1) Living fossil
Found on
https://www.crosswordclues.com/clue/monoplacophora
Monoplacophora, meaning `bearing one plate`, is a polyphyletic class of molluscs with a cap-like shell, living at the bottom of the deep sea. Extant representatives were unknown until 1952; previously they were known only from the fossil record. Although the shell of many monoplacophorans is limpet-like in shape, they are not gastropods and are .....
Found on
http://en.wikipedia.org/wiki/Monoplacophora
No exact match found.
