6/7/2023 0 Comments Starfish labeled microscope![]() The starfish also lack of blood, but they have an aquifer vascular system, which transports salty water through the madreporite towards their alimentary routes to absorb nutrients. The speed they can reach employing their arms, ranges between 10 and 14 cm per minute. In some circumstances, these arms perform displacing functions, since they can work as levers or as a traction system when they are on vertical surfaces. The starfish usually have 5 arms with ambulacral grooves, although there are also specimens with 20 arms.Įach arm is formed by an internal blister and an external podium or “feet”. Starfish lack of eyes and brain, but they do have one sensory tentacle at the end of each arm. ![]() In this sense we must point out that they exhibit radial symmetry, since their arms are arranged evenly in a circle around a central disc. There are wrong beliefs about this marine creature, since people usually think that they are harmful to other marine species.Īt first sight the starfish seem to have a simplex anatomy, although the morphologic structure of these creatures is quite complex in each detail.
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