| 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 |
|
|
| 8b |
|
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| 9a |
|
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| 9b |
|
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| 10a |
|
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| 10b |
|
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| 11a |
|
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| 11b |
|
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| 12a |
|
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| 12b |
|
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| 13a |
|
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| 13b |
|
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| 14a |
|
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| 14b |
|
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| 15a |
|
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| 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 |
|
|
| 31a |
|
|
| 31b |
|
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| 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 |
|
|
| 56a |
|
|
| 56b |
|
|
| 57a |
|
|
| 57b |
|
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| 58a |
|
|
| 58b |
|
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| 59a |
|
|
| 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 |
|
|
| 65a |
|
|
| 65b |
|
|