| 1a |
Segments 2 and 3 with anteriorly directed, thin dermal collars,
and more posterior segments (beginning with about segment 17) with posteriorly
directed collars |
Rhodine bitorquata |
| 1b |
None of the segments with thin dermal collars |
2 |
| 2a |
Prostomium with
a cephalic plate, this with a conspicuous rim that often appears leathery
(photo) |
3 |
| 2b |
Prostomium without
a cephalic plate (it may, however, have a flattened area) |
22 |
| 3a |
Anus dorsal to the terminal portion (which is often platelike) of the
pygidium;
setiger
1 without neurosetae |
4 |
| 3b |
Anus central, either terminal or within a funnel-like modification
of the pygidium; setiger
1 usually with neurosetae |
9 |
| 4a |
|
|
| 4b |
|
|
| 5a |
|
Chirimia similis |
| 5b |
|
|
| 6a |
|
Metasychis disparidenta |
| 6b |
|
|
| 7a |
|
|
| 7b |
|
Chirimia biceps |
| 8a |
|
|
| 8b |
|
|
| 9a |
Neuropodia of
first 3 or 4 setigers
with only a few (usually 1-3) setae,
these generally spines or modified uncini;
pygidium
with or without a funnel |
10 |
| 9b |
Neuropodia of
first 2 or 3 setigers
with several to many uncini
(in Maldanella, however, the first setiger
does not have a neuropodium); pygidium
with a funnel |
19 |
| 10a |
Setiger 8 with a
triangular glandular area on the ventral side; pygidial
funnel short or indistinct |
Clymenura columbiana |
| 10b |
Setiger 8 without
a glandular area on the ventral side; with or without a pygidial
funnel |
11 |
| 11a |
Pygidium with a
funnel |
15 |
| 11b |
Pygidium without
a funnel |
12 |
| 12a |
|
|
| 12b |
|
|
| 13a |
|
|
| 13b |
|
|
| 14a |
|
|
| 14b |
|
|
| 15a |
Setiger 5 and succeeding
setigers
with obvious glandular rings (these are often lighter than the other portions
of these
setigers);
first neuropodia
with a single straight spine |
Isocirrus longiceps |
| 15b |
Setiger 5 and succeeding
setigers
with glandular rings, but these are not conspicuous; first neuropodia
with spines or with uncini
that are so much modified that their hooklike form is scarcely apparent |
16 |
| 16a |
Cirri of pygidial
funnel longest midventrally; with fewer than 25 setigers |
17 |
| 16b |
Cirri of pygidial
funnel all about the same length, and lacking in the midventral region;
with more than 31 setigers |
Macroclymene sp. |
| 17a |
Setiger 1 fused
to the prostomial-peristomial
complex; epidermis with a networklike pattern |
Euclymene reticulata |
| 17b |
Setiger 1 distinctly
separate from the prostomial-peristomial
complex; epidermis smooth or ringed |
18 |
| 18a |
Lateral notches in rim of cephalic plate distinct; setiger
1 with spines, setigers
2 and 3 with modified uncini
(the bent tips of these are toothed); cirri of pygidial
funnel of unequal length, the longer ones alternating with the shorter
ones.
This species is close to E. zonalis,
and is perhaps within the range of variation of the latter; see choice
18b. |
Euclymene sp. |
| 18b |
Lateral notches in rim of cephalic plate indistinct or lacking; setigers
1-3 with spines or with modified uncini;
cirri of pygidial funnel
all of about equal length |
Euclymeme zonalis |
| 19a |
Setiger 1 without neurosetae |
20 |
| 19b |
Setager 1 with 5 or more neurosetae |
21 |
| 20a |
|
|
| 20b |
|
|
| 21a |
Anterior edge of setiger 4 with a membranous collar; cirri of pygidial
funnel all about the same length |
Clymenella torquata |
| 21b |
Anterior edge of setiger 4 without a membranous collar; cirri of pygidial
funnel of uneven length; those of the midventral part usually longer than
the others (common intertidally in muddy sand) |
Axiothella rubrocincta |
| 22a |
|
|
| 22b |
|
|
| 23a |
|
|
| 23b |
|
|
| 24a |
|
|
| 24b |
|
|
| 25a |
|
|
| 25b |
|
|
| 26a |
|
|
| 26b |
|
|