This phylum includes five classes, all relevant to the acuarófilo: Class Crinoidea, the sea pinks and Comatulids, the Holothuroidea, or sea cucumbers, the Echinoidea, sea urchins, the Asteroidea, starfish and Ophiuroidea , the brittle. The sea pinks appeared millions of years ago and are virtually confined to great depths. They are like Comatulids but located on a stalk of axes, the same Comatulids are also located on a stalk when young and only released to go to adults. Like all other equidermos, have radial symmetry and a vascular system for seawater that provides hydraulic power to the tube feet, characteristic of phylum and used for locomotion and prey capture. Although they are beautiful, crinoids are very likely to break, alone or with help from other fish, crabs, etc., The tank. On the other hand, are filter feeders and therefore relatively easy to maintain.

Cucumbers or sea cucumbers are creatures, shaped rather uninteresting slug crawling along the bottom are ingesting debris, except Dendrochirotidae family that has bright colors and feeds on plankton. Several members are bright red or combination red and white, and blue with a ring of spectacular, long tentacles around the mouth. This ring can be hidden and grow very slowly later.

Sea urchins are nearly spherical and calcified, so that when you die your rigid skeleton remains. They feed primarily on carrion and algae, that is, are omnivores, progressing well in aquariums as long as sufficient food. Many of them have long spines with which they move, in addition to the ambulacral system. Others have very short spines, and other venomous spines. The sea urchin genus has thorns thick Heterocentrotus adapted to rough surfaces but can live well in the aquarium.

Starfish are the equity that is most often found in aquariums, but not everyone lives well in this ecosystem and many of them are dangerous predators. A typical star of five or more arms are fed predominantly molluscs in nature and, of course, in the aquarium, if you are at your fingertips. To do so sets its tube feet to both halves of the shell and exerts a constant force until the shellfish yields and opened slightly. At this time the star inserts its stomach into the shell and begins digestion. Other stars feed on debris, or are omnivorous and can be very destructive to the aquarium. An interesting case is the blue star, common in aquariums, Linckia laevigata, which can live for months or years without eating.

The brittle stars are very hard together, breaking very easily and hiding most of the time, but learning to emerge when there is food to them. However, many of the larger species are more resilient as Ophiarachnella and do not break so easily, have a chamber similar to the chandeliers, running a lot for the tank to catch their prey grasping firmly with one or more arms.

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