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Shelly vs Aptychus - What's the difference?

shelly | aptychus |

As an adjective shelly

is composed of the shells of dead marine creatures.

As a noun aptychus is

a marine fossil consisting of a hard anatomical structure like a curved shelly plate, once part of the body of an ammonite.

shelly

English

Proper noun

(en proper noun)
  • , variant of Shelley.
  • transferred from the surname, mostly of persons born before 1930.
  • used since 1930s, variant of Shelley.

    • aptychus

    English

    Noun

    (wikipedia aptychus) (aptychi)
  • A marine fossil consisting of a hard anatomical structure like a curved shelly plate, once part of the body of an ammonite.

    • Related terms

    * anaptychus