A printable collection of starfish diagrams are available in this post for free! A variety of 101 Diagramss provided will help you in studying the structure of the anatomy of a starfish (also known as sea star). Starfish or sea stars are star-shaped echinoderms belonging to the class Asteroidea. Let’s start studying the anatomy of sea star and take a look at the following aboral starfish image below.
Starfish are marine invertebrates. They typically have a central disc and five arms, though some species have a larger number of arms. The aboral or upper surface may be smooth, granular or spiny (like shown in the starfish diagram above), and is covered with overlapping plates. Many species are brightly colored in various shades of red or orange, while others are blue, grey or brown. Starfish have tube feet operated by a hydraulic system and a mouth at the center of the oral or lower surface. For more detailed anatomy, take a look at the labeled diagrams below.
Most starfish have five arms that radiate from a central disc, but the number varies with the group. Some species have six or seven arms and others have 10–15 arms. Starfish do not have a circulatory system that can be described or put into parts. The skeleton of a starfish in indeed an endoskeleton and is inside of an outer covering just like the skeleton of a human. An echinoderm uses its spikes on the surface to take in oxygen in order for respiration to take place. It has a gill structure to take in the oxygen but overall the respiratory system is poorly developed.
Study about starfish anatomy by using these diagrams as your reference and resources. You can also find other animal anatomy-related diagrams in this site by looking through our archive or simply type the key word on the search column!