- according to Hottinger (2006):
ANNULAR CANAL - free space in preseptal position between endo- and exoskeletal structures in spirocyclinids.
Remarks: Unrelated to canal systems in lamellar perforate foraminifera. The term should not be used but replaced by annular passage.
Hottinger (2006), Illustrated glossary of terms used in foraminiferal research. Carnets de Géologie, Memoir 2, ISSN 1634-0744
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