from the pharynx toward the body surface for their entire length | 8 |
| 7b | Tentacle sacs lying close to the pharynx for most of their length | 9 |
| 8a | Body nearly spherical; tentillae fairly numerous and not coiled into neat, pear-shaped bundles when contracted | Pleurobrachia bachei |
| 8b | Body somewhat ovoid and flattened in the tentacular plane; tentillae sparse and coiled into neat pear-shaped bundles when contracted (an undescribed species) | Euplokamis dunlapae |
| 9a | Body elongate, approximately cucumber-shaped, the length sometimes attaining 10 cm; tentillae sparse (rare) | Hormiphora cucumis |
| 9b | Body ovoid, up to 2 cm long; tentillae numerous and crowded (tentacles red or pinkish purple, an undescribed species) | Mertensia sp |
| 10a | ||
| 10b |
Bolinopsis infundibulum
Hormiphora cucumis
Pleurobrachia bachei