“Whether this resemblance indicates a close relationship between monoplacophorans and phyla exhibiting true metamerism is an open question.”

“For instance, many arthropods have lost extensive metamerism but still have remnants in the form of repeated organs.”

“Most provocative of all the Ediacaran forms are those exhibiting real or apparent metamerism.”

“In the vertebrates the metamere is evident in the embryonic stages and tends to disappear in the adults.”

“Any particular abdominal metamere usually consists of only two sclerites, the tergum and sternum.”

“The term somite is also used more generally to refer to a body segment, or metamere, of a segmented animal.”