A Short Note on Sea Lilies
Sea Lilies resemble a plant more than animal. Sea lilies are some of the most attractive but less known animals than deep oceans. Sea lilies are members of the Crinoidea class (Phylum Echinodermata), a class that includes feather stars. The lilies are also linked to early echinoderms, as sea urchins, starfish and marine cucumbers. However, unlike these small forms and sessions, however, the main body of a Sea lily is composed of an extended and thin stem that is generally anchored by a simple arrangement of arms in the form of a root. The main body, which has a connected appearance, can reach up to 27.5 inch (70 cm) in length, but most of the living species is much smaller. Some fossil species have been discovered with a stem up to 82 feet or 25 m, long. Some marine lilies have a branched structure, while others are simple and straight in design. Marine lilies vary considerably color, but most are delicate tones of yellow, pink or red.
The main part of the body, the calyx, is performed at the top of the stem, rather like a crown. This contains the main bodies of the body and develops even more with a series of 510 feather arms. The number of weapons seems to vary with water temperature: some of the larger and tropical species can have up to 200 arms. Each arm is further adorned with a large number of delicate pinnals that, when extending, increase the area available to capture food. When the animal is not feeding, or if the arms are in danger of being eaten by a predatory fish or crustacean then the arms may be gets folded and the entire crown will be withdrawn. The mouth is on the central disc at the base of these arms. The arms and pinnules together trap refined food particles from swirling water currents. Small furrows on the surface of each pinnule lead to larger grooves on the main arm, like the currents binding to a river and continue to cross the calyx surface to the mouth.
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