Fig. 1. Countersepta. A-D: Amphistegina tuberculata Bermudez, Dominican Republic, Upper Miocene, SEM stereographs showing the split halves of a megalospheric shell. A: dorsal side in ventral view, B: ventral side in dorsal view, with details in C and D. E-G: Amphistegina lopeztrigoi Palmer, thin slides in transmitted light micrographs, Eocene, Florida. Generic and specific name are unclear and need revision. E: centered section perpendicular to the coiling axis; F: section perpendicular to the coiling axis located below the megalosphere; G: poorly centered axial section. cs: counterseptum; egh: eggholder; f: main foramen; pust: pustules covering successive faces; s: septum of main chambers; stc: stellar chamberlet; (Hottinger, 2006; fig. 33  CC/BY-NC-SA)
- according to Hottinger (2006):
GUTTER - in Amphisteginidae: the free end of the stellar septulum, folded anteriorly at an angle to the axis of coiling. May be identical with the counterseptum in New World amphisteginids.
Hottinger (2006), Illustrated glossary of terms used in foraminiferal research. Carnets de Géologie, Memoir 2, ISSN 1634-0744
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