Hydraulically driven tube feet do most of the work, which includes locomotion, adhesion, sensory detection, food capture and respiration. Sea stars are usually star-shaped or pentagonal. They have a set of calcareous plates embedded into the fleshy tissue of their body wall. The mouth is at the centre of the undersurface. When feeding, the seastar is able move its sack-like stomach out through the mouth and partly digests the food outside its body.
Common Eight-armed Sea Star , Patriella calcar. They do not have tube feet, ampullae or parapodia. Instead, they move by flapping their long arms. This is similar to a form of walking. Starfish and Brittle star appear to be similar in their external appearance, both being very colorful.
However, they belong to two different classes of Echinodermata: class Asteroidea and Ophiuroidea. The key difference between starfish and brittle star is the manner in which they move. Starfish uses tube feet to move whereas brittle star uses its long arms to move. Moreover, starfish have special features such as the presence of ampullae and parapodia whereas brittle star lacks those.
Hence, this is also a difference between starfish and brittle star. Furthermore, the digestive system is also a major difference between starfish and brittle star. That is; the starfish has a complete digestive system whereas the brittle star lacks a complete digestive system.
The below infographic presents more information regarding the difference between starfish and brittle star. Star fish and brittle star are exclusively marine echinoderms. The key difference between starfish and brittle star is the mode of movement; starfish uses tube feet for their movement whereas brittle star moves using their long arms.
Additionally, the starfish has a complete digestive system with both mouth and anus. In comparison, the brittle star only has a mouth and stomach; thus, their digestive system is incomplete. Also, starfish has short arms while brittle star has long arms.
Besides, both starfish and brittle star are colorful marine organisms that mainly depend on predation for their nutrients. Thus, this summarizes the difference between starfish and brittle star. Wilkin, Douglas, and Jennifer Blanchette. Brittle stars can be easily distinguished from sea stars by their bodies. This central disc contains a calcium carbonate skeleton and all of their internal organs.
It is also a key part of their ability to regrow their arms. They have skinnier and longer arms that are flexible and solid. Their arms can each grow to be 24 inches long. It is clear where their arms begin and end and where their central disk is.
Brittle stars do not use their water-based vascular system to move. Instead, they twist and bend their long arms to move which allows them to move more quickly than sea stars. They are seafloor ecosystem engineers, named for their role in reshaping sediment on the seafloor when they twist and coil their arms to move. Within the phylum Echinodermata , sea stars are in the class Asteroidea. Unlike brittle stars, sea stars lack a central part of the body. Instead, their arms connect at a single point that is central on their body.
Sea stars have thicker and more triangular arms which merge together at the center.
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