Feather Star Crinoid
Feather stars are one of the quietest and most beautiful starfish (scientific family: crinoids). There are more than 1800 starfish species worldwide and they live in 6,000 meter (20,000 feet) deep shallower waters. Feather stars of all starfish families represent just over 500 species.
They are popularly called sea lilies and feathery stars, they have a solid calcite skeleton; they were so abundant in the Paleozoic seas that their remains formed large thicknesses of calcite.
What is crinoids stem?
Most crinoids are anchored to the bottom of the sea by a flexible stalk or peduncle, pentagonal or circular, made of numerous discoidal plates called columnales. There is a bulging cup or chalice in the upper part of the stem, to which the arms are attached, which was used to filter food from the water.
Normally, shortly after death, the whole skeleton decomposed into separate small plates called ossicles. By contrast, well-preserved crinoids are rare and beautiful fossils.
The peduncle of fixation of the crinoids is formed by the superposition of numerous artichokes or junctions, circular / cylindrical, starry or square shape and perforated in the center. These animals ‘ tissues are covered by a fine tissue and have interspersed discs that give peduncle elasticity. The peduncles are dis articulated when dying.
Sometimes the junctions are the same, but in other cases there are some bigger ones (nodes) than others that are narrower (intermodal).
Where do feather stars live?
If you want to know where the starfish live today, we’re telling you here. They live in all the world’s oceans. They’re living peacefully in tropical or cold environments. Living in the water is their watchword, because outside it they can’t tolerate a second. Usually they exist in the fresh water but Sometimes you can see them in brackish waters.
From the coastal areas, we can see them up to 6000 meters below the surface, deep in the sea.
In some parts of the world, they are called a plague because so many marine stars are agglomerated that they can be trapped in fishing nets to capture marine species, but for them these creatures are not their goal and they are discarded without consideration.
What does the feather star eat?
By moving water at room temperature, they feed on suspended particles. The feet or podium system captures suspended particles wrapped in mucous secretions and is transported through the groove to the mouth by ciliary tracts.
The diet includes a variety of protists (e.g. Diatoms and other unicellular algae, foraminiferous, actinopods), larvae of invertebrates, small crustaceans, and detritus.
Are feather stars dangerous?
We have never heard of feather star being dangerous. These creatures may come in a wide range of colors, including some bright yellows.There are about 625 different feather star species and its misconception that the feather stars are poisonous or dangerous.