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Heteractis magnifica have
made many adaptations to better prepare itself for survival. It is
an invertebrate and can be found in various sizes and colors, and has a
great defense system. |
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Large Anemone in
Aquarium
Picture by Elizabeth Guck |
The Ritteri Anemone
has been found in many different shapes. It is second largest in
potential size for symbiotic anemones, after Stichodactyla mertinsii.
In the wild, this anemone can reach 3 feet in diameter. When in an
aquaria, it tends not to grow past a 1.5 foot diameter, which is still
quite large. It is usually tannish in color, with variations of
red, pink, purple, orange, blue, and green. |
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Sea anemones are made
up of a small sac. On one end, they have an adhesive foot, called
a pedal disc. This can be used to attach itself to various
surfaces. On the other end, it has one opening, called an oral
disc, where it feeds and produces waste. This anemone can also
retract itself almost completely into its base, showing little to no
tentacles. Even though anemones are anchored to one spot, this
does not mean they are 100% immobile. Anemones can release
themselves and "swim" to a new location mostly using flexing motions. |
Oral Disc of Anemone
Picture by Elizabeth Guck |
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Stings from Anemone
Picture by Gail Soderberg and Andy Guck |
Surrounding the oral disc are many
stinging tentacles. These tentacles are used for capturing food
and transferring it to its mouth. They can also be used for
defensive purposes. Heteractis magnifica have long
tentacles, which are non-tapering and may even look like they have a
swollen tip. On the tip of these tentacles are cnidocytes, which
contain nematocysts. The nematocyst contains a small cell filled
with toxins. When something brushes up on a sensory hair connected
to this cell it will cause a cell explosion. During this cell
explosion, it will fire a harpoon-like mechanism that will inject toxins
into the other organism. This is what feels sticky when an anemone
is touched. These toxins then paralyze the organism, and the
anemone is able to bring it to its mouth to be digested.
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