Je was op zoek naar: annulus (Spaans - Engels)

cyprea annulus
cyprea annulus

se le conoce como anillo astronómico (annulus astronomicus), el nombre completo de este instrumento es anillo equinoccial universal.
it is known as the astronomic ring dial (annulus astronomicus), the complete name of this instrument is the universal equinoctial ring sundial.

1-4* the extent of the annulus and the function of the different parts of the sporangium of ferns in the dispersion of spores.
* the extent of the annulus and the function of the different parts of the sporangium of ferns in the dispersion of spores.

crecen en tamaño a través de adiciones al margen creando bandas de crecimiento estacional desigual llamados "annuli" (en singular, "annulus").
unlike ganoid scales, they grow in size through additions to the margin, and in some species create bands of uneven seasonal growth called annuli (singluar annulus).