Are Starfish Vertebrates or Invertebrates? What Makes Them That Way?
Starfish, also known as sea stars, are fascinating marine creatures that have captivated the interest of scientists and nature enthusiasts alike. One of the fundamental questions that arises is whether they belong to the vertebrate or invertebrate category.
Starfish are classified as invertebrates. They lack a spinal column or backbone, which is the defining characteristic of vertebrates. Instead of a bony skeleton, they have a unique internal skeleton made of calcite plates that form a flexible frame.
In addition to the absence of a backbone, starfish also exhibit other characteristics that distinguish them from vertebrates. They have a decentralized nervous system, meaning they do not have a brain or a central nervous system. Instead, they have a network of nerves that run throughout their body, allowing them to respond to stimuli.
Starfish also have a water vascular system that helps them move and feed. This system consists of a series of water-filled canals and tube feet that extend from the central disc of their body. By manipulating the water flow within these structures, starfish can move slowly and capture prey.
In summary, starfish are invertebrates due to their lack of a backbone, decentralized nervous system, and water vascular system. These features set them apart from vertebrates, which typically have a bony skeleton, a central nervous system, and a circulatory system.
Related Questions:
- What is the scientific classification of starfish?
- What are the defining characteristics of vertebrates?
- How do starfish move?
- What type of nervous system do starfish have?
- Are starfish carnivores, herbivores, or omnivores?
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