juvenarium

Noun

juvenarium (plural juvenaria or juvenariums)

1. A shell or portion thereof of a foraminifer in the youngest stage of shell-building.
   • The earlier figure may be considered to represent this form, for the latter figure is an atypical specimen with multiple juvenaria.1959, Walter Leroy Moore, Pennsylvanian foraminifera from the Big Saline formation of the Llano uplift of Texas
   • Later on, the above three genera evolved until various levels of the Eocene in America with unchanged equatorial chamber build-up, but with the microspheric juvenariums becoming more and more simple.1987, Geologica Hungarica: Series palaeontologica - Volume 51, page 74