deuteroconch

noun

noun

Etymology From deutero- + conch.

Biology, Natural sciences, Zoology The second chamber of ammonites and other cephalopods

A microspheric nucleoconch does not have an obvious deuteroconch, and is followed by a spiral nepionic stage, no matter what the adult chamber arrangement may be.1954, Alan Hilder Smout, Lower Tertiary Foraminifera of the Qatar Peninsula, British Museum (Natural History), page 25:

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