1a |
With one or more tentacles and a manubrium
(unless the specimen is damaged); size variable, but mature specimens
generally
more than 2 mm high. |
2 |
1b |
With neither tentacles nor a manubrium;
sexually mature specimens (with a fully developed gonad along each of
the
4 radial
canals)
less than 2 mm high |
Orthopyxis spp. |
2a |
Tentacles originating at the margin of the bell |
3 |
2b |
Tentacles originating decidedly above the margin of the
bell |
62 |
3a |
With not more than 4 tentacles |
4 |
3b |
With more than 4 tentacles |
17 |
4a |
|
|
4b |
|
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5a |
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|
5b |
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6a |
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|
6b |
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7a |
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7b |
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8a |
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8b |
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9a |
|
|
9b |
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10a |
|
|
10b |
|
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11a |
|
|
11b |
|
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12a |
|
|
12b |
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13a |
|
|
13b |
|
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14a |
|
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14b |
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15a |
|
|
15b |
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16a |
|
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16b |
|
|
17a |
Tentacles (usually 9) branched once or twice, one
branch ending in
a sucker, the other 1 or 2 branches having swollen clusters of nematocysts
at the tip and elsewhere |
Cladonema californicum |
17b |
Tentacles not branched |
18 |
18a |
Radial
canals
branching, with all branches reaching the bell
margin |
19 |
18b |
Radial
canals
not branching (they may, however, have numerous lateral diverticula) |
21 |
19a |
|
|
19b |
|
|
20a |
|
|
20b |
|
|
21a |
With 4 or 8 radial
canals |
23 |
21b |
With numerous radial
canals |
22 |
22a |
Bell
up to 12 cm
wide; with up to 100 (or more) symmetrical radial canals; in mature
specimens
all radial canals reach the bell
margin; gonads extending along nearly the entire length of the radial
canals;
up to 150 tentacles in full-grown specimens, but the tentacles are not
all of the same size. (A common species) |
Aequorea
victoria |
22b |
Bell
up to 1.2 cm
wide; with fewer than 20 radial canals, these not symmetrically
arranged,
and some of them not reaching the bell
margin; small globular gonads attached to the radial canals near the
stomach;
with more than 100 tentacles, all the same size. (a rare species) |
Dipleurosoma typicum |
23a |
With 4 radial
canals |
28 |
23b |
With 8 radial
canals |
24 |
24a |
|
|
24b |
|
|
25a |
|
|
25b |
|
|
26a |
|
|
26b |
|
|
27a |
|
|
27b |
|
|
28a |
Tentacles evenly distributed around the bell
margin |
34 |
28b |
Most tentacles in clusters, although some single
tentacles may also
be present |
29 |
29a |
|
|
29b |
|
|
30a |
|
|
30b |
|
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31a |
|
|
31b |
|
|
32a |
|
|
32b |
|
|
33a |
|
|
33b |
|
|
34a |
Tentacles with prominent rings of nematocysts
along their entire length (photo) |
35 |
34b |
Tentacles without prominent rings of nematocysts
along their entire length |
37 |
35a |
Medusa
nearly
disk-shaped, not deeply convex; bell
of mature specimens not more than 6 mm in diameter |
45 |
35b |
Medusa
bell-shaped,
nearly hemispherical, bell
of mature specimens more than 1 cm in diameter |
36 |
36a |
Tentacles with an adhesive pad located some distance
proximal to the
tip (photo),
and characteristically
angled where the pad is located; without centripetal
canals; gonads orange, red, or brown |
Gonionemus
vertens |
36b |
Tentacles without an adhesive pad, but sometimes with a
filamentous
extension protruding at an angle from the tip; usually with numerous subumbrellar
centripetal
canals; gonads usually pale pink or brown |
Eperetmus typus |
37a |
Radial
canals
with conspicuous lateral diverticula whose length is at least twice the
diameter of the canals |
38 |
37b |
Radial
canals
without conspicuous lateral diverticula (if the margins of the canals
are
irregular, they do not form distinct diverticula whose length
appreciably
exceeds the diameter of the canals) |
40 |
38a |
Bell
higher than
its diameter, or height and diameter nearly equal; gonads fingerlike,
in
4 groups, attached to the radial
canals and hanging down into the subumbrellar
cavity |
Polyorchis
penicillatus |
38b |
Diameter of bell
much greater than the height; gonads closely associated with the radial
canals and their diverticula,
not hanging down into the subumbrellar
cavity |
39 |
39a |
|
|
39b |
|
|
40a |
Diameter of bell
distinctly greater than the height; gonads associated with the radial
canals |
41 |
40b |
Height of bell
greater
than the diameter, or height and diameter nearly equal; gonads
associated
with the stomach |
53 |
41a |
With ocelli
on
the tentacle
bulbs or on the marginal vesicles |
42 |
41b |
Without ocelli |
44 |
42a |
|
|
42b |
|
|
43a |
|
|
43b |
|
|
44a |
With tentacles all the same size in mature specimens |
45 |
44b |
With tentacles not all the same size in mature specimens |
52 |
45a |
|
|
45b |
|
|
46a |
|
|
46b |
|
|
47a |
|
|
47b |
|
|
48a |
|
|
48b |
|
|
49a |
|
|
49b |
|
|
50a |
|
|
50b |
|
|
51a |
|
|
51b |
|
|
52a |
With up to 64 large tentacles and 5-9 small tentacles
or cirri between
each two large tentacles; ring canal and gonads usually pale rose-pink;
exumbrellar
surface smooth and regular |
Mitrocomella polydiademata |
52b |
With up to 350 tentacles, long and short ones more or
less alternating;
colorless, or with the gonads and/or the exumbrella
pale blue; exumbrellar
surface irregularly creased |
Mitrocoma
cellularia |
53a |
With more than 50 marginal tentacles |
54 |
53b |
With fewer than 50 marginal tentacles |
55 |
54a |
With a large, bulbous apical projection that is
somewhat pinched off
from the rest of the bell;
with up to 150 marginal tentacles; each with a black ocellus
and some red or orange pigment on its bulb; bell more or less opaque |
Catablema multicirrata |
54b |
Apical projection low and rounded, not at all pinched
off from the
rest of the bell;
with
up to 100 or more marginal tentacles, these without ocelli;
manubrium
and tentacle
bases usually orangish, bell not opaque |
Neoturris
brevicornis |
55a |
|
|
55b |
|
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56a |
|
|
56b |
|
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57a |
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|
57b |
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58a |
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|
58b |
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59a |
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|
59b |
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60a |
|
|
60b |
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|
61a |
|
|
61b |
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|
62a |
|
|
62b |
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|
63a |
|
|
63b |
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|
64a |
|
|
64b |
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|
65a |
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|
65b |
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