- according to Hottinger (2006):
TOOTHPLATE - (sipho; central pillar, pars auct.); a contorted plate running from an intercameral foramen to an aperture, and attached to both. It may be shaped to form a single, double or spiral fold (or "tongue") with a free, often serrated distal end and distally protruding into the aperture. A toothplate separates partly or completely the main chamber lumen from an axial space (adapertural depression) in post-embryonic stages. It protrudes with a free edge distally and adaxially into the aperture. Interconnected toothplates in low-trochospiral umbilicate shells may produce a primary spiral canal. A toothplate is never associated with a foliar or stellar chamberlets. The use of the term in low-trochospiral rotaliid forms is under discussion (see Revets, 1993).
Hottinger (2006), Illustrated glossary of terms used in foraminiferal research. Carnets de Géologie, Memoir 2, ISSN 1634-0744
Revets (1993), The foraminiferal toothplate, a review. Journal of Micropaleontology, London, vol. 12, part 2, p. 155-168.
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