Classes of Mesozoa

Mesozoa is a small and enigmatic phylum of animals that includes a relatively small number of species. As of my last knowledge update in September 2021, Mesozoa is divided into two classes:

  1. Rhombozoa (Class Rhombozoa):
    • Rhombozoans are microscopic parasitic organisms that are primarily found in the kidneys and reproductive organs of marine invertebrates, such as mollusks and flatworms.
    • They have a simple body plan with a few cells and are often considered one of the simplest multicellular organisms.
    • The class Rhombozoa includes the genera Dicyema and Dicyemennea.
  2. Orthonectida (Class Orthonectida):
    • Orthonectids are also microscopic parasites that inhabit the body cavities and tissues of marine invertebrates.
    • They have a more complex body plan compared to rhombozoans, consisting of layers of cells.
    • Orthonectids can be found in various marine hosts, including annelid worms and echinoderms.

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