Porifera and Cnidaria
Sponges exhibit asymmetry, meaning they lack any distinct symmetry. In contrast, organisms from phylum Cnidaria and Arthropoda typically exhibit radial symmetry (such as jellyfish) or bilateral symmetry (like butterflies), respectively, where body parts are arranged around a central axis or mirror images are present on either side of the body.
This type of symmetry is called bilateral symmetry. It means that an animal's body can be divided into two equal halves along a single plane, typically the midline, resulting in mirror images.
Bilateral symmetry. This means that the animal's body can be divided into two equal halves along a single plane.
Symmetry in animals is something that is very important. It is a big part of classification in animals. Nearly all multi-cellular organisms exhibit one or other type of symmetry such as radial or bilateral. For more on this see the source.
Bilateral symmetry enables faster movement compared to radial symmetry. Bilateral symmetry allows for a distinct head region and front-back orientation, which enables more efficient and streamlined movement in a specific direction. Radial symmetry, found in organisms like jellyfish, does not have a clear directionality and typically results in slower movements.
Most animals will have a high level of right to left symmetry, or "Reflection Symmetry". Note, the symmetry isn't perfect as many of the internal organs only have a single organ and are arranged in a non-symmetric fashion.
Butterflies belong to the Phyla or Phylum Arthropoda.
Sponges exhibit a type of symmetry known as asymmetry. Unlike many other animals, sponges do not have a defined shape or symmetry, as they can vary greatly in form and structure. Some sponges may exhibit a degree of radial symmetry, but overall, they lack the organized symmetry seen in more complex organisms.
Body symmetry is an adaptation to the habit of the animal. For example:Radial symmetry is advantageous in sessile or sedentary and more or less passively drifting animals (Phyla Cnideria and Ctenophora), because it enables them to develop appendages all around the mouth for capturing prey or gathering food from all sides. Their sensory and nervous coordination is also concentrated around mouth.Majority of animal phyla exhibit Bilateral symmetry.This type of symmetry is said to have evolved in those ancestral forms which started moving on ocean floor. A crawling animal is expected to encounter food with the advancing end. So mouth developed at the anterior end. The sensory organs and coordinating brain also developed near mouth at the front end, enabling the animals to sense or recognize edible or non-edible organisms.
One type of symmetry is rotation. The second type of symmetry is translation. The third type of symmetry is reflection.
Bilateral Symmetry
Bilateral symmetry
Bilateral Symmetry
Bilateral symmetry.
Bilateral symmetry.
Bilateral symmetry
Bilateral Symmetry