General account and affinities of ctenophora and rotifera?

Ctenophora, commonly known as comb jellies, are a phylum of marine animals. They are characterized by their transparent, gelatinous bodies and rows of cilia, or comb-like structures, that they use for locomotion. Ctenophores are found in oceans worldwide and are known for their bioluminescence, producing beautiful light displays.

Rotifera, or rotifers, are a phylum of microscopic, multicellular animals. They are found in freshwater environments, such as lakes and ponds, as well as in moist soil and marine habitats. Rotifers are known for their unique feeding apparatus called a corona, which consists of cilia that create a rotating motion to capture food particles.

Both ctenophores and rotifers are considered to be relatively simple animals in terms of their body structure and organization. They lack specialized organs and complex systems found in more advanced animals. However, they are both successful in their respective habitats and play important roles in their ecosystems.

In terms of affinities, ctenophores and rotifers are both considered to be part of the larger group of animals known as protostomes. Protostomes are characterized by their embryonic development, where the first opening that forms during gastrulation becomes the mouth. This is in contrast to deuterostomes, where the first opening becomes the anus.

Overall, ctenophores and rotifers are fascinating organisms that have unique adaptations and contribute to the diversity of life in aquatic environments.