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#MolluscMonday

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Some ammonites (for example, this Kosmoceras jasoni) crushed shell in shale for #molluscmonday displayed sexual dimorphism, where the female (macroconch) of the species was larger than the male (microconch). It is thought that this was so the female could accommodate a brood of eggs within the shell.
#ammonite from the Callovian ( Middle Jurassic )