- according to Hottinger (2006):
RETROVERT FORAMEN is a second, primary foramen located at the base of the marginal chamber suture, opening in a proximal direction and giving rise to orbitoidal growth after a spiral nepionic stage or to multiple spirals. Compare: supplementary apertures.
- marginal chamberlet
- orbitoidal growth
- primary foramen
- supplementary aperture
Hottinger (2006), Illustrated glossary of terms used in foraminiferal research. Carnets de Géologie, Memoir 2, ISSN 1634-0744.
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