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Tubularian
Hydroid (Tubularia crocea) - Most common hydroid.
Looks like a cluster of beautiful tiny flowers with short
tentacles. Can be difficult to identify from other hydroids
when flowers are not present. Flowers (hydranths) can be
red, pink, or white in color. Grows sub-tidally on hard
substrate to 5" high and colony sizes up to12"
wide.
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Zig-Zag
Wine Glass Hydroid (Obelia geniculanta) - Short
Hydroid grows to about 1" high and up to 12" wide.
Hydranth's (reproductive flowers) are conical and grow in
a zig-zag pattern up the 1" stem. Whitish color. Found
in shallow water on rocks, kelp and other algae.
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Stick
Hydroid (Eudendrium ramosum) - Medium height
hydroid grows to 6" high, with single small, tulip-shaped
flower at end of each stick. Can be difficult to identify
if flowers not present. Pink in color. Grows on solid substrate.
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Many-Armed
Hydromedusa (Laodicae undulata) - Flattened,
transparent saucer shape to 1 3/8" in diameter with
white ribbons not joining in the center. Resembles White
Cross Hydromedusa whose white ribbons connect in the center.
Found near the surface in coastal waters.
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Eight-Ribbed
Hydromedusa (Melicemtum octocostatum) - Bell
shaped to ¾ inch in diameter. Eight rows of canals
that are gold or white in color. Swims near the surface.
Found from spring to summer.
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Siphonaphore
(Stephanomia) - Colony of pelagic Hydrozoa. Each
section performs separate functions such as reproduction,
locomotion, flotation, or feeding. Floats close to shore.
Lengths up to 4'.
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