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Fig. 1. Embryonic apparatus. A: Discocyclina, stereograph after Ferràndez (1999), modified. Schema, not to scale. achl: auxilliary chamberlet; ast: annular stolon; ecr: equatorial crest; il: inner lamella; lchl: lateral chamberlet; ol: outer lamella: ost(d): oblique stolon of deuteroconch; ost: oblique stolon; p: pore; pap: papilla; rst: radial stolon; rst(d): radial stolon of deuteroconch; (Hottinger, 2006; fig. 41 [1] CC/BY-NC-SA)


  • according to Hottinger (2006):

CORONA - first cycle of chamberlets enveloping an embryonal apparatus completely, at least in one plane of sectionning, as in Discocyclina.

Remarks: The term may be useful in biometry when describing the relation between the diameter of the embryonic apparatus and the number of chamberlets in the immediately succeeding growth stage. See also: periembryonic chamberlets.


Ferràndez I Cañadell (1999), Morfoestructura i paleobiologia dels Ortofragmínidos de la Mesogea (Discocyclinidae i Orbitocyclinidae, Foraminifera), Arxius de les Seccions de Ciències, Barcelona, (Secció de Ciències i Tecnologia), CXXI, 339 p.

Hottinger (2006), Illustrated glossary of terms used in foraminiferal research. Carnets de Géologie, Memoir 2, ISSN 1634-0744

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