plakinid
Plakinids are a group of extinct marine invertebrates belonging to the phylum Placozoa. They are characterized by their flat, simple, gelatinous body plan and a lack of distinct tissues and organs. Plakinids are found in marine environments worldwide, often inhabiting the surface of algae, rocks, and other substrates in shallow to moderately deep waters. Their exact evolutionary relationships are still debated, but they are considered one of the simplest multicellular animals known.
These organisms typically measure a few millimeters across and possess a bilaterally symmetrical, amoeboid structure. The