| 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 |