Taken primarily from Kozloff,
1987, 1996 p. 421 (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 | Zooids separate from one another, not connected by stolons or united basally into a cluster; generally attached to other organsms | 2 |
| 1b | Zooids forming colonies, either connected by stolons or united basally into a cluster; freeliving or attached to other organisms | 4 |
| 2a | Base of stalk differentiated into a muscular disk by which the animal is attached (attachment is not permanent, however; the animal is capable of moving about to some extent) | Loxosoma davenporti |
| 2b | Base of stalk not differentiated into a muscular disk | 3 |
| 3a | With a horseshoe-shaped flange partly encircling the calyx, below the base of the ring of 8 tentacles (the flange is most prominent on the anal side, where the longest tentacles are located); attached to bryozoans | Loxosomella nordgaardi |
| 3b | Without a horseshoe-shaped flange below the base of the ring of tentacles; attached to hosts other than bryozoans | Loxosomella sp. |
| 4a | Producing buds at the base of the stalk, thereby forming a cluster of zooids that remain attached to one another; on the body surface of the polychaete Glycera nana (Glyceridae) | Loxokalypus socialis |
| 4b | Zooids connected by stolons; free-living or attached to other organisms, but not to polychaetes | 5 |
| 5a | Stalks thick, without muscular enlargements where they join the stolon | 6 |
| 5b | Stalks thin, with muscular enlargements where they jon the stolon (and sometimes with 1 or more muscular enlargements between the base and the calyx | 7 |
| 6a | Orientation of tentacles in a plane that is decidedly oblique to the long axis of the stalk; both stalk and calyx strongly muscularized, and with conspicuous cuticular spines | Myosoma spinosa |
| 6b | Tentacles oriented at right angles to the long axis of the stalk; neither stalk nor calyx strongly muscularized, and not bearing any spines | Pedicellina sp. |
| 7a | Stalks with 1 or more muscular enlargements (in addition to those at their bases) that enable them to bend sharply | 8 |
| 7b | Stalks without muscular enlargements (other than those at their bases) | Barentsia robusta |
| 8a | Stalks short (usually less than 2 mm) and delicate, lacking conspicuous cuticular pores | 9 |
| 8b | Stalks tall and robust, bearing conspicuous cuticular pores | 10 |
| 9a | Stalks with several muscular enlargements, thus with a beaded appearance | Barentsia benedeni |
| 9b | Stalks with only 1 or 2 muscular enlargements | Barentsia parva |
| 10a | Stalks generally with 4-6 muscular enlargements, from many of which erect branches arise, making the colonies very bushy | Barentsia ramosa |
| 10b | Stalks generally with 2-4 muscular enlargements, without branches, the colonies therefore not bushy | Barentsia gracilis var. nodosa |
Barentsia robusta
Loxosomella sp.