protoconch

== English == === Etymology === From proto- +‎ conch. === Noun === protoconch (plural protoconches or protoconchs) (zoology) The embryonic shell, or initial chamber, of ammonites and other cephalopods ==== Coordinate terms ==== teleoconch === References === “protoconch”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.